Potential and kinetic energy exercise - Free Printable

Let's solve this step by step. The task is to identify whether each object has potential energy, kinetic energy, or both, based on its state.

Definitions:

- Potential Energy (PE): Stored energy due to position, shape, or condition.
- Examples: gravitational potential energy (height), elastic potential energy (stretched rubber band).
- Kinetic Energy (KE): Energy of motion.
- Any object that is moving has kinetic energy.

Now let’s go through each item:

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1. An apple falling from a tree
→ It is in motion (falling), so it has kinetic energy.
→ It also has some gravitational potential energy (since it's still above the ground), but as it falls, potential energy converts to kinetic energy.
✔ Answer: Kinetic Energy (mainly, since it's falling)

2. A stationary ball on the ground
→ Not moving → no kinetic energy
→ On the ground → no height → no gravitational potential energy
→ But if it's just sitting, it may have negligible PE.
✔ Answer: No energy or None (but typically we say no kinetic energy, and no significant potential energy)
However, in basic terms: None or Neither

3. A sleeping dog
→ Not moving → no kinetic energy
→ At rest on ground → no significant potential energy
✔ Answer: None (or No energy)

4. A boy running across the street
→ Moving → has kinetic energy
✔ Answer: Kinetic Energy

5. A car traveling on the road
→ In motion → has kinetic energy
✔ Answer: Kinetic Energy

6. A stretched rubber band
→ Stretched → stored energy → elastic potential energy
✔ Answer: Potential Energy

7. A basketball being thrown
→ In motion → kinetic energy
→ Also at some height → has gravitational potential energy
→ So it has both, but the question asks for "the correct form" — likely expecting kinetic energy as primary
✔ Answer: Kinetic Energy (or possibly Both, but most likely Kinetic Energy)

8. A girl biking at the park
→ Moving → kinetic energy
✔ Answer: Kinetic Energy

9. A leaf lying on the ground
→ Stationary → no motion → no kinetic energy
→ No height → no gravitational potential energy
✔ Answer: None

10. A planet revolving around a star
→ In motion → has kinetic energy
→ Also has gravitational potential energy due to distance from star
→ So it has both, but again, the dominant form in motion is kinetic
✔ Answer: Kinetic Energy

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Final Answers:

1. An apple falling from a tree → Kinetic Energy
2. A stationary ball on the ground → None
3. A sleeping dog → None
4. A boy running across the street → Kinetic Energy
5. A car traveling on the road → Kinetic Energy
6. A stretched rubber band → Potential Energy
7. A basketball being thrown → Kinetic Energy
8. A girl biking at the park → Kinetic Energy
9. A leaf lying on the ground → None
10. A planet revolving around a star → Kinetic Energy

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✔ Note: Some objects (like #7 and #10) have both kinetic and potential energy, but since the instruction says "correct form of energy," and the focus is on what's most relevant, kinetic energy is emphasized when motion is involved. For #6, potential energy is clear because of the stretch.

Let me know if you'd like a version with "Both" included where appropriate!