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 stationary but has the potential to fall due to its height. Potential energy is stored energy related to position. Kinetic energy is for motion, sound energy involves sound waves, and heat energy is about temperature. So the ball has potential energy.

A skateboarder at the top of a ramp has potential energy (due to height). When going down, the height decreases (less potential energy) and speed increases (more kinetic energy). So potential energy converts to kinetic energy. Other options (kinetic to potential, sound to light, chemical to electrical) don't match the ramp scenario.

Rubbing hands quickly involves kinetic energy (motion of hands). This motion generates heat due to friction, so kinetic energy is converted to heat energy. Energy doesn't disappear or get destroyed (law of conservation), and it doesn't convert to light here.

Answer:

C) Potential energy

Question 5