Explanation:
We need to decide whether each situation describes
potential energy (stored energy, waiting to be used) or
kinetic energy (energy of motion — something is actively working or moving).
Let’s go one by one:
1) When a dog is sleeping → The dog is not moving. It has stored energy (e.g., chemical energy in its body), but it’s not using it right now. So this is
potential energy.
2) When a dog is running → The dog is moving! Motion = kinetic energy. So
kinetic energy.
3) If the light is on → Light is being emitted — that means energy is being used *right now*. The bulb is converting electrical energy into light and heat, so it’s active work. That’s
kinetic energy.
*(Note: Some might think “light” is stored, but once the light is on, photons are moving — that’s kinetic energy.)*
4) If the light is off → No light is being produced. The energy is stored (e.g., in the battery or power source), waiting to be used. So
potential energy.
5) When the orange is in the tree → It’s sitting still, high up. Gravity could pull it down — it has gravitational potential energy. So
potential energy.
6) When the orange is falling from the tree → It’s moving downward due to gravity. Motion =
kinetic energy.
7) When the flash light is ______, it is potential energy.
→ For a flashlight to have *potential* energy, it must be *off* (batteries are charged, but no light yet). So:
off
8) When the flash light is ______, it is kinetic energy.
→ When it’s *on*, light is being emitted (photons moving), and electricity is flowing — active energy use. So:
on
9) When the blender is ______, it is potential energy.
→ When it’s *off* (plugged in or batteries full, but blades not spinning), energy is stored. So:
off
10) When the blender is ______, it is kinetic energy.
→ When it’s *on*, blades are spinning — motion! So:
on
Let me double-check:
- Sleeping dog → not moving → potential
✔
- Running dog → moving → kinetic
✔
- Light on → emitting light (motion of photons) → kinetic
✔
- Light off → stored → potential
✔
- Orange in tree → height = stored gravitational energy → potential
✔
- Orange falling → moving → kinetic
✔
- Flashlight off → potential
✔
- Flashlight on → kinetic
✔
- Blender off → potential
✔
- Blender on → kinetic
✔
All consistent.
Final Answer:
1) potential
2) kinetic
3) kinetic
4) potential
5) potential
6) kinetic
7) off
8) on
9) off
10) on
Parent Tip: Review the logic above to help your child master the concept of kinetic energy worksheet middle school.
