Question

b) energy is always lost
c) energy can only be changed from one form to another
d) energy stays the same

1. a ball is sitting at the edge of a desk. what type of energy does it have?

a) kinetic energy
b) sound energy
c) potential energy
d) heat energy

1. when a skateboarder goes down a ramp, what energy transformation occurs?

a) kinetic to potential
b) potential to kinetic
c) sound to light
d) chemical to electrical

1. what happens to energy when you rub your hands together quickly?

a) the kinetic energy disappears
b) kinetic energy is converted to heat energy
c) it is destroyed
d) kinetic energy is changed into light energy

1. which of the following is an example of stored energy?

a) riding a bike
b) a moving car
c) a stretched bow
d) burning wood

1. which of the following is an example of kinetic energy?

a) a man sitting alone in the darkness
b) a bug sitting on a flower leaf
c) a football flying through the air
d) a ball at the top of a hill.

1. when you turn on a radio, what energy conversion takes place?

a) chemical to light
b) electrical to sound
c) light to heat
d) mechanical to chemical

Explanation:

Question 4

A ball at the edge of a desk is at a height, so it has potential energy (stored energy due to position). Kinetic energy is for motion, sound and heat don't apply here.

A skateboarder at the top of a ramp has potential energy (due to height). When going down, height decreases (potential energy decreases) and speed increases (kinetic energy increases), so potential energy converts to kinetic energy.

Rubbing hands quickly involves motion (kinetic energy). The friction produces heat, so kinetic energy is converted to heat energy. Energy isn't destroyed or converted to light here.

Answer:

C) Potential energy

Question 5