4th grade energy

Example

Which energy store is most important here: a drawn bow?

1. Stretched or squashed objects have an elastic potential energy store.
2. So the answer is: elastic potential (stretch or squash)

Answer: elastic potential (stretch or squash)

Example

What is the main useful energy output of a toaster?

1. Kettles, toasters and heaters transfer energy usefully by heating.
2. So the answer is: heating (thermal)

Answer: heating (thermal)

Example

Is this energy resource renewable or non-renewable: wind?

1. Renewable resources will not run out; they are replaced naturally.
2. So the answer is: renewable

Answer: renewable

Example

Why does a fast-moving football hurt more to stop than a slow one?

1. The faster an object moves, the more kinetic (motion) energy it has.
2. So the answer is: It has more energy of motion to transfer to your hands.

Answer: It has more energy of motion to transfer to your hands.

Example

Two toy cars crash. You hear a bang and the bumpers get slightly warm. Where did some of the motion energy go?

1. In a collision, motion energy is transferred to sound, heat and the motion of the other object.
2. So the answer is: into sound and heat

Answer: into sound and heat

Example

How is energy moving here: a torch (flashlight) beam?

1. Energy travels as light from a hot or glowing source.
2. So the answer is: light

Answer: light

Example

Is this a thermal conductor or a thermal insulator: steel?

1. Metals let heat pass through quickly.
2. So the answer is: thermal conductor (lets heat through easily)

Answer: thermal conductor (lets heat through easily)

Example

What is one environmental effect of using oil?

1. So the answer is: spills can harm sea life, and burning it adds carbon dioxide

Answer: spills can harm sea life, and burning it adds carbon dioxide