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work energy power

Total questions: 122

Worksheet time: 2hrs 52mins

Name
Class
Date
1.

The unit of work is

a)

watt

b)

hertz

c)

joule

d)

pascal

2.

What is the unit for power?

a)

what

b)

watt

c)

joule

d)

Jewel-Osco

3.

Which requires more WORK – a person WALKING up stairs OR a person RUNNING up stairs?

a)

walking

b)

running

c)

they require equal work

d)

no work is required for either because the movement is vertical

4.

Which requires more POWER – a person WALKING up stairs OR a person RUNNING up stairs?

a)

walking

b)

running

c)

they require equal power output

d)

no power is required at all

5.
How do you calculate power?
a)
P = W/t
b)

P = F/t

c)

P = W * t

d)

P = F * t

6.

Which does not illustrate kinetic energy?

a)

It is expressed in Joule.

b)

It depends upon the objects’ mass and speed.

c)

It is the energy an object possesses due to its motion.

d)

It depends upon the objects’ mass and objects’ height.

7.

As speed increases, kinetic energy

a)

Increases

b)

Decreases

c)

Stays the same

d)

Increase then decrease

8.

If a 4 kg cat is running at 3 m/s what is its kinetic energy?

a)

18 J

b)

18

c)

12

d)

12 J

9.

The kid at the top of the roller coaster car pictured here has

a)

100% Potential Energy

0% Kinetic Energy

b)

75% Potential Energy

25% Kinetic Energy

c)

50% Potential Energy

50% Kinetic Energy

d)

0% Potential Energy

100% Kinetic Energy

10.
What type of energy is in this picture?
a)
Kinetic
b)

Elastic Potential

c)

Gravitational Potential

d)
Sound
11.
On a roller coaster, where is maximum potential energy?
a)
At the bottom of a big hill
b)
When going around a corner
c)

At halfway down the track

d)
At the top of a big hill
12.
On a roller coaster, where is maximum kinetic 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
13.
At what position does the rock have the greatest kinetic energy?
a)
A
b)
B
c)

C

d)

D

e)

E

14.

When you compress a spring, you are storing __________ energy.

a)

sound

b)

elastic

c)

kinetic

d)

chemical

15.
Energy due to motion is ____________ energy. 
a)
Potential 
b)

Chemical

c)
Kinetic
d)
Friction
16.

The formula for gravitational potential energy (GPE) in an object is U = mgh.

Which object will have the largest value for its GPE?

a)
b)
c)
d)
17.

If these are all moving at the SAME SPEED, which vehicle has the greatest Kinetic Energy?

(Think about their sizes)

a)
b)
c)
d)
18.
a)
Potential Energy
b)
Kinetic Energy
19.

Which type of energy causes the arrow to shoot from the bow?

a)
kinetic
b)
elastic
c)

hooke's law

d)
gravitational
20.

The diagram shows the same spring being stretched at different lengths using different masses. At which length does the spring have the MOST potential energy?

a)

length A

b)

length B

c)

length C

d)

length D

21.

Which requires more WORK – a person WALKING up stairs OR a person RUNNING up stairs?

a)

walking

b)

running

c)

they require equal work

d)

no work is required for either because the movement is vertical

22.

Which requires more POWER – a person WALKING up stairs OR a person RUNNING up stairs?

a)

walking

b)

running

c)

they require equal power output

d)

no power is required at all

23.

Which does not illustrate kinetic energy?

a)

It is expressed in Joule.

b)

It depends upon the objects’ mass and speed.

c)

It is the energy an object possesses due to its motion.

d)

It depends upon the objects’ mass and objects’ height.

24.

As speed increases, kinetic energy

a)

Increases

b)

Decreases

c)

Stays the same

d)

Increase then decrease

25.

If a 4 kg cat is running at 3 m/s what is its kinetic energy?

a)

18 J

b)

18

c)

12

d)

12 J

26.

The kid at the top of the roller coaster car pictured here has

a)

100% Potential Energy

0% Kinetic Energy

b)

75% Potential Energy

25% Kinetic Energy

c)

50% Potential Energy

50% Kinetic Energy

d)

0% Potential Energy

100% Kinetic Energy

27.
What type of energy is in this picture?
a)
Kinetic
b)

Elastic Potential

c)

Gravitational Potential

d)
Sound
28.
On a roller coaster, where is maximum potential energy?
a)
At the bottom of a big hill
b)
When going around a corner
c)

At halfway down the track

d)
At the top of a big hill
29.
On a roller coaster, where is maximum kinetic 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.
At what position does the rock have the greatest kinetic energy?
a)
A
b)
B
c)

C

d)

D

e)

E

31.

The formula for gravitational potential energy (GPE) in an object is U = mgh.

Which object will have the largest value for its GPE?

a)
b)
c)
d)
32.

Work causes a change in

a)

Sweat

b)

Energy

c)

Calories

d)

Force

33.
Which situation is work not done?
a)
lifting a 20 pound box off the floor
b)
holding a 20 pound box above the floor
c)
sliding a 20 pound box across the floor
d)
sliding a 20 pound box up an inclined plane
34.

Where is kinetic energy at its maximum?

a)

a

b)

b

c)

c

d)

d

35.

A force F of strength 20 N acts on an object of mass 3 kg as it moves a distance of 4 m. If F is perpendicular to the 4 m displacement, the work it does is equal to

a)

0 J

b)

60 J

c)

80 J

d)

600 J

36.

Under the influence of a force, an object of mass 4 kg accelerates from 3 m/s to 6 m/s in 8 s. How much work was done on the object during this time?

a)

27 J

b)

54 J

c)

72 J

d)

96 J

37.

A box of mass m slides down a frictionless inclined plane of length L and vertical height of h. What is the change in its gravitational potential energy?

a)

mgL

b)

mgh

c)

mgLh\frac{mgL}{h}  

d)

mghL\frac{mgh}{L}  

38.

While a person lifts a book of mass 2 kg from the floor to a tabletop, 1.5 m above the floor, how much work does the gravitational force do on the book?

a)

-30 J

b)

-15 J

c)

0 J

d)

15 J

39.

A satellite is currently orbiting Earth in a circular orbit of radius R; its kinetic energy is K1 . If the satellite is moved and enters a new circular orbit of radius 2R, what will be its kinetic energy?

a)

K14\frac{K_1}{4}  

b)

K12\frac{K_1}{2}  

c)

2K12K_1  

d)

4K14K_1  

40.

An object of mass m is traveling at constant speed v in a circular path of radius r. How much work is done by the centripetal force during one-half of a revolution?

a)

πmv2\pi mv^2  

b)

0

c)

πmv2r\pi mv^2r  

d)

2πmv2r2\pi mv^2r  

41.

A block of mass m slides from rest down an inclined plane of length s and height h. If F is the magnitude of the force of kinetic friction acting on the block as it slides, then the kinetic energy of the block when it reaches the bottom of the incline will be equal to

a)

mgh

b)

mgs - Fh

c)

mgh - Fs

d)

mgh - Fs

42.

As a rock of mass 4 kg drops from the edge of a 40-meter high cliff, it experiences air resistance, whose average strength during the descent is 20 N. At what speed will the rock hit the ground?

a)

10 m/s

b)

12 m/s

c)

16 m/s

d)

20 m/s

43.

An astronaut drops a rock from the op of a crater on the Moon. When the rock is halfway down to the bottom of the crater, its speed is what fraction of its final impact speed?

a)

14\frac{1}{4}  

b)

12 2\frac{1}{2\ \sqrt[]{2}}  

c)

12\frac{1}{2}  

d)

12\frac{1}{\sqrt[]{2}}  

44.

A force of 200 N is required to keep an object sliding at a constant speed of 2 m/s across a rough floor. How much power is being expended to maintain this motion?

a)

50 W

b)

100 W

c)

200 W

d)

400 W

45.

When a force acts upon an object to cause a displacement of the object, it is said that work was done upon the object.

a)

True

b)

False

46.

There are three key ingredients to work. What are they? **there is more than one answer **

a)

force

b)

time

c)

displacement

d)

mass

e)

cause

47.

When the work is done upon the object, that object gains _____.

a)

Mass

b)

Energy

c)

Power

d)

Time

48.

The energy acquired by the objects upon which work is done is known as _______ ___________.

(a)  

49.

Mechanical energy can be either _____ or _______. **there is more than one answer**

a)

Power Energy

b)

Kinetic Energy

c)

Work Energy

d)

Potential Energy

50.

Which energy is referred to also as "Energy of Motion"?

(a)  

51.

Which energy is referred to also as "stored energy of position"?

(a)  

52.

One ______ is equivalent to one Newton of force causing a displacement of one meter.

a)

Watt

b)

Joule

c)

Meter

d)

Newton

53.

______ is the unit of work.

a)

Mass

b)

Newton

c)

Force

d)

Joule

e)

Watt

54.

An object that possesses mechanical energy is able to do work.

a)

True

b)

False

55.

mechanical energy is often defined as the ability to do work

a)

True

b)

False

56.

_______ ______ is the stored energy of position possessed by an object.

a)

Kinetic Energy

b)

Gravitational Energy

c)

Potential Energy

d)

Force Energy

57.

There are two forms of Potential Energy, what are they? **there is more than one answer*

a)

gravitational potential energy

b)

force potential energy

c)

mass potential energy

d)

elastic potential energy

58.

_____ potential energy is the energy stored in an object as the result of its vertical position or height.

a)

Elastic

b)

Gravitational

59.

_____ potential energy is the energy stored in elastic materials as the result of their stretching or compressing.

a)

Elastic

b)

Gravitational

60.

_____ is the rate at which work is done.

a)

Force

b)

Power

c)

Work

d)

Energy

61.

The standard metric unit of power is the (a)   .

62.

____ is equivalent to a Joule/second

a)

Force

b)

Newton

c)

Watt

d)

Kilogram

e)

Joule

63.

A particle is in motion along a straight line under the action of force F which varies with velocity v as per law F=AvF=\frac{A}{v}  where A is a constant. The work done by the force in time t is

a)

At

b)

At2

c)

A/t

d)

A/t2

64.

A loco engine of mass 40 ton moves on a track having μ = 0.01\mu\ =\ 0.01 . When its speed is 72 kmh-1 , power developed by engine is 880 kW. Its acceleration at that instant is (in ms-2)

a)

0.1

b)

1

c)

0.2

d)

2

65.

Power of a force acting on a particle of mass 2 kg varies with time as per P = 2t33P\ =\ \frac{2t^3}{3}  where P is in watt and t is in second. At t=0 the particle is at rest. its velocity at t=3 ms-1 is

a)

2

b)

6\sqrt[]{6}  

c)

222\sqrt[]{2}  

d)

4

66.

if the kinetic energy increases by 800% then momentum increases by

a)

400 %

b)

200 %

c)

141 %

d)

100 %

67.

A 1kg stone is dropped down from a height of 2m on a vertically fixed spring of spring constant k = 200 Nm-1. The maximum energy stored in the spring subsequently is ( in Joules )

a)

20.05

b)

25

c)

26.2

d)

28

68.

Work of W is performed to compress a spring and then an additional 2W is performed to elongate it. The ratio of elongation to compression is

a)

0

b)

1

c)

2\sqrt[]{2}  

d)

3\sqrt[]{3}  

69.

A body of mass M moving with the same kinetic energy K collides elastically with a mass m at rest and kinetic energy of M after collision is K/4 and it moves in the same direction. Then the ratio M/m is

a)

2

b)

3

c)

3.5

d)

4.2

70.

After an elastic collision between a particle of speed v and a particle at rest, the lighter particle moves at v/2. The ratio of their masses is (heavier: lighter)

a)

3/2

b)

2

c)

3

d)

4

71.

In elastic collisions

a)

momentum is conserved

b)

KE is conserved

c)

Both momentum and KE are conserved

d)

Momentum not conserved but KE is conserved

72.

A stationary bomb explodes in to two parts, 4kg and 8kg. The velocity of the 8kg mass is 6m/s. The KE of the other body is

a)

48J

b)

24J

c)

288J

d)

16J

73.

The formula "Force x Distance" is used to solve for (a)   .

74.

The formula "Force x Distance x Cos(angle)" is used to find (a)   .

75.

Work = if force and displacement are the same direction then work is (a)   .

76.

Work = if the force and displacement are opposite direction then the work is (a)   .

77.

This formula " WorkTime\frac{Work}{Time}  " is used to solve for (a)   >

78.

This formula " Force x DisplacementTime\frac{Force\ x\ Displacement}{Time} " is used to solve for (a)   .

79.

This formula "Mass x Velocity" is used to solve for (a)   .

80.

This formula " 12 x Mass x Velocity2\frac{1}{2}\ x\ Mass\ x\ Velocity^2 " is used to solve for (a)   .

81.

This formula " Mass x VelocityTime\frac{Mass\ x\ Velocity}{Time} " is used to solve for (a)   .

82.

This formula " Mass x (Vf−Vi)Time\frac{Mass\ x\ \left(Vf-Vi\right)}{Time} " is used to solve for (a)   .

83.

If the numbers from both equations, "Force x Time" and "Mass x Velocity" equals the same number. Then this is referred to as (a)   .

84.

Potential Energy has two types. Which are they? **there can be more than one answer**

a)

Elastic Potential Energy

b)

Height Energy

c)

Gravitational Potential Energy

d)

Small Energy

e)

Big Energy

85.

The formula "Mass x Gravity x Height" is used to solve for (a)   .

86.

The formula " 12 ×K ×X2\frac{1}{2}\ \times K\ \times X^2  " is used to solve for (a)   .

87.

In the Formula " PEe = 12× K × X2PEe\ =\ \frac{1}{2}\times\ K\ \times\ X^2 " what does the K represent?

(a)  

88.

In the Formula " PEe = 12× K × X2PEe\ =\ \frac{1}{2}\times\ K\ \times\ X^2 " what must be done if you are given two distances for X2X^2 ?

(a)  

89.

What are the units for force?

(a)  

90.

What are the units for Power?

(a)  

91.

What are the units for Work?

(a)  

92.

For every 1kg of Mass there are how many Units of Force?

(a)  

93.

Two factors that determine work are...

a)

Force

b)

Mass

c)

Velocity

d)

Distance

94.

Units of force are...

a)

Newtons

b)

Grams

c)

Joules

d)

Meters

95.

Units of work are...

a)

Newtons

b)

Grams

c)

Joules

d)

Meters

96.

If you push a cart with a force of 60 N for 2 m... how much work have you done?

a)

120 J

b)

30 J

c)

120 N

d)

30 N

97.

Work is

a)

having a job

b)

movement

c)

energy transfer

d)

energy transfer to an object

98.

The ( ) the force the ( ) work is done

a)

less, more

b)

smaller, more

c)

bigger, more

d)

bigger, less

99.

If the object does not move then what is happening

a)

work

b)

power

c)

no work is being done on the object

100.

What is the unit for power?

a)

what

b)

watt

c)

joule

d)

Jewel-Osco

101.

A basketball that is dropped bounces back up to its original height. Pick the correct energy transformation from the point when it was dropped until it returns to the original height.

a)

KE --> PE --> Elastic

b)

PE --> KE --> Elastic --> KE --> PE

c)

KE --> PE --> Elastic --> PE --> KE

d)

Elastic --> PE --> KE --> Elastic

102.

How much power is required to raise a 200-kg crate a vertical distance of 2 m in a time of 4 s?

a)

400 W

b)

1000 W

c)

1600 W

d)

4000 W

103.

A pendulum bob swings from potential C to D as indicated in the diagram. There is no friction or air resistance. Which of the following is not true?

a)

Kinetic Energy decreases from C to D

b)

Potential Energy decreases from C to D

c)

The Total Energy stays constant from C to D.

d)

The bob is fastest at point C.

104.

A skier slides down an incline as shown. The work done by friction is:

a)

Positive

b)

Negative

c)

Zero

d)

All of the above

105.

Work done by friction ____________ of the body.

a)

(a) increases kinetic energy

b)

(b) decreases kinetic energy

c)

(c) increases potential energy

d)

(d) decreases potential energy

106.
Power is
a)
the ability to do work.
b)
the rate at which work is done.
c)
the force applied to an object for a distance.
d)
none of the above.
107.
Gravitational potential energy depends on the ________ and ________ of the object. 
a)
Height and mass
b)
Friction and movement
c)
Mass and Movement
d)
Height and Friction 
108.

How much power do you have if you pushed a box with a force of 10 N across the floor a distance of 5 m over a period of 5 seconds?

a)

50 W

b)

10 W

c)

250 W

d)

20 W

109.

A 1000kg car is moving at 5m/s, what is the Kinetic Energy of the car?

a)

6250000 J

b)

25000 J

c)

12500 J

d)

2500 J

110.

A 7.14 kg object has 700 J of stored gravitational potential energy. How high above the ground is the object?

a)

0.9m

b)

7.14m

c)

10m

d)

20m

111.

A 2kg ball rolls with a KE of 36 J - what is the speed of the ball?

a)

6m/s

b)

7.4m/s

c)

18m/s

d)

None of these

112.

A 50 kg object sits on the roof of a 25 m building. If we neglect friction, at what velocity will it hit the ground if it falls freely?

a)

22.14 m/s

b)

45 km/h

c)

29.56 m/s

d)

None of the above

113.

Where is the car moving fastest?

a)

A

b)

B

c)

C

d)

D

114.

Which number shows kinetic energy at its maximum?

a)

three

b)

two

c)

four

d)

five

115.

Stored energy or energy due to its position is called

a)

mechanical energy

b)

potential energy

c)

kinetic energy

d)

thermal energy

116.

Which of the following statements about a skier skiing down a steep slope is true?

a)

His kinetic energy decreases and his potential energy increases

b)

His potential energy decreases and his kinetic energy increases

c)

His chemical energy increases

d)

Both his potential and kinetic energy increases

117.

Energy in motion is called

a)

kinetic energy

b)

potential energy

c)

nuclear energy

d)

transfer energy

118.

Kinetic energy depends on_________ and _________.

a)

speed and mass

b)

speed and height

c)

height and mass

d)

energy and height

119.

What numbers show maximum potential energy on this pendulum?

a)

1 and 5

b)

1 and 4

c)

2 and 3

d)

3 and 4

120.

At which point(s) on the roller coaster is the gravitational potential energy at its maximum?

a)

A

b)

B

c)

C

d)

D

121.

The Law of Conservation of Energy states:

a)

Energy can created or destroyed but not transformed

b)

Energy cannot be created or destroyed, it can only transformed

c)

Energy can't be created, destroyed or transformed

d)

Energy cannot be created or destroyed.

122.

What happens when the ball goes from the highest position to the lowest position

a)

PE and KE increases and decreases together

b)

Impossible to know without knowing the mass of the object

c)

the PE decreases while KE increases

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