Work and Energy Practice Quiz

1. Faye is helping her neighbors move by lifting their boxes and placing them in their car.

She is lifting a box with a force or 120 N, 4 m high. How much work is she doing on the box?

W=Fd

= 120 x 4

= 480 J

Faye did a total of 480 J of work on the box.

2. Sarah did a total of 600 J of work pushing a grocery cart 3m. How much Force was being applied on the cart?

F= W/d

= 600 / 3

= 200 N

There was a total of 200 N of force being applied onto the grocery cart.

3. Jonny pushed a 12 kg desk 4 m. How much work did he do on the desk?

F= m x g

= 12 x 9.8

= 118 N

W=Fd

=118 x 4

= 472 J

Jonny did a total of 472 J on the desk.

4a. Define the word "work" in terms of science.

Work is the amount of effort spent when a force causes an object to move a distance.

b. Define the word "energy" in terms of science.

Work is the ability to do work.

5. Classify each of the following as "kinetic energy"or "potential energy"

a. a heavy rock held by someone, about to be dropped.

Potential Energy (gravitational)

b. a girl running as fast as she can.

Kinetic Energy

c. an elastic band being stretched back.

Potential Energy

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