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practice test: Work, Power and Energy

Total questions: 35

Worksheet time: 2hrs 45mins

Name
Class
Date
1.
What states that energy can never be created or destroyed?
a)
law of conservation of momentum
b)
law of conservation of energy
c)
law of conservation of matter
d)
law of conservation of water
2.
What is the energy of position or shape that depends on weight and height, also called stored energy?
a)
Energy
b)
Kinetic energy
c)
Potential energy
d)
Sound energy
3.

What is the kinetic energy of a ball with a mass of 5kg rolling at 10m/s

a)

50 J

b)

5 J

c)

250 J

d)

25 J

4.

What is the kinetic energy of a 4kg shot put thrown with a velocity of 13m/s

a)

676 J

b)

3.25 J

c)

17J

d)

338 J

5.

Calculate the kinetic energy of an elephant when it walks at a speed of 2m/s having a mass, 2000kg.

a)

4,000 J

b)

8,000J

c)

1,000 J

d)

2,000 J

6.
Which point has the greatest potential energy (GPE)?
a)
A
b)
G
c)
D
d)
C
7.

How high will a 1-kilogram ball go if it is thrown straight up into the air with an initial velocity of 30 m/sec? _

a)

30 m

b)

45.9 m

c)

20 m

d)

9.8 m

8.
A 4.00 kg ball is on a 5.00 m ledge. If it is pushed off the ledge, how much kinetic energy will it have just before hitting the ground?
a)
196 Joules
b)
20 Joules 
c)
100 Joules 
d)
49 Joules
9.

A baseball player once bet he could catch a ball dropped from the Washington Monument, 169 meters up.

a) If the ball had a mass of .145 kg, what would be its gravitational potential energy be before falling? _ Joules

b) Ignoring air resistance, what would the speed of the ball be as the player caught it, 2 meters above the ground? _ m/s

a)

240 and 57.4

b)

240 and 43.7

c)

350 and 43.7

d)

350 and 22.5

10.

It takes 20 N of force to move a box a distance of 10 m. How much work is done on the box in Joules?

a)

200 J

b)

20.0J

c)

100 J

d)

10 J

11.
Two factors that determine work are
a)
size of the force, and distance
b)
size of the force, and type of force
c)
mass, and distance
12.

The unit for energy is

a)

meters per second (m/s)

b)

meters (m)

c)

Joules (J)

d)

kilograms (kg)

13.

A student moves a box across the floor by exerting 23.4N of force and doing 47.2J of work on the box. How far does the student move the box?

a)

2.01m

b)

.49m

c)

1104.48

d)

none of these

14.

How much work can be done in 5s if 29W of power are used?

a)

5.8J

b)

145J

c)

.17J

d)

none of these

15.

The unit for power is

a)

Joules (J)

b)

meters per second (m/s)

c)

Watts (W)

d)

seconds (s)

16.

How much power is produced by a light bulb doing 50J of work every 2 seconds?

a)

25W

b)

0.04W

c)

100W

d)

none of these

17.
Work can be expressed with what unit?
a)
a) Newton-meter
b)
b) Joule
c)
c) watt
d)
d) both a & b 
18.

The formula for work is

a)

W= FxD

b)

W=F/D

c)

F=W/D

d)

F=WxF

19.
The rate at which work is done is called
a)
Energy
b)
Work
c)
Power
d)
Force
20.
A compact fluorescent light bulb uses 156 J of energy in 6s. What is the power of the bulb?
a)
26W
b)
150W 
c)
936W
d)
156W
21.
The energy possessed by an object due to its motion AND position is called 
a)
Mechanical energy
b)
Potential energy
c)
Kinetic energy
d)
Power 
22.
Mechanical energy has the formula of
a)
a) ME=KE+PE
b)
b) ME=1/2mv²+mgh
c)
c) Both A&B
d)
d) Neither 
23.
No machine in existence has 100% efficiency due to ____________________.
a)
magic
b)
friction
c)
smoke
d)
input
24.
What kind of energy is represented in this picture?
a)
Thermal
b)
Potential
c)
Nuclear
d)
Mechanical
25.
When plants convert the sun's energy into food, which type of energy is it?
a)
kinetic
b)
chemical
c)
thermal
d)
radiant
26.
What kind of energy does this device use?
a)
Chemical
b)
Electrical
c)
Thermal
d)
Chemical
27.
A battery converts what type of energy to another?
a)
sound to kinetic
b)
light to heat
c)
mechanical to electrical
d)
chemical to electrical
28.
Wind turbines and windmills convert what energy to another?
a)
Kinetic to electric
b)
Gravitational potential to electric
c)
Mechanical to potential
d)
Thermal to sound
29.

On a roller coaster, where is maximum potential energy?

a)

At the bottom of a big hill

b)

When going around a corner

c)

When going upside down

d)

At the top of a big hill

30.
The ultimate source of energy is:
a)
The sky
b)
The sun
c)
Plants
d)
Movement
31.
If an object triples its velocity, how does this effect its KE?
a)
it is one third
b)
it triples
c)
it remains unchanged
d)
it is 9 times greater
32.

746 Watts is also known as?

a)

1 Kilojoule

b)

746 J/s

c)

1 Horsepower

d)

All of the above

e)

Both 746 J/s and 1 Horsepower

33.

work can be found by knowing?

a)

Force and Distance

b)

mass, acceleration and distance

c)

Change in Energy

d)

All of the above

34.

If you are sitting on a cold rock and your behind gets cold, its due to

a)

radiation

b)

conduction

c)

convection

d)

conservation

35.

There were two 35 Kg boxes that needed to be put in the back of a truck that is 3 m off the ground. Mover A lifts the box and puts it into the truck... Mover B slides the box up a frictionless ramp that is 8 m in length. Which one does more work?

4 lines

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