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Unit 8: Energy, Work & Power Review

Total questions: 24

Worksheet time: 12mins

Name
Class
Date
1.

Is work being done: a cup falls to the floor.

a)

Yes

b)

No

2.

Is work being done? A boulder is pushed with a force of 1300 N for 20 meters.

a)

Yes

b)

No

3.

Is work being done? A boy holds a book in his hands.

a)

Yes

b)

No

4.

Is work being done? A girl applies a force to a wall of bricks.

a)

Yes

b)

No

5.

As kinetic energy increases, velocity also increases.

a)

True

b)

False

6.

As speed increases, potential energy increases.

a)

True

b)

False

7.

According to the law of conservation of energy, the total amount of energy in the word

a)

remains constant

b)

changes constantly

c)

increases

d)

decreases

8.

The SI unit for work is

a)

watt

b)

joule

c)

calorie

d)

kilogram

9.

The SI unit for power is

a)

joule

b)

calorie

c)

kilogram

d)

watt

10.

The SI unit for weight is

a)

watt

b)

joule

c)

kilogram

d)

newton

11.

When solving power equations, time MUST be in seconds. If you are given minutes for time, you must convert to seconds before solving.

a)

True

b)

False

12.

A diver standing on top of a diving board above a pool has

a)

kinetic energy

b)

potential energy

c)

nuclear energy

d)

sound energy

13.

An un-lit match has

a)

kinetic energy

b)

chemical potential energy

c)

no energy

d)

elastic potential energy

14.

A hair dryer, toaster oven and an iron all have what energy change in common?

a)

The convert electrical energy to mechanical energy

b)

They convert mechanical energy to electrical energy

c)

They convert electrical energy to heat energy

d)

They convert electrical energy to light energy

15.

A bus transfers chemical energy into ___________ energy so that the bus can move.

a)

thermal

b)

mechanical

c)

gravitational potential

d)

kinetic

16.

A ball has 75 J of potential energy when sitting on a shelf. What is the amount of kinetic energy the ball has the instant it hits the floor?

a)

75 J

b)

0 J

c)

750 J

d)

25 J

17.

If the net force on an object is zero, then the object has:

a)

action forces

b)

balanced forces

c)

unbalanced forces

d)

reaction forces

18.

What happens to energy when work is done?

a)

energy is transferred

b)

energy is destroyed

c)

energy is gained

d)

energy is lost

19.

Stored energy is also known as ____________ energy.

a)

kinetic

b)

mechanical

c)

radiant

d)

potential

20.

Which of the following is NOT used to calculate potential energy?

a)

mass

b)

gravitational force

c)

height

d)

velocity

21.

In a nuclear fission reaction, mass is transformed into

a)

matter

b)

light

c)

nuclei

d)

energy

22.

The primary source of the sun's energy is

a)

chemical energy

b)

nuclear fusion

c)

nuclear fission

d)

potential energy

23.

The units used to show how much energy we get from food is called the _______________.

a)

joule

b)

calorie

c)

kilogram

d)

watt

24.

Your muscles change chemical energy into ____________ energy.

a)

electrical

b)

mechanical

c)

nuclear

d)

chemical