Electric and Magnetic Interactions at Distance
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3rd Grade Science › Electric and Magnetic Interactions at Distance
Two balloons rubbed on hair move apart while 4 cm apart. Why?
They move apart because air always pushes balloons away.
They move apart only because the strings are pulling them.
They move apart because magnets in the balloons pull them together.
Static electricity makes the balloons repel without touching.
Explanation
This question relates to the skill 3-PS2-3, which involves asking questions about cause and effect relationships in electric or magnetic interactions at a distance. Non-contact forces like magnetic and electric forces can act through air or space, allowing objects to interact without physically touching each other. Two balloons rubbed on hair move apart from 4 cm due to static electric repulsion from like charges. Answer A accurately identifies static electricity causing repulsion without touch, prompting questions on electric interactions. Distractors fail by blaming air, strings, or magnets, which are incorrect forces or overlook non-contact aspects. Teach by charging balloons and observing repulsion, highlight the distance, and ask 'how can this happen without touching?' Try different charge levels or gaps to explore repulsion variations.
A magnet held above a toy car (with a paperclip) makes it roll. Why?
The magnet’s magnetic force pulls the paperclip, so the car moves.
The car moves because the car’s wheels create the magnetic force.
The car can only move if the magnet touches the car.
The car moves because the magnet makes loud sounds the car follows.
Explanation
This question relates to the skill 3-PS2-3, which involves asking questions about cause and effect relationships in electric or magnetic interactions at a distance. Non-contact forces like magnetic and electric forces can act through air or space, allowing objects to interact without physically touching each other. A magnet held above a toy car with a paperclip causes the car to roll due to magnetic attraction on the paperclip. Answer A is right as it explains the magnetic force pulling without touch, inviting questions about magnetic effects at a distance. Distractors fail by suggesting sounds, wheel forces, or requiring contact, which are inaccurate or contradict non-contact interaction. Teach using a magnet and toy car setup, point out the gap, and question 'how can this happen without touching?' Experiment with different magnet strengths or distances for deeper understanding.
Two magnets are close with a space between, not touching. One pushes the other. What acts?
The magnets move because they are made of plastic.
The motion happens first and then it makes the force.
Magnetic force can push or pull even when magnets do not touch.
No force acts until they touch.
Explanation
This question aligns with the skill 3-PS2-3, which involves asking questions to determine cause and effect relationships of electric or magnetic interactions between objects not in contact. Non-contact forces, such as magnetic and electric forces, can act through air or space, allowing objects to interact without physically touching each other. Two magnets with a space between them experience pushing due to magnetic repulsion acting across the gap. The correct answer, B, states magnetic force can push or pull without touching, correctly identifying the non-contact interaction. Distractors like A deny force without touch, C tie to material, and D reverse cause-effect, all incorrect. Teach with magnets on tracks, emphasizing the space, and ask 'How can one push the other without touching?' Test distances to explore force variations.
A magnet is held 2 cm above paperclips; they jump up without touching. Why?
The magnet’s magnetic force pulls the paperclips through the air.
The paperclips jump because they are alive and want to move.
The paperclips move only after the magnet touches them.
Gravity from the magnet pulls the paperclips up.
Explanation
This question relates to the skill 3-PS2-3, which involves asking questions about cause and effect relationships in electric or magnetic interactions at a distance. Non-contact forces like magnetic and electric forces can act through air or space, allowing objects to interact without physically touching each other. In this scenario, a magnet held 2 cm above paperclips causes them to jump up without any contact, demonstrating magnetic attraction. The correct answer, A, works because it accurately identifies the magnetic force pulling the paperclips through the air, recognizing the distance interaction and prompting questions about how forces act without touch. The distractors fail as they either require touching, attribute the movement to gravity incorrectly, or suggest non-scientific reasons like the paperclips being alive. To teach this, demonstrate with a magnet and paperclips, emphasizing the gap between them, and ask students 'how can this happen without touching?' Finally, test the attraction at different distances to observe how the force changes.
A plastic comb rubbed on wool is 3 cm from paper bits. Why do bits jump up?
The paper moves because it likes the comb’s color.
The comb must touch the paper to make it move.
The comb’s weight pulls the paper upward.
Static electricity can attract paper bits from a distance.
Explanation
This question assesses recognition of electric force attraction at a distance (3-PS2-3). Static electricity creates invisible electric fields that can attract lightweight objects across space without physical contact. When the plastic comb is rubbed on wool, electrons transfer between materials, giving the comb an electric charge that creates an attractive force field extending beyond its surface to pull the paper bits upward across the 3 cm gap. The correct answer C correctly identifies that static electricity can attract paper from a distance, showing understanding of non-contact electric forces. The distractors are wrong because A attributes movement to preference/choice, B incorrectly requires touching, and D confuses weight with electric attraction. Teaching strategies include demonstrating with various charged objects and lightweight materials, measuring attraction distances, and asking students "How does the comb lift paper without touching?" Emphasize the invisible electric field concept.
A magnet is held near a compass, not touching, and the needle turns. Why?
The compass needle turns because it hears the magnet.
The needle turns only if the magnet bumps the compass.
Static electricity from the magnet pulls the needle around.
Magnetic force from the magnet can move the needle from a distance.
Explanation
This question assesses understanding of magnetic interactions between objects at a distance (3-PS2-3). Magnetic forces act through space without physical contact, and a compass needle is itself a small magnet that responds to external magnetic fields. When the magnet is held near the compass, its magnetic field interacts with the compass needle's magnetic field, causing the needle to turn and align with the stronger external field without any touching. The correct answer B properly identifies that magnetic force from the magnet moves the needle from a distance, demonstrating understanding of magnetic field interactions. The distractors are incorrect because A anthropomorphizes the needle as hearing, C wrongly requires physical contact, and D confuses magnetic force with static electricity. Teaching strategies include demonstrating compass deflection at various distances from magnets, mapping magnetic fields with multiple compasses, and asking "Why does the needle move before the magnet touches the compass?"
A magnet is held 2 cm above paperclips, not touching. Why do paperclips jump up?
The paperclips are alive and choose to move.
The magnet must touch the paperclips to make them move.
Gravity from the magnet pulls the paperclips upward.
Magnetic force pulls the paperclips toward the magnet from a distance.
Explanation
This question tests understanding of magnetic interactions at a distance (3-PS2-3). Magnetic forces can act through air or space without objects touching, allowing magnets to attract or repel objects from a distance. In this scenario, the magnet creates an invisible magnetic field that extends beyond its surface, pulling the metal paperclips upward even though there's a 2 cm gap. The correct answer B identifies that magnetic force pulls the paperclips from a distance, demonstrating understanding of non-contact forces. The distractors fail because A attributes movement to living choice, C incorrectly requires touching for magnetic force, and D confuses magnetic attraction with gravity. To teach this concept, demonstrate with strong magnets and paperclips at various distances, emphasizing the invisible force field. Have students test how distance affects the strength of attraction and ask "How can the magnet pull without touching?"
A plastic comb rubbed on wool is 3 cm from paper bits. Paper jumps up. Why?
The comb makes wind that blows the paper upward.
The paper can move only if the comb touches it first.
Static electricity can pull the paper toward the comb from a distance.
The paper moves because it is the same color as the comb.
Explanation
This question aligns with the skill 3-PS2-3, which involves asking questions to determine cause and effect relationships of electric or magnetic interactions between objects not in contact. Non-contact forces, such as magnetic and electric forces, can act through air or space, allowing objects to interact without physically touching each other. The plastic comb, rubbed on wool, becomes statically charged and attracts paper bits from 3 cm away via electrostatic force. The correct choice, B, explains that static electricity pulls the paper toward the comb from a distance, correctly recognizing the non-contact interaction. Distractors like A attribute it to wind, C to color matching, and D require touching, all missing the electric force concept. Demonstrate with a comb and paper bits, emphasizing no contact, and ask 'How can the paper jump without the comb touching it?' Test at different distances to show how attraction weakens farther away.
A magnet held above a toy car with a paperclip makes it roll. What force acts?
The car moves only because the magnet is touching the car.
The car moves because the paperclip pushes the magnet.
The car moves because it is windy near the magnet.
Magnetic force pulls the paperclip and car even without touching.
Explanation
This question tests understanding of magnetic force acting at a distance on objects (3-PS2-3). Magnetic forces can act through air and other materials without direct contact, attracting magnetic materials like the paperclip attached to the toy car. The magnet held above creates a magnetic field that extends downward, pulling the paperclip (and thus the car) without touching either object, demonstrating action at a distance. The correct answer A identifies that magnetic force pulls both the paperclip and attached car without contact, showing comprehension of how magnetic forces work through space. The distractors fail because B attributes movement to wind, C incorrectly requires the magnet to touch the car, and D reverses the cause-effect relationship. To teach this, demonstrate with magnets moving objects with paperclips attached, testing different distances and barriers. Ask students to predict and explain how far away the magnet can still move the car.
Two balloons rubbed on hair are held 4 cm apart, not touching. They move apart. Why?
They move apart only because someone pulls them apart.
Magnets inside the balloons pull them apart.
The balloons move apart because they are different sizes.
Static electricity can push the balloons away from each other at a distance.
Explanation
This question aligns with the skill 3-PS2-3, which involves asking questions to determine cause and effect relationships of electric or magnetic interactions between objects not in contact. Non-contact forces, such as magnetic and electric forces, can act through air or space, allowing objects to interact without physically touching each other. Two balloons rubbed on hair gain like static charges, causing them to repel and move apart from 4 cm without contact. Answer A correctly states static electricity pushes them away at a distance, capturing the repulsion effect. Distractors fail as B attributes to size, C requires pulling, and D claims internal magnets, missing electrostatics. Teach by rubbing balloons and holding them near, noting the gap, and asking 'How can they move apart without touching?' Experiment with distances to observe repulsion changes.