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Work and Energy High School Physics

Total questions: 62

Worksheet time: 50mins

Name
Class
Date
1.
What is the mechanical advantage of a ramp that is 10 meters long and 2 meters high?
a)
20
b)
5
c)
8
d)
15
2.
A first-class lever has the fulcurm
a)
at the right end
b)
at the left end
c)
in the middle
d)
none of the above
3.
A wheelbarrow is an example of
a)
first-class lever
b)
second-class lever
c)
third-class lever
d)
fourth-class lever
4.
Which is an example of a third-class lever?
a)
a nutcracker
b)
a handheld boat paddle
c)
a crow bar 
d)
a screw
5.
A transfer of energy to a body by the application of a force that causes the body to move in the direction of the force is called
a)
power.
b)
work.
c)
distance.
d)
mechanical advantage.
6.
A boy exerts an average force of 65N when he lifts a box 1.2 meters. How much work does he do?
a)
0J
b)
54J
c)
66J
d)
78J
7.
__ is defined as the rate at which work is done.
a)
Power
b)
Joule
c)
Speed
d)
Mechanical Advantage
8.
How much power is required to do 180J of work in 2.4s?
a)
7.5W
b)
75W
c)
178W
d)
430W
9.
How much power is required to lift a 30.0N chair 0.20m in 2s?
a)
3.0W
b)
1.0W
c)
12W
d)
15W
10.
What are the two families of simple machines?
a)
wedge and compound
b)
first and second class
c)
inclined plane and lever
d)
pulley and screw
11.
Levers are divided into __ classes based on the location of the fulrcum and of the input and output forces.
a)
two 
b)
three
c)
four
d)
five
12.
What is the mechanical advantage of a ramp that is 2.0m long and 0.50m tall?
a)
1.0
b)
2.5
c)
4.0
d)
none of the above
13.
A wedge is a modified
a)
wheel and axle
b)
pulley
c)
inclined plane
d)
lever
14.
Which of the following is an example of a compound machine?
a)
scissors
b)
ax blade
c)
wheel and axle
d)
screw
15.
___ is a measure of the ability to do work.
a)
Photosynthesis
b)
Power
c)
Respiration
d)
Energy
16.
As a dropped penny falls toward the ground, __ energy is converted into __ energy.
a)
thermal, potential
b)
kinetic, vibrational
c)
kinetic, heat
d)
potential, kinetic
17.
A dropped racquetball will not return to its original position because
a)
potential energy is inefficient
b)
ME is stored up for later bounces
c)
some of ME is converted to nonmechanical energy
d)
energy is not conserved
18.
The law of conservation of energy states that energy 
a)
is created from motion
b)
cannot be created or destroyed
c)
is always equal and opposite
d)
can only be converted to heat
19.
__ is the ratio of useful work output to work input.
a)
Potential energy
b)
Efficiency
c)
Kinetic energy
d)
Power
20.
How efficient is a machine that uses 130J to lift a 50N load 2m?
a)
19%
b)
52%
c)
77%
d)
87%
21.
A boy pushes on a parked car with a force of 200N. The car does not move. How much work does the boy do on the car?
a)
200N
b)
200L
c)
zero
d)
none of the above
22.
What are the units of work?
a)
J
b)
Nm
c)
kgm2/s2
d)
All of the above
23.
A weightlifter presses a 400N weight 0.5m over his head in 2seconds. What is the power?
a)
100N
b)
25W
c)
400W
d)
100W
24.
Which is an example of mechanical energy?
a)
nuclear energy
b)
potential energy
c)
chemical energy
d)
light energy
25.
A man pushes a crate along a factory floor by exerting a force of 55N. If the crate moves a distance of 4.0m, how much work does the man perform?
a)
165N
b)
220N
c)
zero
d)
145J
26.
What are the units of power?
a)
watts
b)
horsepower
c)
joules per second
d)
all of the above
27.
Which of the following is not in the inclined plane family?
a)
a wedge
b)
a screw
c)
a ramp
d)
wheel and axle
28.
GPE depends on 
a)
the mass of the object
b)
the height of the object
c)
acceleration due to gravity
d)
all of the above
29.
A medicine ball has a mass of 5kg and is thrown with a speed of 2m/s. What is the kinetic energy?
a)
100J
b)
10J
c)
2000J
d)
500J
30.
The brakes on a car exert a frictional force of 6000N in getting a car to stop. If the work doen by the brakes is 120,000J in coming to a stop, how many meters does the car trabel after the driver applies the brakes.
a)
6m
b)
20m
c)
12m
d)
40m
31.
An object has a kinetic energy of 810J after falling a certain distance. If the mass of the object is 20kg, what is the speed of the object at this time?
a)
10m/s
b)
9m/s
c)
8m/s
d)
7m/s
32.
A quantity that measures the rate at which work is done is called
a)
power
b)
mechanical advantage
c)
energy
d)
efficiency
33.
Power is calculated by dividing work by
a)
efficiency
b)
mechanical advantage
c)
speed
d)
time
34.
A(n) __ is defined as a machine made up of more than one simple machine.
a)
lever
b)
screw
c)
compound machine
d)
wheel and axle
35.
The stored energy resulting from the relative positions of objects in a system is called
a)
kinetic energy
b)
mechanical energy
c)
potential energy
d)
nonmechanical energy
36.
The sum of kinetic and potential energy is
a)
mechanical energy
b)
nonmechanical energy
c)
light energy
d)
motion energy
37.
A __ is an inclined plane wrapped around a cylinder.
a)
Wheel and axle
b)
Pulley
c)
Screw
d)
Wedge
38.
A(n) __ system exchanges energy with the outside.
a)
closed
b)
open
c)
isolated
39.
All levers have a rigid arm that turns around a point called the
a)
fulcrum
b)
pivot point
c)
center
d)
fixed point
40.
When a system exchanges only energy with the environment outside the system, it is called a(n) __ system.
a)
open
b)
closed
c)
isolated
41.

Potential energy is the energy an object has because of its?

a)

size

b)

location (height)

c)

speed

d)

distance

42.

An object at rest may have?

a)

speed

b)

momentum

c)

energy

d)

size

43.

When a car's speed triples, its kinetic energy?

a)

triples

b)

increases by 4x's

c)

increases by 9x's

d)

decreases

44.

An object that has kinetic energy must be?

a)

elevated

b)

at rest

c)

moving

d)

invisible

45.

All simple machines work on the principle that?

a)

work input equal work output

b)

total momentum

c)

impulse equals momentum charge

d)

they are at rest

46.

A pulley system can?

a)

change the direction of a force

b)

multiply the force

c)

increase the amount of work done

d)

Both A and B

47.

In physics, work is defined as?

a)

force times distance

b)

force times time

c)

force divided by distance

d)

force times speed

48.

You carry one box up 3 flights of stairs. How much work did you do compared to carrying that box up only one flight of stairs?

a)

2 thirds

b)

twice as much

c)

4 times as much

d)

3 times as much

49.

If Tommy pushes a box with three times the force for three times the distance, he does?

a)

twice the work

b)

4 times the work

c)

3 times the work

d)

9 times the work

50.

Which requires more work: lifting a 20kg sack 2 m or lifting a 15 kg sack 5 m?

a)

20 kg 2 m

b)

15 kg 5m

51.

How much work is done on a box when a force of 20N pushes for 3 m?

a)

23J

b)

50J

c)

60J

d)

70J

52.

Mechanical energy can be in the form of?

a)

kinetic energy

b)

potential energy

c)

both kinetic and potential energy

53.

About how efficient is a typical gas burning car engine?

a)

20%

b)

30%

c)

40%

d)

50%

54.

An rubber band stretched back has 30J of potential energy. How much kinetic energy will it have?

a)

10J

b)

20J

c)

30J

d)

40J

55.

A ball is thrown into the air with 40J of kinetic energy. When it returns to its orginial level AFTER ENCOUNTERING AIR RESISTANCE, its kinetic energy is?

a)

more than 40J

b)

40J

c)

less than 40J

d)

not enough information

56.

How much power is required to do 80J of work in 8s?

a)

640W

b)

10W

c)

64W

d)

1S

57.

Which is not a simple machine?

a)

wood screw

b)

pulley

c)

scissors

d)

bicycle

58.

A which point is the PE the greates

a)

D

b)

C

c)

B

d)

A

59.

At which point is the KE the greatest?

a)

A

b)

B

c)

C

d)

D

60.

At which point is the PE the least

a)

A

b)

B

c)

C

d)

D

61.

At which point is the speed the greatest?

a)

A

b)

B

c)

C

d)

D

62.

A boy jumps out of a tree and falls safely to the ground. If he his PE is 450J at the top of the tree what is his KE?

a)

0J

b)

150J

c)

350J

d)

450J

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