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Where does the energy go when things collide?

4th grade (Year 5 in England) · 16 questions · Common Core: NGSS.4-PS3-3 · England: KS3 Physics: Energy (energy changes and transfers)

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1
Question 1
Why do cars have crumple zones that squash in a crash?
- A. Squashing the car's front takes in energy so less reaches the passengers.
- B. To make the car lighter.
- C. To make more noise.
- D. To speed the car up.
2
Question 2
True or false? Energy is destroyed in a crash.
- A. True
- B. False
3
Question 3
Which energy transfer does this example mainly show: a striker kicking a still ball?
- A. sound
- B. heat
- C. motion of another object
4
Question 4
Why does a bouncing ball bounce a little lower each time?
- A. The ball gets heavier.
- B. The floor gets taller.
- C. Gravity gets stronger.
- D. Each bounce transfers some energy into sound and heat.
5
Question 5
True or false? Rubbing and hitting can make surfaces warm up.
- A. True
- B. False
6
Question 6
Which energy transfer does this example mainly show: the clang of a dropped pan?
- A. sound
- B. heat
- C. motion of another object
7
Question 7
Why does a bouncing ball bounce a little lower each time?
- A. The ball gets heavier.
- B. Each bounce transfers some energy into sound and heat.
- C. Gravity gets stronger.
- D. The floor gets taller.
8
Question 8
True or false? Rubbing and hitting can make surfaces warm up.
- A. True
- B. False
9
Question 9
Which energy transfer does this example mainly show: a striker kicking a still ball?
- A. sound
- B. heat
- C. motion of another object
10
Question 10
Why does a bouncing ball bounce a little lower each time?
- A. The ball gets heavier.
- B. Gravity gets stronger.
- C. Each bounce transfers some energy into sound and heat.
- D. The floor gets taller.
11
Question 11
True or false? Energy is destroyed in a crash.
- A. True
- B. False
12
Question 12
Which energy transfer does this example mainly show: brake pads getting hot?
- A. sound
- B. heat
- C. motion of another object
13
Question 13
Why do cars have crumple zones that squash in a crash?
- A. Squashing the car's front takes in energy so less reaches the passengers.
- B. To make the car lighter.
- C. To make more noise.
- D. To speed the car up.
14
Question 14
True or false? A crash makes new energy.
- A. True
- B. False
15
Question 15
Which energy transfer does this example mainly show: the clang of a dropped pan?
- A. sound
- B. heat
- C. motion of another object
16
Question 16
Two toy cars crash. You hear a bang and the bumpers get slightly warm. Where did some of the motion energy go?
- A. into light only
- B. into the air as wind
- C. it was destroyed
- D. into sound and heat

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Answer key: Where does the energy go when things collide?

1. A. Squashing the car's front takes in energy so less reaches the passengers.
2. B. False
3. C. motion of another object
4. D. Each bounce transfers some energy into sound and heat.
5. A. True
6. A. sound
7. B. Each bounce transfers some energy into sound and heat.
8. A. True
9. C. motion of another object
10. C. Each bounce transfers some energy into sound and heat.
11. B. False
12. B. heat
13. A. Squashing the car's front takes in energy so less reaches the passengers.
14. B. False
15. A. sound
16. D. into sound and heat