All flashcards
Flashcard 1: Which collision usually makes more heat and sound: a soft cushion hit or a hard wall hit?
Answer: A hard wall hit. Harder surfaces convert more energy to heat and sound.
Flashcard 2: Identify the type of collision where objects stick together after hitting.
Answer: Sticking collision. Objects remain joined after impact, moving as one.
Flashcard 3: Identify the type of collision where objects bounce apart after hitting.
Answer: Bouncing collision. Objects separate after impact, like a ball bouncing.
Flashcard 4: What does it mean if a moving object stops after hitting another object?
Answer: Most of its energy was transferred to the other object and/or heat and sound. All kinetic energy was transferred away.
Flashcard 5: What does it mean if an object slows down right after a collision?
Answer: It transferred some of its energy to the other object. The object gave away some kinetic energy.
Flashcard 6: What does it mean if an object speeds up right after a collision?
Answer: It gained energy from the other object. Energy transfer increases the object's kinetic energy.
Flashcard 7: Which evidence best shows sound energy was produced in a collision: a loud noise, a shadow, or a smell?
Answer: A loud noise. Impact vibrations create sound waves we can hear.
Flashcard 8: Which evidence best shows energy became heat in a collision: objects warm up, objects turn blue, or objects float?
Answer: Objects warm up. Friction and impact convert motion energy to thermal energy.
Flashcard 9: Which evidence best shows energy was transferred in a collision: speed change, color change, or shape change?
Answer: Speed change. Motion changes show kinetic energy was transferred.
Flashcard 10: Which statement is correct: energy is created in collisions or energy changes form and transfers?
Answer: Energy changes form and transfers. Energy cannot be created or destroyed, only transformed.
Flashcard 11: Choose the correct claim: If a ball rebounds higher, it had more energy or less energy after the collision?
Answer: More energy after the collision. Higher rebound means it retained or gained energy.
Flashcard 12: Identify the energy transfer: A rolling ball hits a stationary ball, and the second ball starts moving.
Answer: Energy transferred from the first ball to the second ball. Motion energy moved from moving to stationary object.
Flashcard 13: Identify the best evidence of energy transfer: a toy car hits a block and the block slides 10 cm.
Answer: The block moved (slid) after the collision. Block's motion proves it received energy from the car.
Flashcard 14: Which object gained energy: a moving skateboard hits a cone, and the cone tips over and moves?
Answer: The cone gained energy. Tipping and moving shows energy was received.
Flashcard 15: Which claim matches the evidence: two objects collide and both change direction immediately afterward?
Answer: Energy was transferred between the objects. Direction changes prove energy exchange occurred.
Flashcard 16: Identify the energy change: modeling clay hits the floor and becomes flatter.
Answer: Some motion energy changed into deformation and heat. Kinetic energy converted to shape change and heat.
Flashcard 17: Choose the best conclusion: after a collision, objects are warmer and a sound was heard.
Answer: Some motion energy changed into heat and sound. Temperature rise and noise prove energy conversion.
Flashcard 18: Which conclusion is best: a ball hits a wall and bounces back slower than before the hit.
Answer: Some energy transferred to the wall and to heat and sound. Lower speed shows energy was lost to wall and friction.
Flashcard 19: What is energy transfer in a collision?
Answer: Energy moving from one object to another during contact. Energy passes between objects when they collide.
Flashcard 20: What is energy transfer in a collision?
Answer: Energy moving from one object to another during contact. Kinetic energy passes between objects when they collide.
Flashcard 21: Which collision likely transfers more energy: a slow tap or a fast hit (same objects)?
Answer: A fast hit. Higher velocity means more kinetic energy to transfer.
Flashcard 22: What evidence shows that some kinetic energy stayed as motion after a collision?
Answer: One or both objects keep moving after the collision. Continued motion proves not all energy transformed to other forms.
Flashcard 23: Identify the best evidence that energy was transferred to the surroundings during a collision.
Answer: Sound, heat, or visible damage to objects. These forms show kinetic energy converted to non-motion energy.
Flashcard 24: Which option best indicates greater energy transfer: a small dent or a large dent after the same type of collision?
Answer: A large dent. More deformation requires more energy input from the collision.
Flashcard 25: What is the direction of energy transfer in a collision between a moving object and a stationary object?
Answer: From the moving object to the stationary object. Energy flows from high (moving) to low (still) concentration.
Flashcard 26: Identify the evidence of energy changing into deformation when a clay ball hits the floor and flattens.
Answer: A change in shape (flattening). Shape change shows energy did work deforming the material.
Flashcard 27: Which observation is strongest evidence of energy changing into sound during a collision: a loud bang or a smooth roll?
Answer: A loud bang. Sound waves carry energy away from the collision.
Flashcard 28: In an inelastic collision, kinetic energy is mostly changed into which forms of energy?
Answer: Heat, sound, and shape change (deformation). Motion energy transforms into thermal, acoustic, and mechanical work.
Flashcard 29: Identify the energy change when a moving ball hits a still ball and slows down.
Answer: The moving ball transfers kinetic energy to the still ball. Motion energy flows from the moving to the stationary object.
Flashcard 30: Which option is the best evidence of energy transfer: color change or change in speed after impact?
Answer: Change in speed after impact. Motion changes directly show energy transfer between objects.