Elementary School Science Quiz: Design Energy Conversion Device
20 questions · exam conditions
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Design Energy Conversion DeviceQuestion 1 of 20

For this design challenge, Chen must build a noisemaker for recess using spinning parts; which conversion changes motion energy into sound energy?

Use a battery and LED to change chemical energy into light energy.
Use a motor and wheels to change electrical energy into motion energy.
Use a crank to spin a ridged wheel that clicks a card to make sound.
Use a solar panel to store sunlight as heat energy in a metal spoon.
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Elementary School Science Quiz

Elementary School Science Quiz: Design Energy Conversion Device

Practice Design Energy Conversion Device in Elementary School Science with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Design Energy Conversion Device, giving you a quick way to practice the rules, question types, and explanations that matter most for Elementary School Science.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

All questions

Question 1

For this design challenge, Chen must build a noisemaker for recess using spinning parts; which conversion changes motion energy into sound energy?

  1. Use a battery and LED to change chemical energy into light energy.
  2. Use a motor and wheels to change electrical energy into motion energy.
  3. Use a crank to spin a ridged wheel that clicks a card to make sound. (correct answer)
  4. Use a solar panel to store sunlight as heat energy in a metal spoon.
Explanation: This question tests 4th grade ability to design devices that convert energy from one form to another (NGSS 4-PS3-4). Students must understand that effective designs require the right energy conversion to accomplish the goal. To design an energy conversion device: (1) Identify the goal (what should device do?), (2) Determine needed output energy (light, motion, heat, sound?), (3) Identify available input energy (solar, battery, motion, electrical?), (4) Select components that enable conversion (solar panel for light→electrical, motor for electrical→motion, LED for electrical→light), (5) Plan how energy flows through device (input→conversion component→output). The design must match: if goal is to produce light, output must be light energy. In this challenge, the goal is to build a noisemaker for recess using spinning parts. To accomplish this, the device needs to produce sound energy. The available input energy is motion from spinning. Therefore, the design should convert motion to sound using mechanical parts like a ridged wheel and card. For example, to make a noisemaker, need a crank to spin a wheel that clicks a card (motion→sound). Choice C is correct because it identifies the right energy conversion (motion to sound), includes appropriate components (crank, ridged wheel, card), and accomplishes the stated goal (noisemaker). This design would work because input motion energy goes into spinning the wheel which converts it to sound energy via clicking. This demonstrates understanding that design choices must enable the needed energy conversion. Choice B is incorrect because it suggests wrong conversion (electrical to motion), which produces motion instead of sound and requires electricity not mentioned. This error occurs when students don't match output to goal or think any energy conversion will work. The design must convert energy to the form needed for the goal - if we need sound, we must produce sound energy, not motion or light. To help students design energy conversion devices: Teach design process explicitly - (1) What's the goal? (2) What energy output do we need? (3) What energy input do we have? (4) What component converts between them? Create component reference chart: solar panel (light→electrical), battery (chemical→electrical), LED (electrical→light), motor (electrical→motion), speaker (electrical→sound). Practice matching: Given goal 'make light,' identify needed output (light), possible inputs (battery, solar, hand-crank), and conversion path (battery→electrical→LED→light). Build simple examples: battery+LED flashlight, solar+motor fan, hand-crank+LED light. Emphasize: Design must accomplish the goal by producing the right form of output energy using available input energy. Test designs to refine and improve.

Question 2

To create this device, Sofia must build a solar-powered spinner that converts light energy to motion energy and spins for 30 seconds outdoors using a small solar panel, motor, and craft materials. Which design would best solve this problem?

  1. Connect the solar panel to a motor so sunlight makes the spinner turn. (correct answer)
  2. Use a hand-crank generator to power an LED so motion makes light.
  3. Connect the solar panel directly to a bell so sunlight makes sound.
  4. Attach paper blades to a stick and wave it by hand to spin.
Explanation: This question tests 4th grade ability to design devices that convert energy from one form to another (NGSS 4-PS3-4). Students must understand that effective designs require the right energy conversion to accomplish the goal. To design an energy conversion device: (1) Identify the goal (what should device do?), (2) Determine needed output energy (light, motion, heat, sound?), (3) Identify available input energy (solar, battery, motion, electrical?), (4) Select components that enable conversion (solar panel for light→electrical, motor for electrical→motion, LED for electrical→light), (5) Plan how energy flows through device (input→conversion component→output). The design must match: if goal is to produce light, output must be light energy. In this challenge, the goal is to build a solar-powered spinner that spins outdoors. To accomplish this, the device needs to produce motion energy. The available input energy is light from sunlight. Therefore, the design should convert light to motion using a solar panel and motor. For example, to make a solar-powered fan, need solar panel (light→electrical) connected to motor (electrical→motion). Choice A is correct because it identifies the right energy conversion (light to motion), includes appropriate components (solar panel, motor), and accomplishes the stated goal (spinning the spinner). This design would work because input light energy goes into the solar panel which converts it to electrical, then to the motor for motion energy we need. This demonstrates understanding that design choices must enable the needed energy conversion. Choice C is incorrect because it suggests wrong conversion (light to sound) and produces sound instead of motion, missing the goal of spinning. This error occurs when students don't match output to goal or confuse which components enable which conversions. The design must convert energy to the form needed for the goal - if we need motion, we must produce motion energy, not sound or light. To help students design energy conversion devices: Teach design process explicitly - (1) What's the goal? (2) What energy output do we need? (3) What energy input do we have? (4) What component converts between them? Create component reference chart: solar panel (light→electrical), battery (chemical→electrical), LED (electrical→light), motor (electrical→motion), speaker (electrical→sound). Practice matching: Given goal 'make light,' identify needed output (light), possible inputs (battery, solar, hand-crank), and conversion path (battery→electrical→LED→light). Build simple examples: battery+LED flashlight, solar+motor fan, hand-crank+LED light. Emphasize: Design must accomplish the goal by producing the right form of output energy using available input energy. Test designs to refine and improve.

Question 3

For this design challenge, Yuki needs a battery-powered doorbell that makes a chime. The device must convert chemical energy in the battery into electrical energy, then into sound energy with a buzzer. She may use a battery, wires, a push button, and a buzzer, and it must be low voltage. What should be included in the device to convert electrical to sound?

  1. A motor and wheels to convert electrical energy into motion energy.
  2. A solar panel to convert light energy into electrical energy for charging.
  3. A buzzer connected to the battery through a push button and wires. (correct answer)
  4. A paper cone to make it look louder without using electrical energy.
Explanation: This question tests 4th grade ability to design devices that convert energy from one form to another (NGSS 4-PS3-4). Students must understand that effective designs require the right energy conversion to accomplish the goal. To design an energy conversion device: (1) Identify the goal (what should device do?), (2) Determine needed output energy (light, motion, heat, sound?), (3) Identify available input energy (solar, battery, motion, electrical?), (4) Select components that enable conversion (solar panel for light→electrical, motor for electrical→motion, LED for electrical→light), (5) Plan how energy flows through device (input→conversion component→output). The design must match: if goal is to produce sound, output must be sound energy. In this challenge, the goal is to build a battery-powered doorbell that makes a chime. To accomplish this, the device needs to produce sound energy. The available input energy is chemical energy in the battery converting to electrical. Therefore, the design should convert electrical to sound using a buzzer. For example, pressing the button completes circuit allowing electricity to flow from battery through wires to buzzer (electrical→sound) creating the doorbell chime. Choice C is correct because it identifies the right energy conversion (electrical to sound), includes appropriate components (battery, push button, wires, buzzer), and accomplishes the stated goal (make doorbell chime). This design would work because electrical energy from the battery flows through the push button when pressed, then the buzzer converts electrical to sound energy we need. This demonstrates understanding that design choices must enable the needed energy conversion. Choice A is incorrect because it suggests motor and wheels, which convert electrical to motion energy, not sound. This error occurs when students don't match the output energy to the goal - the problem requires a doorbell that chimes (sound), not something that moves (motion). The design must produce sound energy to accomplish the goal of making a doorbell. To help students design energy conversion devices: Teach design process explicitly - (1) What's the goal? (2) What energy output do we need? (3) What energy input do we have? (4) What component converts between them? Create component reference chart: buzzer (electrical→sound), motor (electrical→motion), LED (electrical→light), battery (chemical→electrical), push button (controls flow). Practice matching: Given goal 'doorbell chime,' identify needed output (sound), available input (battery electrical energy), and conversion path (battery→electrical→button→buzzer→sound). Build simple examples: battery+buzzer doorbell, battery+motor car, battery+LED flashlight. Emphasize: Design must accomplish the goal by producing the right form of output energy using available input energy. Test designs to refine and improve.

Question 4

For this design challenge, Carlos must build a hand-crank flashlight for a storm kit. The device must convert motion energy into electrical energy using a generator, then into light energy with an LED. Use only a hand crank, generator, LED, wires, and switch, and no sharp edges are allowed. Which design choice would help the device work better?

  1. Add a switch so the LED can be turned off to save energy. (correct answer)
  2. Remove the generator so turning the crank does not make electricity.
  3. Use a motor to make the crank spin without anyone turning it.
  4. Replace the LED with a wheel so the output becomes motion, not light.
Explanation: This question tests 4th grade ability to design devices that convert energy from one form to another (NGSS 4-PS3-4). Students must understand that effective designs require the right energy conversion to accomplish the goal. To design an energy conversion device: (1) Identify the goal (what should device do?), (2) Determine needed output energy (light, motion, heat, sound?), (3) Identify available input energy (solar, battery, motion, electrical?), (4) Select components that enable conversion (solar panel for light→electrical, motor for electrical→motion, LED for electrical→light), (5) Plan how energy flows through device (input→conversion component→output). The design must match: if goal is to produce light, output must be light energy. In this challenge, the goal is to build a hand-crank flashlight for a storm kit. To accomplish this, the device needs to produce light energy. The available input energy is motion from turning the crank. Therefore, the design should convert motion to electrical (using generator) then electrical to light (using LED). For example, hand-crank turns generator (motion→electrical), then LED converts electrical→light. Choice A is correct because it suggests adding a switch to control energy use, which improves the design by allowing users to turn off the LED when not needed, saving generated electrical energy. This design improvement helps because the switch controls when electrical energy flows to the LED, preventing waste and extending use time. This demonstrates understanding that good design includes controlling energy flow efficiently. Choice B is incorrect because removing the generator would break the energy conversion chain - without the generator, turning the crank cannot produce electrical energy needed for the LED. This error occurs when students don't understand each component's role in the conversion sequence. The design must include all components needed for the complete energy conversion path. To help students design energy conversion devices: Teach design process explicitly - (1) What's the goal? (2) What energy output do we need? (3) What energy input do we have? (4) What component converts between them? Create component reference chart: generator (motion→electrical), LED (electrical→light), switch (controls electrical flow), wires (conduct electrical). Practice matching: Given goal 'hand-crank flashlight,' identify needed output (light), available input (hand motion), and conversion path (crank→generator→electrical→LED→light). Build simple examples: hand-crank flashlight with switch, battery+LED light, solar+motor fan. Emphasize: Design must accomplish the goal by producing the right form of output energy using available input energy, and good designs include ways to control and conserve energy. Test designs in dark conditions to refine and improve.

Question 5

For this design challenge, Jamal must create a solar-powered spinner for the classroom window. The device must convert light energy from the Sun into electrical energy and then into motion energy to spin. Use only a small solar panel, motor, wires, and cardboard, and it must spin for 30 seconds. Which design would best solve this problem?

  1. Connect a solar panel to a motor so sunlight makes the motor spin. (correct answer)
  2. Attach a battery to an LED so chemical energy makes light.
  3. Use a hand crank to power an LED, converting motion into light.
  4. Tape a paper pinwheel to a stick so wind makes it spin.
Explanation: This question tests 4th grade ability to design devices that convert energy from one form to another (NGSS 4-PS3-4). Students must understand that effective designs require the right energy conversion to accomplish the goal. To design an energy conversion device: (1) Identify the goal (what should device do?), (2) Determine needed output energy (light, motion, heat, sound?), (3) Identify available input energy (solar, battery, motion, electrical?), (4) Select components that enable conversion (solar panel for light→electrical, motor for electrical→motion, LED for electrical→light), (5) Plan how energy flows through device (input→conversion component→output). The design must match: if goal is to produce motion, output must be motion energy. In this challenge, the goal is to create a solar-powered spinner for the classroom window. To accomplish this, the device needs to produce motion energy to spin. The available input energy is light from the Sun. Therefore, the design should convert light to electrical (using solar panel) then electrical to motion (using motor). For example, solar panel converts sunlight→electrical, then motor converts electrical→motion to spin cardboard. Choice A is correct because it identifies the right energy conversion (light to electrical to motion), includes appropriate components (solar panel for light→electrical and motor for electrical→motion), and accomplishes the stated goal (make something spin). This design would work because light energy from Sun goes into solar panel which converts it to electrical energy, then electrical flows to motor which converts it to motion energy we need for spinning. This demonstrates understanding that design choices must enable the needed energy conversion. Choice B is incorrect because it uses battery instead of solar power and produces light instead of motion. This error occurs when students don't match input source and output to goal - the challenge requires solar input and motion output, not battery input and light output. The design must convert energy from the specified source to the form needed for the goal. To help students design energy conversion devices: Teach design process explicitly - (1) What's the goal? (2) What energy output do we need? (3) What energy input do we have? (4) What component converts between them? Create component reference chart: solar panel (light→electrical), battery (chemical→electrical), LED (electrical→light), motor (electrical→motion), speaker (electrical→sound). Practice matching: Given goal 'make solar spinner,' identify needed output (motion), available input (sunlight), and conversion path (sun→solar panel→electrical→motor→motion). Build simple examples: solar-powered fan, battery+motor car, hand-crank+LED light. Emphasize: Design must accomplish the goal by producing the right form of output energy using available input energy. Test designs in sunlight to refine and improve.

Question 6

For this design challenge, Amir must build a small electric hand warmer for a cold classroom. The device must convert electrical energy from a battery pack into heat energy using a safe heating element. He may use low-voltage batteries, wires, a switch, and a heating strip, and it cannot get too hot. To accomplish the goal, the device must convert   energy to   energy.

  1. motion energy to light energy
  2. electrical energy to heat energy (correct answer)
  3. light energy to sound energy
  4. heat energy to electrical energy
Explanation: This question tests 4th grade ability to design devices that convert energy from one form to another (NGSS 4-PS3-4). Students must understand that effective designs require the right energy conversion to accomplish the goal. To design an energy conversion device: (1) Identify the goal (what should device do?), (2) Determine needed output energy (light, motion, heat, sound?), (3) Identify available input energy (solar, battery, motion, electrical?), (4) Select components that enable conversion (solar panel for light→electrical, motor for electrical→motion, LED for electrical→light), (5) Plan how energy flows through device (input→conversion component→output). The design must match: if goal is to produce heat, output must be heat energy. In this challenge, the goal is to build an electric hand warmer for a cold classroom. To accomplish this, the device needs to produce heat energy. The available input energy is electrical from a battery pack. Therefore, the design should convert electrical to heat using a heating element. For example, electricity flows from battery through heating strip, resistance in the strip converts electrical energy to heat energy that warms hands. Choice B is correct because it identifies the right energy conversion (electrical to heat), matching the components specified (battery provides electrical, heating element converts to heat), and accomplishes the stated goal (warm hands in cold classroom). This design would work because electrical energy from the battery flows through the heating element which converts it to heat energy we need. This demonstrates understanding that design choices must enable the needed energy conversion. Choice A is incorrect because it suggests motion to light conversion, which doesn't match either the input (electrical from battery) or output (heat for warming) needed. This error occurs when students randomly pair energy forms without considering the specific goal - the problem requires heat output to warm hands, not light or motion. The design must convert the available input (electrical) to the needed output (heat). To help students design energy conversion devices: Teach design process explicitly - (1) What's the goal? (2) What energy output do we need? (3) What energy input do we have? (4) What component converts between them? Create component reference chart: heating element (electrical→heat), LED (electrical→light), motor (electrical→motion), speaker (electrical→sound), battery (chemical→electrical). Practice matching: Given goal 'warm hands,' identify needed output (heat), available input (battery electrical energy), and conversion path (battery→electrical→heating element→heat). Build simple examples: battery+heating pad, battery+LED flashlight, battery+motor fan. Emphasize: Design must accomplish the goal by producing the right form of output energy using available input energy. Test designs to refine and improve.

Question 7

For this design challenge, Fatima will build a simple musical shaker for a school parade. The device must convert motion energy from shaking into sound energy using beads or beans in a container. She may use a paper cup, tape, and dried beans, and it must not spill. What energy conversion should this device use?

  1. Electrical energy to light energy using a battery and LED.
  2. Light energy to electrical energy using a solar panel and wires.
  3. Motion energy to sound energy using beans rattling inside a sealed cup. (correct answer)
  4. Chemical energy to motion energy using a battery and a motor.
Explanation: This question tests 4th grade ability to design devices that convert energy from one form to another (NGSS 4-PS3-4). Students must understand that effective designs require the right energy conversion to accomplish the goal. To design an energy conversion device: (1) Identify the goal (what should device do?), (2) Determine needed output energy (light, motion, heat, sound?), (3) Identify available input energy (solar, battery, motion, electrical?), (4) Select components that enable conversion (solar panel for light→electrical, motor for electrical→motion, LED for electrical→light), (5) Plan how energy flows through device (input→conversion component→output). The design must match: if goal is to produce sound, output must be sound energy. In this challenge, the goal is to build a musical shaker for a parade. To accomplish this, the device needs to produce sound energy. The available input energy is motion from shaking. Therefore, the design should convert motion to sound using beans rattling in a container. For example, shaking the cup causes beans to move and collide with cup walls and each other, converting motion energy directly into sound energy through vibrations. Choice C is correct because it identifies the right energy conversion (motion to sound), includes appropriate components (sealed cup with beans inside), and accomplishes the stated goal (make musical sounds for parade). This design would work because motion energy from shaking goes into moving the beans which collide and vibrate, directly converting to sound energy we need. This demonstrates understanding that design choices must enable the needed energy conversion. Choice A is incorrect because it suggests electrical to light conversion using battery and LED, which doesn't match the challenge requirements. This error occurs when students default to electrical devices without considering simpler mechanical solutions - the problem can be solved with direct motion-to-sound conversion without electricity. The design must use the available input (shaking motion) to produce the needed output (sound). To help students design energy conversion devices: Teach design process explicitly - (1) What's the goal? (2) What energy output do we need? (3) What energy input do we have? (4) What component converts between them? Create component reference chart: shaker/rattle (motion→sound directly), buzzer (electrical→sound), LED (electrical→light), motor (electrical→motion), battery (chemical→electrical). Practice matching: Given goal 'make parade noise,' identify needed output (sound), available input (shaking motion), and conversion path (shake→beans move→collisions→sound). Build simple examples: bean shaker, battery+buzzer bell, rubber band guitar. Emphasize: Design must accomplish the goal by producing the right form of output energy using available input energy. Test designs to refine and improve.

Question 8

For this design challenge, Maya must build a hand-crank flashlight for a power outage. The device must convert motion energy from turning the crank into electrical energy and then into light energy from an LED. She may use a small generator, LED, wires, and a switch, and it must fit in one hand. Which design would best solve this problem?

  1. Use a hand crank to spin a generator, sending electrical energy through wires to an LED. (correct answer)
  2. Use a solar panel to collect sunlight and power an LED inside the flashlight.
  3. Use the hand crank to shake a bell so motion energy becomes sound energy.
  4. Use wires and a switch only, so the LED lights without any energy source.
Explanation: This question tests 4th grade ability to design devices that convert energy from one form to another (NGSS 4-PS3-4). Students must understand that effective designs require the right energy conversion to accomplish the goal. To design an energy conversion device: (1) Identify the goal (what should device do?), (2) Determine needed output energy (light, motion, heat, sound?), (3) Identify available input energy (solar, battery, motion, electrical?), (4) Select components that enable conversion (solar panel for light→electrical, motor for electrical→motion, LED for electrical→light), (5) Plan how energy flows through device (input→conversion component→output). The design must match: if goal is to produce light, output must be light energy. In this challenge, the goal is to build a hand-crank flashlight for power outages. To accomplish this, the device needs to produce light energy. The available input energy is motion from turning the hand crank. Therefore, the design should convert motion to electrical using a generator, then electrical to light using an LED. For example, turning the crank spins the generator (motion→electrical), electricity flows through wires to LED (electrical→light). Choice A is correct because it identifies the right energy conversion (motion to electrical to light), includes appropriate components (hand crank, generator, wires, LED), and accomplishes the stated goal (produce light during power outage). This design would work because motion energy from cranking goes into the generator which converts it to electrical energy, then the LED converts electrical to light energy we need. This demonstrates understanding that design choices must enable the needed energy conversion. Choice B is incorrect because it suggests using a solar panel, which converts light to electrical, not motion to electrical. This error occurs when students don't match the input energy source to the challenge requirements - the problem specifies a hand-crank flashlight, not solar-powered. The design must use the specified input energy (motion from cranking) to produce the needed output (light). To help students design energy conversion devices: Teach design process explicitly - (1) What's the goal? (2) What energy output do we need? (3) What energy input do we have? (4) What component converts between them? Create component reference chart: generator (motion→electrical), solar panel (light→electrical), battery (chemical→electrical), LED (electrical→light), motor (electrical→motion), speaker (electrical→sound). Practice matching: Given goal 'make emergency light,' identify needed output (light), available input (hand crank motion), and conversion path (crank→generator→electrical→LED→light). Build simple examples: hand-crank flashlight, battery+LED light, solar+motor fan. Emphasize: Design must accomplish the goal by producing the right form of output energy using available input energy. Test designs to refine and improve.

Question 9

For this design challenge, Diego needs a hand-crank camping light that works without batteries. The device must convert motion energy from cranking into electrical energy and then into light energy. He may use a generator, LED, wires, and a switch, and it must light for 2 minutes. How should the device be designed to convert energy effectively?

  1. Use a solar panel to charge a battery, then power an LED at night.
  2. Use a crank to spin a generator, then connect wires from generator to LED. (correct answer)
  3. Use a crank to spin a fan blade, so motion energy becomes more motion energy.
  4. Use only a switch and wires, so the LED lights up by itself.
Explanation: This question tests 4th grade ability to design devices that convert energy from one form to another (NGSS 4-PS3-4). Students must understand that effective designs require the right energy conversion to accomplish the goal. To design an energy conversion device: (1) Identify the goal (what should device do?), (2) Determine needed output energy (light, motion, heat, sound?), (3) Identify available input energy (solar, battery, motion, electrical?), (4) Select components that enable conversion (solar panel for light→electrical, motor for electrical→motion, LED for electrical→light), (5) Plan how energy flows through device (input→conversion component→output). The design must match: if goal is to produce light, output must be light energy. In this challenge, the goal is to build a hand-crank camping light that works without batteries. To accomplish this, the device needs to produce light energy. The available input energy is motion from cranking. Therefore, the design should convert motion to electrical using a generator, then electrical to light using an LED. For example, turning the crank spins the generator (motion→electrical), electricity flows through wires to LED (electrical→light) providing camping illumination. Choice B is correct because it identifies the right energy conversion (motion to electrical to light), includes appropriate components (crank, generator, wires, LED), and accomplishes the stated goal (produce light without batteries). This design would work because motion energy from cranking goes into the generator which converts it to electrical energy, then the LED converts electrical to light energy we need. This demonstrates understanding that design choices must enable the needed energy conversion. Choice C is incorrect because it suggests using a crank to spin a fan blade, which keeps energy as motion rather than converting to light. This error occurs when students don't understand that energy must change forms - the problem requires light output, so motion must be converted to electrical then to light, not stay as motion. The design must convert motion input to light output to accomplish the goal. To help students design energy conversion devices: Teach design process explicitly - (1) What's the goal? (2) What energy output do we need? (3) What energy input do we have? (4) What component converts between them? Create component reference chart: generator (motion→electrical), motor (electrical→motion), LED (electrical→light), battery (chemical→electrical), solar panel (light→electrical). Practice matching: Given goal 'make light without batteries,' identify needed output (light), available input (hand crank motion), and conversion path (crank→generator→electrical→LED→light). Build simple examples: hand-crank flashlight, battery+LED lantern, solar+motor fan. Emphasize: Design must accomplish the goal by producing the right form of output energy using available input energy. Test designs to refine and improve.

Question 10

When designing this device, Yuki must build a hand-crank light that fits in one hand; which design choice would help it work better?

  1. Add a switch and tight wire connections so electrical energy reaches the LED. (correct answer)
  2. Make the handle shorter so it is harder to turn and generates less energy.
  3. Remove the LED and use only plastic to keep the device lightweight.
  4. Paint it brighter colors so it looks like it is producing more light.
Explanation: This question tests 4th grade ability to design devices that convert energy from one form to another (NGSS 4-PS3-4). Students must understand that effective designs require the right energy conversion to accomplish the goal. To design an energy conversion device: (1) Identify the goal (what should device do?), (2) Determine needed output energy (light, motion, heat, sound?), (3) Identify available input energy (solar, battery, motion, electrical?), (4) Select components that enable conversion (solar panel for light→electrical, motor for electrical→motion, LED for electrical→light), (5) Plan how energy flows through device (input→conversion component→output). The design must match: if goal is to produce light, output must be light energy. In this challenge, the goal is to build a hand-crank light that fits in one hand. To accomplish this, the device needs to produce light energy efficiently. The available input energy is motion from hand-crank. Therefore, the design should convert motion to light using generator and LED, with good connections. For example, to make a compact light, need hand-crank (motion→electrical) to LED (electrical→light) with switch and tight wires. Choice A is correct because it identifies the right energy conversion (improving flow for motion to light), includes appropriate components (switch, tight wires), and accomplishes the stated goal (better working light). This design would work because good connections ensure input motion energy converts to electrical and reaches the LED for light. This demonstrates understanding that design choices must enable the needed energy conversion. Choice B is incorrect because it suggests making it harder to turn (shorter handle), which generates less energy and worsens performance. This error occurs when students don't understand energy flow or think difficulty improves output. The design must convert energy to the form needed for the goal - if we need light, we must ensure efficient flow to produce light energy. To help students design energy conversion devices: Teach design process explicitly - (1) What's the goal? (2) What energy output do we need? (3) What energy input do we have? (4) What component converts between them? Create component reference chart: solar panel (light→electrical), battery (chemical→electrical), LED (electrical→light), motor (electrical→motion), speaker (electrical→sound). Practice matching: Given goal 'make light,' identify needed output (light), possible inputs (battery, solar, hand-crank), and conversion path (battery→electrical→LED→light). Build simple examples: battery+LED flashlight, solar+motor fan, hand-crank+LED light. Emphasize: Design must accomplish the goal by producing the right form of output energy using available input energy. Test designs to refine and improve.

Question 11

For this design challenge, Diego must build a battery-powered lantern that is safe and portable; what should be included to convert chemical energy to light energy?

  1. A solar panel and motor to convert sunlight into spinning motion.
  2. A battery, wires, switch, and LED to convert chemical energy into light. (correct answer)
  3. A hand-crank and generator to convert motion energy into stored chemical energy.
  4. Cardboard, markers, and tape to make it bright without electricity.
Explanation: This question tests 4th grade ability to design devices that convert energy from one form to another (NGSS 4-PS3-4). Students must understand that effective designs require the right energy conversion to accomplish the goal. To design an energy conversion device: (1) Identify the goal (what should device do?), (2) Determine needed output energy (light, motion, heat, sound?), (3) Identify available input energy (solar, battery, motion, electrical?), (4) Select components that enable conversion (solar panel for light→electrical, motor for electrical→motion, LED for electrical→light), (5) Plan how energy flows through device (input→conversion component→output). The design must match: if goal is to produce light, output must be light energy. In this challenge, the goal is to build a battery-powered lantern that is safe and portable. To accomplish this, the device needs to produce light energy. The available input energy is chemical from the battery. Therefore, the design should convert chemical to light using a battery and LED. For example, to make a lantern, need battery (chemical→electrical) connected to LED (electrical→light). Choice B is correct because it identifies the right energy conversion (chemical to light), includes appropriate components (battery, wires, switch, LED), and accomplishes the stated goal (safe portable light). This design would work because input chemical energy goes into the battery which converts to electrical, then to LED for light energy we need. This demonstrates understanding that design choices must enable the needed energy conversion. Choice D is incorrect because it suggests no conversion (just cardboard without electricity), which can't produce light. This error occurs when students focus on appearance not function or don't understand which components enable conversions. The design must convert energy to the form needed for the goal - if we need light, we must produce light energy, not just a shape. To help students design energy conversion devices: Teach design process explicitly - (1) What's the goal? (2) What energy output do we need? (3) What energy input do we have? (4) What component converts between them? Create component reference chart: solar panel (light→electrical), battery (chemical→electrical), LED (electrical→light), motor (electrical→motion), speaker (electrical→sound). Practice matching: Given goal 'make light,' identify needed output (light), possible inputs (battery, solar, hand-crank), and conversion path (battery→electrical→LED→light). Build simple examples: battery+LED flashlight, solar+motor fan, hand-crank+LED light. Emphasize: Design must accomplish the goal by producing the right form of output energy using available input energy. Test designs to refine and improve.

Question 12

To create this device, Diego must design a simple speaker box that converts electrical energy to sound energy using a battery, wires, switch, and small speaker, and it must be safe and portable. What is the main energy conversion in this device?

  1. Electrical energy changes into sound energy when the speaker vibrates. (correct answer)
  2. Sound energy changes into electrical energy inside the battery.
  3. Chemical energy changes into heat energy by rubbing the speaker cone.
  4. Light energy changes into motion energy when the switch is flipped.
Explanation: This question tests 4th grade ability to design devices that convert energy from one form to another (NGSS 4-PS3-4). Students must understand that effective designs require the right energy conversion to accomplish the goal. To design an energy conversion device: (1) Identify the goal (what should device do?), (2) Determine needed output energy (light, motion, heat, sound?), (3) Identify available input energy (solar, battery, motion, electrical?), (4) Select components that enable conversion (solar panel for light→electrical, motor for electrical→motion, LED for electrical→light), (5) Plan how energy flows through device (input→conversion component→output). The design must match: if goal is to produce light, output must be light energy. In this challenge, the goal is to design a simple speaker box that produces sound. To accomplish this, the device needs to produce sound energy. The available input energy is electrical from the battery. Therefore, the design should convert electrical to sound using a battery and speaker. For example, to make a battery-powered speaker, need battery (chemical→electrical) connected to speaker (electrical→sound). Choice A is correct because it identifies the right energy conversion (electrical to sound), matches the components (battery, speaker), and accomplishes the stated goal (producing sound). This design would work because input electrical energy goes into the speaker which converts it to sound energy we need. This demonstrates understanding that design choices must enable the needed energy conversion. Choice B is incorrect because it reverses the conversion (sound to electrical), which doesn't produce sound from electrical input. This error occurs when students reverse input and output or don't understand the direction of conversion. The design must convert energy to the form needed for the goal - if we need sound, we must produce sound energy, not electrical or heat. To help students design energy conversion devices: Teach design process explicitly - (1) What's the goal? (2) What energy output do we need? (3) What energy input do we have? (4) What component converts between them? Create component reference chart: solar panel (light→electrical), battery (chemical→electrical), LED (electrical→light), motor (electrical→motion), speaker (electrical→sound). Practice matching: Given goal 'make light,' identify needed output (light), possible inputs (battery, solar, hand-crank), and conversion path (battery→electrical→LED→light). Build simple examples: battery+LED flashlight, solar+motor fan, hand-crank+LED light. Emphasize: Design must accomplish the goal by producing the right form of output energy using available input energy. Test designs to refine and improve.

Question 13

To create this device, Yuki must design a solar-powered outdoor night light that converts light energy to electrical energy and then to light energy using a solar panel, rechargeable battery, LED, and switch, and it must be weather-safe. What should be included in the device to convert light to electrical energy?

  1. A solar panel connected by wires to store energy in a rechargeable battery. (correct answer)
  2. A motor connected to wheels so sunlight makes the device roll away.
  3. A hand-crank generator so pushing it makes electricity from motion.
  4. A paper shade that makes the LED look brighter without more energy.
Explanation: This question tests 4th grade ability to design devices that convert energy from one form to another (NGSS 4-PS3-4). Students must understand that effective designs require the right energy conversion to accomplish the goal. To design an energy conversion device: (1) Identify the goal (what should device do?), (2) Determine needed output energy (light, motion, heat, sound?), (3) Identify available input energy (solar, battery, motion, electrical?), (4) Select components that enable conversion (solar panel for light→electrical, motor for electrical→motion, LED for electrical→light), (5) Plan how energy flows through device (input→conversion component→output). The design must match: if goal is to produce light, output must be light energy. In this challenge, the goal is to design a solar-powered outdoor night light that provides light at night. To accomplish this, the device needs to produce light energy (from stored electrical). The available input energy is light from the sun. Therefore, the design should convert light to electrical using a solar panel and battery. For example, to make a solar night light, need solar panel (light→electrical) connected to battery (stores electrical) then to LED (electrical→light). Choice A is correct because it identifies the right energy conversion (light to electrical), includes appropriate components (solar panel, rechargeable battery), and accomplishes the stated goal (storing energy for later light). This design would work because input light energy goes into the solar panel which converts it to electrical energy we need for storage. This demonstrates understanding that design choices must enable the needed energy conversion. Choice B is incorrect because it suggests conversion to motion (wheels rolling) instead of storing for light, missing the goal of night lighting. This error occurs when students don't match output to goal or focus on appearance not function. The design must convert energy to the form needed for the goal - if we need stored electrical for light, we must produce electrical energy, not motion or sound. To help students design energy conversion devices: Teach design process explicitly - (1) What's the goal? (2) What energy output do we need? (3) What energy input do we have? (4) What component converts between them? Create component reference chart: solar panel (light→electrical), battery (chemical→electrical), LED (electrical→light), motor (electrical→motion), speaker (electrical→sound). Practice matching: Given goal 'make light,' identify needed output (light), possible inputs (battery, solar, hand-crank), and conversion path (battery→electrical→LED→light). Build simple examples: battery+LED flashlight, solar+motor fan, hand-crank+LED light. Emphasize: Design must accomplish the goal by producing the right form of output energy using available input energy. Test designs to refine and improve.

Question 14

To create this device, Maya must design an electric hand warmer that converts electrical energy to heat energy and warms a small metal plate safely for 3 minutes using low-voltage batteries, wires, a switch, and a heating element. What energy conversion should this device use?

  1. Electrical energy to heat energy using a heating element controlled by a switch. (correct answer)
  2. Heat energy to electrical energy by placing the plate in cold air.
  3. Electrical energy to motion energy by spinning a motor to feel warm.
  4. Light energy to heat energy using only paper and tape indoors.
Explanation: This question tests 4th grade ability to design devices that convert energy from one form to another (NGSS 4-PS3-4). Students must understand that effective designs require the right energy conversion to accomplish the goal. To design an energy conversion device: (1) Identify the goal (what should device do?), (2) Determine needed output energy (light, motion, heat, sound?), (3) Identify available input energy (solar, battery, motion, electrical?), (4) Select components that enable conversion (solar panel for light→electrical, motor for electrical→motion, LED for electrical→light), (5) Plan how energy flows through device (input→conversion component→output). The design must match: if goal is to produce light, output must be light energy. In this challenge, the goal is to design an electric hand warmer that warms a plate. To accomplish this, the device needs to produce heat energy. The available input energy is electrical from batteries. Therefore, the design should convert electrical to heat using batteries and a heating element. For example, to make a battery-powered warmer, need battery (chemical→electrical) connected to heating element (electrical→heat). Choice A is correct because it identifies the right energy conversion (electrical to heat), includes appropriate components (heating element, switch), and accomplishes the stated goal (warming safely). This design would work because input electrical energy goes into the heating element which converts it to heat energy we need. This demonstrates understanding that design choices must enable the needed energy conversion. Choice D is incorrect because it suggests wrong conversion (light to heat) using only paper and tape, which can't effectively convert or produce heat indoors without proper components. This error occurs when students focus on appearance not function or don't understand which components enable which conversions. The design must convert energy to the form needed for the goal - if we need heat, we must produce heat energy, not light or motion. To help students design energy conversion devices: Teach design process explicitly - (1) What's the goal? (2) What energy output do we need? (3) What energy input do we have? (4) What component converts between them? Create component reference chart: solar panel (light→electrical), battery (chemical→electrical), LED (electrical→light), motor (electrical→motion), speaker (electrical→sound). Practice matching: Given goal 'make light,' identify needed output (light), possible inputs (battery, solar, hand-crank), and conversion path (battery→electrical→LED→light). Build simple examples: battery+LED flashlight, solar+motor fan, hand-crank+LED light. Emphasize: Design must accomplish the goal by producing the right form of output energy using available input energy. Test designs to refine and improve.

Question 15

For this design challenge, students need light during a power outage; build a hand-crank flashlight that converts motion energy to light energy and stays on for 2 minutes using only a hand-crank generator, LED, wires, and a switch with no sharp edges. What should be included in the device to convert motion to light?

  1. Use a hand-crank generator connected by wires to an LED and a switch to make light. (correct answer)
  2. Use a solar panel to power a motor that spins a fan to make light.
  3. Use a battery and a motor so the device converts chemical energy to motion energy.
  4. Use cardboard decorations and tape so the flashlight looks bright without lighting up.
Explanation: This question tests 4th grade ability to design devices that convert energy from one form to another (NGSS 4-PS3-4). Students must understand that effective designs require the right energy conversion to accomplish the goal. To design an energy conversion device: (1) Identify the goal (what should device do?), (2) Determine needed output energy (light, motion, heat, sound?), (3) Identify available input energy (solar, battery, motion, electrical?), (4) Select components that enable conversion (solar panel for light→electrical, motor for electrical→motion, LED for electrical→light), (5) Plan how energy flows through device (input→conversion component→output). The design must match: if goal is to produce light, output must be light energy. In this challenge, the goal is to build a hand-crank flashlight for light during a power outage. To accomplish this, the device needs to produce light energy. The available input energy is motion from hand-cranking. Therefore, the design should convert motion to light using a generator and LED. For example, to make a hand-crank flashlight, need a generator (motion→electrical) connected to an LED (electrical→light). Choice A is correct because it identifies the right energy conversion (motion to light), includes appropriate components (hand-crank generator, LED, wires, switch), and accomplishes the stated goal (producing light). This design would work because input motion energy goes into the generator which converts it to electrical, then to the LED for light energy we need. This demonstrates understanding that design choices must enable the needed energy conversion. Choice B is incorrect because it suggests wrong conversion (light to motion) and produces motion instead of light, missing the goal of making light. This error occurs when students confuse input and output or don't match output to goal. The design must convert energy to the form needed for the goal - if we need light, we must produce light energy, not sound or motion. To help students design energy conversion devices: Teach design process explicitly - (1) What's the goal? (2) What energy output do we need? (3) What energy input do we have? (4) What component converts between them? Create component reference chart: solar panel (light→electrical), battery (chemical→electrical), LED (electrical→light), motor (electrical→motion), speaker (electrical→sound). Practice matching: Given goal 'make light,' identify needed output (light), possible inputs (battery, solar, hand-crank), and conversion path (battery→electrical→LED→light). Build simple examples: battery+LED flashlight, solar+motor fan, hand-crank+LED light. Emphasize: Design must accomplish the goal by producing the right form of output energy using available input energy. Test designs to refine and improve.

Question 16

For this design challenge, Marcus must build a small solar-powered night light for a hallway. The device must convert light energy from the Sun into electrical energy using a solar panel to charge a battery, then power an LED at night. He may use a solar panel, rechargeable battery, LED, and wires, and it must be safe. Which design choice would help the device work better?

  1. Point the solar panel toward a sunny window to collect more light energy. (correct answer)
  2. Cover the solar panel with paper so it stays clean and shaded.
  3. Replace the LED with a small bell so the device makes sound instead.
  4. Remove the battery so the light can still work all night.
Explanation: This question tests 4th grade ability to design devices that convert energy from one form to another (NGSS 4-PS3-4). Students must understand that effective designs require the right energy conversion to accomplish the goal. To design an energy conversion device: (1) Identify the goal (what should device do?), (2) Determine needed output energy (light, motion, heat, sound?), (3) Identify available input energy (solar, battery, motion, electrical?), (4) Select components that enable conversion (solar panel for light→electrical, motor for electrical→motion, LED for electrical→light), (5) Plan how energy flows through device (input→conversion component→output). The design must match: if goal is to produce light, output must be light energy. In this challenge, the goal is to build a solar-powered night light. To accomplish this, the device needs to produce light energy at night using energy collected during the day. The available input energy is light from the Sun. Therefore, the design should convert light to electrical using a solar panel to charge a battery, then electrical to light using an LED at night. For example, sunlight hits solar panel during day (light→electrical), charges battery (electrical→chemical storage), then battery powers LED at night (chemical→electrical→light). Choice A is correct because it identifies a key design improvement - pointing the solar panel toward sunny window maximizes light energy collection. This design choice would work better because more sunlight hitting the panel means more electrical energy generated to charge the battery, providing more power for the LED at night. This demonstrates understanding that design effectiveness depends on optimizing energy input. Choice B is incorrect because covering the solar panel blocks light, preventing energy conversion. This error occurs when students don't understand that solar panels need direct sunlight to work - shading or covering them stops the light-to-electrical conversion. The design must allow maximum light to reach the solar panel for effective energy collection. To help students design energy conversion devices: Teach design process explicitly - (1) What's the goal? (2) What energy output do we need? (3) What energy input do we have? (4) What component converts between them? Create component reference chart: solar panel (light→electrical), battery (chemical↔electrical for storage), LED (electrical→light), pointing toward sun (maximizes input). Practice matching: Given goal 'night light using solar,' identify conversions (day: sun→solar panel→electrical→battery storage; night: battery→electrical→LED→light). Build simple examples: solar calculator, solar garden light, battery backup systems. Emphasize: Design must accomplish the goal by producing the right form of output energy using available input energy. Test designs to refine and improve positioning and components.

Question 17

For this design challenge, Jamal will build a solar-powered pinwheel that spins outside a window. The device must convert light energy from the Sun into electrical energy and then into motion energy using a motor. He may use a small solar panel, motor, wires, and a pinwheel, and it must be safe. What should be included to convert light to motion?

  1. A battery and LED to convert chemical energy into light energy for a lamp.
  2. A solar panel connected by wires to a motor that turns the pinwheel. (correct answer)
  3. A hand crank and generator to convert motion energy into electrical energy.
  4. A speaker connected to wires to convert electrical energy into sound energy.
Explanation: This question tests 4th grade ability to design devices that convert energy from one form to another (NGSS 4-PS3-4). Students must understand that effective designs require the right energy conversion to accomplish the goal. To design an energy conversion device: (1) Identify the goal (what should device do?), (2) Determine needed output energy (light, motion, heat, sound?), (3) Identify available input energy (solar, battery, motion, electrical?), (4) Select components that enable conversion (solar panel for light→electrical, motor for electrical→motion, LED for electrical→light), (5) Plan how energy flows through device (input→conversion component→output). The design must match: if goal is to produce motion, output must be motion energy. In this challenge, the goal is to build a solar-powered pinwheel that spins. To accomplish this, the device needs to produce motion energy to turn the pinwheel. The available input energy is light from the Sun. Therefore, the design should convert light to electrical using a solar panel, then electrical to motion using a motor. For example, sunlight hits solar panel (light→electrical), electricity flows through wires to motor (electrical→motion) which spins the pinwheel. Choice B is correct because it identifies the right energy conversion (light to electrical to motion), includes appropriate components (solar panel, wires, motor), and accomplishes the stated goal (make pinwheel spin). This design would work because light energy from the Sun goes into the solar panel which converts it to electrical energy, then the motor converts electrical to motion energy we need. This demonstrates understanding that design choices must enable the needed energy conversion. Choice C is incorrect because it suggests using a hand crank and generator, which converts motion to electrical, not light to motion. This error occurs when students focus on familiar components without matching them to the specific energy source - the problem specifies solar-powered, requiring light as input, not hand motion. The design must use the specified input energy (sunlight) to produce the needed output (motion). To help students design energy conversion devices: Teach design process explicitly - (1) What's the goal? (2) What energy output do we need? (3) What energy input do we have? (4) What component converts between them? Create component reference chart: solar panel (light→electrical), battery (chemical→electrical), LED (electrical→light), motor (electrical→motion), generator (motion→electrical), speaker (electrical→sound). Practice matching: Given goal 'make pinwheel spin using sunlight,' identify needed output (motion), available input (light), and conversion path (sun→solar panel→electrical→motor→motion). Build simple examples: solar-powered fan, battery+motor car, hand-crank+generator light. Emphasize: Design must accomplish the goal by producing the right form of output energy using available input energy. Test designs to refine and improve.

Question 18

For this design challenge, Sofia needs a battery-powered lantern for a camping trip at night. The device must convert chemical energy in the battery into electrical energy and then into light energy from an LED. She may use a battery pack, LED, wires, and a switch, and it must be low voltage. What is the main energy conversion in this device?

  1. Light energy to motion energy using a solar panel and a motor.
  2. Motion energy to electrical energy using a hand crank and generator.
  3. Chemical energy to electrical energy to light energy using a battery and LED. (correct answer)
  4. Electrical energy to sound energy using wires connected to a speaker.
Explanation: This question tests 4th grade ability to design devices that convert energy from one form to another (NGSS 4-PS3-4). Students must understand that effective designs require the right energy conversion to accomplish the goal. To design an energy conversion device: (1) Identify the goal (what should device do?), (2) Determine needed output energy (light, motion, heat, sound?), (3) Identify available input energy (solar, battery, motion, electrical?), (4) Select components that enable conversion (solar panel for light→electrical, motor for electrical→motion, LED for electrical→light), (5) Plan how energy flows through device (input→conversion component→output). The design must match: if goal is to produce light, output must be light energy. In this challenge, the goal is to build a battery-powered lantern for camping at night. To accomplish this, the device needs to produce light energy. The available input energy is chemical energy stored in the battery. Therefore, the design should convert chemical to electrical as the battery releases energy, then electrical to light using an LED. For example, battery releases stored energy (chemical→electrical), electricity flows through wires to LED (electrical→light) for camping illumination. Choice C is correct because it identifies the right energy conversion (chemical to electrical to light), includes appropriate components (battery pack, wires, LED), and accomplishes the stated goal (produce light for nighttime camping). This design would work because chemical energy stored in the battery converts to electrical energy when connected in a circuit, then the LED converts electrical to light energy we need. This demonstrates understanding that design choices must enable the needed energy conversion. Choice B is incorrect because it suggests motion to electrical conversion using a hand crank and generator, which doesn't match the specified battery-powered requirement. This error occurs when students confuse different energy sources - the problem specifies battery-powered, meaning chemical energy is the input, not motion energy. The design must use the specified input energy (chemical in battery) to produce the needed output (light). To help students design energy conversion devices: Teach design process explicitly - (1) What's the goal? (2) What energy output do we need? (3) What energy input do we have? (4) What component converts between them? Create component reference chart: battery (chemical→electrical), solar panel (light→electrical), LED (electrical→light), motor (electrical→motion), generator (motion→electrical), speaker (electrical→sound). Practice matching: Given goal 'make camping light,' identify needed output (light), available input (battery chemical energy), and conversion path (battery→electrical→LED→light). Build simple examples: battery+LED flashlight, solar+motor fan, hand-crank+generator radio. Emphasize: Design must accomplish the goal by producing the right form of output energy using available input energy. Test designs to refine and improve.

Question 19

For this design challenge, Chen must build a small alarm that beeps when a button is pressed. The device must convert electrical energy from a battery into sound energy using a buzzer or speaker. He may use a battery, wires, a switch, and a buzzer, and it must be safe. Which design choice would help the device work better?

  1. Add a buzzer connected to the battery through a switch to make sound. (correct answer)
  2. Add a solar panel so the device only works in bright sunlight.
  3. Remove the wires so electricity cannot reach the buzzer or switch.
  4. Use a motor to spin a wheel instead of making any sound.
Explanation: This question tests 4th grade ability to design devices that convert energy from one form to another (NGSS 4-PS3-4). Students must understand that effective designs require the right energy conversion to accomplish the goal. To design an energy conversion device: (1) Identify the goal (what should device do?), (2) Determine needed output energy (light, motion, heat, sound?), (3) Identify available input energy (solar, battery, motion, electrical?), (4) Select components that enable conversion (solar panel for light→electrical, motor for electrical→motion, LED for electrical→light), (5) Plan how energy flows through device (input→conversion component→output). The design must match: if goal is to produce sound, output must be sound energy. In this challenge, the goal is to build an alarm that beeps when a button is pressed. To accomplish this, the device needs to produce sound energy. The available input energy is electrical from a battery. Therefore, the design should convert electrical to sound using a buzzer. For example, pressing the button completes the circuit, allowing electricity to flow from battery through wires to buzzer (electrical→sound) creating the beep. Choice A is correct because it identifies the right energy conversion (electrical to sound), includes appropriate components (battery, switch, buzzer), and accomplishes the stated goal (make beeping sound). This design would work because electrical energy from the battery flows through the switch when pressed, then the buzzer converts electrical to sound energy we need. This demonstrates understanding that design choices must enable the needed energy conversion. Choice D is incorrect because it suggests using a motor to spin a wheel, which converts electrical to motion energy, not sound. This error occurs when students don't match the output energy to the goal - the problem requires an alarm that beeps (sound), not something that moves (motion). The design must produce the right form of output energy (sound) to accomplish the goal (make an alarm). To help students design energy conversion devices: Teach design process explicitly - (1) What's the goal? (2) What energy output do we need? (3) What energy input do we have? (4) What component converts between them? Create component reference chart: buzzer/speaker (electrical→sound), motor (electrical→motion), LED (electrical→light), battery (chemical→electrical), solar panel (light→electrical). Practice matching: Given goal 'make alarm sound,' identify needed output (sound), available input (battery electrical energy), and conversion path (battery→electrical→buzzer→sound). Build simple examples: battery+buzzer doorbell, battery+motor fan, battery+LED light. Emphasize: Design must accomplish the goal by producing the right form of output energy using available input energy. Test designs to refine and improve.

Question 20

For this design challenge, Keisha will build a toy car that moves using a small motor. The device must convert electrical energy from a battery into motion energy that turns the wheels. She may use a battery pack, motor, wheels, and wires, and it must roll at least 1 meter. Which design would best solve this problem?

  1. Connect a battery to a motor that spins an axle to turn the wheels. (correct answer)
  2. Connect a battery to an LED so the car makes light instead of moving.
  3. Use a hand crank to power an LED, so motion becomes light energy.
  4. Decorate cardboard wheels without a motor, so no energy conversion is needed.
Explanation: This question tests 4th grade ability to design devices that convert energy from one form to another (NGSS 4-PS3-4). Students must understand that effective designs require the right energy conversion to accomplish the goal. To design an energy conversion device: (1) Identify the goal (what should device do?), (2) Determine needed output energy (light, motion, heat, sound?), (3) Identify available input energy (solar, battery, motion, electrical?), (4) Select components that enable conversion (solar panel for light→electrical, motor for electrical→motion, LED for electrical→light), (5) Plan how energy flows through device (input→conversion component→output). The design must match: if goal is to produce motion, output must be motion energy. In this challenge, the goal is to build a toy car that moves. To accomplish this, the device needs to produce motion energy to turn the wheels. The available input energy is electrical from a battery. Therefore, the design should convert electrical to motion using a motor. For example, battery provides electricity that flows through wires to motor, motor spins and turns axle connected to wheels, making car roll forward. Choice A is correct because it identifies the right energy conversion (electrical to motion), includes appropriate components (battery, motor, axle, wheels), and accomplishes the stated goal (make toy car move). This design would work because electrical energy from the battery flows to the motor which converts it to motion energy that turns the wheels. This demonstrates understanding that design choices must enable the needed energy conversion. Choice B is incorrect because it suggests connecting battery to LED, which converts electrical to light energy, not motion. This error occurs when students use familiar components without matching output to goal - the problem requires motion to move the car, not light. The design must produce motion energy to accomplish the goal of making the car roll. To help students design energy conversion devices: Teach design process explicitly - (1) What's the goal? (2) What energy output do we need? (3) What energy input do we have? (4) What component converts between them? Create component reference chart: motor (electrical→motion), LED (electrical→light), speaker (electrical→sound), battery (chemical→electrical), generator (motion→electrical). Practice matching: Given goal 'make car move,' identify needed output (motion), available input (battery electrical energy), and conversion path (battery→electrical→motor→motion→wheels). Build simple examples: battery+motor car, battery+LED light, battery+buzzer alarm. Emphasize: Design must accomplish the goal by producing the right form of output energy using available input energy. Test designs to refine and improve.