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Work, energy and power

Total questions: 50

Worksheet time: 50mins

Name
Class
Date
1.
Work divided by time equals...
a)
energy
b)
power
2.
The unit of work is the ...
a)
joule
b)
force
3.
The unit of power is the...
a)
work
b)
watt
4.
Force multiplied by distance equals...
a)
work
b)
power
5.
Work is done on an object when the object moves in the SAME direction in which the force is applied.
a)
True
b)
False
6.
If you pull at an angle instead of in the direction in which the object moves, MORE of your force does work.
a)
True
b)
False
7.
The FARTHER you move an object, the more work you do.
a)
True
b)
False
8.
The more POWER you use to move an object, the more work you do. 
a)
True
b)
False
9.
If you lift a box from the floor to a height of 1m and then carry the for for 10m, you do work only when you CARRY the box.
a)
True
b)
False
10.
Power is the RATE at which work is done. 
a)
True
b)
False
11.

What is an equivalent formula for force?

a)

F=d×tF=d\times t

b)

a=Fma=\frac{F}{m}

c)

F=WdF=\frac{W}{d}

d)

m=F×am=F\times a

12.

Work is measured in which units?

a)

Newtons

b)

Joules

c)

Watts

d)

Joule/sec

13.

A force applied on a block accelerates across a horizontal, frictionless surface. The energy gained by the block is equal to which?

a)

the momentum given to the block

b)

the work done on the block

c)

the power applied to the block

d)

the impulse applied to the block

14.

Power is measured in which units?

a)

Newtons

b)

Joules

c)

Watts

d)

Joule/sec

15.
Which of the following is a true statement about work?
a)
It measures how quickly an object accelerates 
b)
It measures how much effort is applied over a certain distance
c)
It measures the change in an object's rate of speed
d)
It measures how much time it takes to move a massive object
16.

____ is being done when a force is exerted on a wagon while it is being pulled up a hill.

a)

Power

b)

Force

c)

Work

17.
Which of these is a measure of force?
a)
100 newtons
b)
100 meters per second
c)
100 joules
d)
100 watts
18.

A strongman exerts 1500 N on the side of a building. After 2 minutes, the building doesn't move. How much work did he do?

a)

180,000 J

b)

0 J

c)

750 J

d)

1500 J

19.

You use 950 J of energy to push a sofa. If it took you 5 sec to move the sofa, what was your power?

a)

190 J

b)

4750 J

c)

4750 W

d)

190 W

20.

If 360 J of work is needed to move a crate a distance of 4 m, what is the weight of the crate?

a)

90 N

b)

720 N

c)

90 kg

d)

720 W

21.

A runner exerts 240,000 J when she runs for 10 min. What is the runner's power?

a)

400 W

b)

600 W

c)

400 J

d)

600 J

22.
A kid applies a force of 70 N to a ball over 1.1 meters. How much work did he do on the ball? 
a)
77 J
b)
7.7 J 
c)
0.7 J 
d)
770 J 
23.

A box is pushed across the floor a distance of 8 m with a force of 55 N in 7 s. What is the work done?

a)

440 J

b)

440 W

c)

62.9 J

d)

62.9 W

24.

The power rating of an electric lawnmower is 3000 W. If the lawnmower is used for 60 sec, how many joules of work can it do?

a)

270,000 W

b)

270,000 J

c)

180,000 J

d)

33.3 W

25.

A 400 N object is in a 32,000 N elevator that rises 30 m in 2 min. How much power is needed for the elevator's trip?

a)

8100 J

b)

972,000 J

c)

972,000 W

d)

8100 W

26.

A student who weighs 350 N climbs a flight of stairs 6 m high in 10 sec. How much power does the student need to do this?

a)

35.6 J

b)

35.6 W

c)

210 W

d)

583 J

27.
You do 90 joules of work in 30 seconds. How much power have you generated?
a)
30 watts
b)
3 watts
c)
120 watts
d)
270 watts
28.
You move a 12-newton box up a 6-meter ramp. In order to find out how much power you created, what would you need to know?
a)
The mass of the box
b)
The slope of the ramp 
c)
The direction the box moved
d)
How long the task took
29.
If 150 Joules of work is needed to move a box 10 meters, what force was used? 
a)
1500 N
b)
15 N
c)
1.5 N
d)
150 N
30.
If 150 Joules of work is needed to move a box 10 meters, what force was used? 
a)
1500 N
b)
15 N
c)
1.5 N
d)
150 N
31.
An Xbox consumes 15.7 watts while in standby mode. If you leave it in standby mode for 86,400 seconds (one day), how much work was done?
a)
1,356,490 J
b)
1,356,480 J
c)
1,356,470 J
d)
1,356,460 J
32.

A push or pull that causes an object to move, stop, or change direction.

a)

force

b)

friction

c)

gravity

d)

weight

33.

The ability to do work or cause change

a)

motion

b)

energy

c)

force

d)

power

34.

The change in position relative to another object

a)

work

b)

force

c)

motion

d)

power

35.

Force exerted on an object that causes it to moved

a)

force

b)

energy

c)

work

d)

power

36.

The formula for work is

a)

Work = force x distance

b)

Work = power x distance

c)

Work = force x time

d)

Work = power x time

37.

Work is measured in

a)

Joules

b)

Newtons

c)

Watts

d)

Watts Joules

38.

The rate at which one form of energy is transformed into another.

a)

energy

b)

work

c)

force

d)

power

39.

The formula for power is

a)

Power = Force x time/work

b)

Power = Force x distance/time

c)

Power = Work x time

d)

Power = Work x distance

40.

Power is measure in

a)

Joules

b)

Watts

c)

Newton-meters

d)

Joules-meters

41.

Four students are pushing on one side of a desk. Colin is pushing to the west, Zoey is pushing to the east, Will is pushing to the north, and Kylee is pushing to the south. If the desk moves to the north, which student does work on the desk?

a)

Colin

b)

Zoey

c)

Will

d)

Kylee

42.

In which scenario is Charlotte doing work?

a)

Charlotte carries her books to her next class.

b)

Charlotte picks up her books from her desk.

43.

As the sun went down, the house became dark and Kyle turned on the lights. Which statement is true about power?

a)

The power of the light Kyle turned on is used to exert force.

b)

The power of the light Kyle turned on is the amount of energy transferred per time.

c)

The power of the light Kyle turned on can be calculated using force and distance.

44.

How are energy and motion related?

a)

Energy is needed for motion.

b)

Motion is needed for energy.

c)

Motion is energy transferred.

45.

Which of the following is not a form of energy?

a)

light

b)

sound

c)

air

d)

electricity

46.

How can you increase your power when mowing grass?

a)

Spend more time mowing your grass.

b)

Mow less of your yard per minute.

c)

Mow your yard in less time.

47.

Suppose a cart has a kinetic energy of 0.5 J. If you add enough mass to double the mass and make the cart go three times as fast, its kinetic energy is now ---.

a)

6 J

b)

3 J

c)

18 J

d)

9 J

48.

Two equal mass marbles are at the top of a ramp. One marble falls to the ground off the back while the other rolls down the ramp. What is true about the marbles when they reach the ground?

a)

The marble that rolled down the ramp is moving faster than the marble that fell.

b)

The marble that fell down the back of the ramp is moving faster than the marble that rolled.

c)

The marble that rolled down the ramp is not moving when it reaches the ground.

d)

The two marbles are moving with the same speed.

49.

A crane lifts an 8-m long steel girder weighing 2600 N up 15 m off the ground. The crane did ___ of work.

a)

0 J

b)

39000 J

c)

20800 J

d)

2600 J

50.

Potential energy is associated with ---.

a)

speed

b)

position

c)

direction

d)

temperature

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