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Unit 5 Test Review: Work and Power

Total questions: 53

Worksheet time: 27mins

Name
Class
Date
1.
In which of the following is no work done?
a)
climbing stairs
b)
lifting a book
c)
pushing a shopping cart
d)
pushing on a brick wall
2.
A force acting on an object does no work if
a)
a machine is used to move the object.
b)
the force is not in the direction of the object's motion.
c)
the force is greater than the force of friction.
d)
the object accelerates.
3.
What is the unit of work?
a)
joule
b)
newton
c)
watt
d)
meter
4.
If you exert a force of 10.0 N to lift a box a distance of 0.9 m, how much work do you do?
a)
0.1 J
b)
9.0 J
c)
10.9 J
d)
90.0 J
5.
If you perform 40 joules of work lifting a 10-N box from the floor to a shelf, how high is the shelf?
a)
0.3 m
b)
20 m
c)
4.0 m
d)
400 m
6.
The SI unit of power is the
a)
joule.
b)
newton.
c)
newton-meter.
d)
watt.
7.
The power of a machine measures
a)
its time of doing work.
b)
its strength.
c)
the force it produces.
d)
the work it does.
8.
If you exert a force of 700 N to walk 6 m up a flight of stairs in 6 s, how much power do you use?
a)
19 W
b)
25,200 W
c)
700 W
d)
4,200 W
9.
A machine is a device that can multiply
a)
force.
b)
power.
c)
work.
d)
all of the above
10.
How can a machine make work easier for you?
a)
by decreasing the amount of work you do
b)
by changing the direction of your force and multiplying it
c)
by increasing the work done by the machine
d)
none of the above
11.
The actual mechanical advantage of a machine
a)
cannot be less than 1.
b)
decreases as the input distance increases.
c)
increases with greater friction.
d)
is less than the ideal mechanical advantage of the machine due to friction.
12.
If you know the input distance and the output distance of a machine, which of the following can you calculate?
a)
work
b)
Power
c)
efficiency
d)
ideal mechanical advantage
13.
If you have to apply 40 N of force on a crowbar to lift a rock that weights 400 N, what is the mechanical advantage of the crowbar?
a)
0.1
b)
10
c)
360
d)
16,000
14.
A 120-m long ski lift carries skiers from a station at the foot of a slope to a second station 40 m above. What is the IMA of the lift?
a)
0.3
b)
3
c)
40
d)
160
15.
The efficiency of a machine is always less than 100 percent because
a)
a machine cannot have an IMA greater than 1.
b)
some work input is lost to friction.
c)
the work input is too small.
d)
the work output is too great.
16.
Joe uses a mechanical device that requires 420 J of work to do 230 J of work in lifting a crate. What is the efficiency of the device?
a)
0.5%
b)
190%
c)
55%
d)
183%
17.
A motor with an efficiency of 75 percent must supply 240 J of output. What was the work input?
a)
75 J
b)
180 J
c)
320 J
d)
420 J
18.
An inclined plane reduces the effort force by
a)
increasing the distance through which the forces is applied.
b)
increasing the work.
c)
reducing the effort distance.
d)
reducing the work.
19.
An ax is an example of a(an)
a)
pulley system
b)
lever.
c)
wedge.
d)
wheel and axle.
20.
Which of the following is an example of a wheel and axle?
a)
hammer
b)
an automobile steering wheel
c)
a jar lid
d)
a pencil
21.
The ideal mechanical advantage of a pulley system is equal to the
a)
distance the load has to move.
b)
length of the rope.
c)
number of rope segments supporting the load.
d)
weight of the object being lifted.
22.
Work is a transfer of
a)
energy.
b)
force.
c)
mass.
d)
motion.
23.
The energy of motion is called
a)
kinetic energy.
b)
potential energy.
c)
thermal energy.
d)
work.
24.
Which of the following is an example of an object with kinetic energy?
a)
a wind-up toy that has been wound up
b)
a compressed basketball
c)
a stretched rubber band
d)
a charging linebacker
25.
The energy stored in gasoline is
a)
chemical energy.
b)
electromagnetic energy.
c)
mechanical energy.
d)
nuclear energy.
26.
Heat is the transfer of thermal energy from one object to another because of a difference in
a)
specific heat.
b)
phase.
c)
temperature.
d)
waste heat.
27.
As the temperature of an object rises, so does the
a)
nuclear energy of the object.
b)
mass of the object.
c)
thermal energy of the object.
d)
potential energy of the object.
28.
Which of the following devices is based on the property of thermal expansion?
a)
balance
b)
calorimeter
c)
convection oven
d)
Thermometer
29.
Based on your knowledge of the conservation of energy,
a)
Tigers
b)
Hippos
c)
Ardvarks
d)
Fighting Chickens
30.
Energy from the sun reaches Earth mostly by
a)
Magic
b)
Cables
c)
Radiation.
d)
Conduction
31.
A fire can transfer thermal energy by
a)
conduction.
b)
convection.
c)
radiation.
d)
all the above
32.
Which of the following materials conducts heat well?
a)
glass
b)
plastic
c)
metal
d)
wood
33.
Which point in the diagram has the MOST potential energy?
a)
A
b)
B
c)
C
d)
D
34.
What is the mechanical advantage of the pulley labeled B?
a)
1
b)
2
c)
3
d)
4
e)
5
35.
Identify the type of lever shown:
a)
First Class
b)
Second Class
c)
Third Class
d)
Fourth Class
36.
Identify the energy conversion for B:
a)
Chemical
b)
Mechanical
c)
Thermal
d)
Nuclear
e)
Electromagnetic
37.
Identify the energy conversion for B:
a)
Thermal
b)
Mechanical
c)
Chemical
d)
Nuclear
e)
Electromagnetic
38.
Temperature is the measure of heat energy. This is related to the kinetic energy of particles. When you add energy, or heat up a substance, the particles will
a)
move closer together.
b)
move further apart.
c)
stop moving completely.
d)
become completely solid.
39.

A pulley system is used to lift a 50 kg load to a height of 2 meters. If the system requires 1,200 J of input work, what is the efficiency of the pulley system?

a)

100%

b)

8.2%

c)

12%

d)

82%

40.

Which of the following is an example of a simple machine that changes the direction of a force?

a)

Wheelbarrow

b)

Screw

c)

Pulley

d)

Inclined plane

41.

If you apply a force of 60 N to push a box 5 meters in 10 seconds, what is the power used?

a)

12 W

b)

30 W

c)

300 W

d)

60 W

42.

Which of the following is NOT considered a simple machine?

a)

Lever

b)

Inclined plane

c)

Pulley

d)

Engine

43.

A seesaw is an example of which type of simple machine?

a)

Wheel and axle

b)

Lever

c)

Wedge

d)

Screw

44.

Which simple machine is used to hold objects together or lift them by turning?

a)

Inclined plane

b)

Wedge

c)

Pulley

d)

Screw

45.

What is the formula for calculating the ideal mechanical advantage (IMA) of an inclined plane?

a)

IMA = force output / force input

b)

IMA = height of plane / length of plane

c)

IMA = work output / work input

d)

IMA = length of plane / height of plane

46.

A ramp is 6 meters long and rises 2 meters high. What is the mechanical advantage of the ramp?

a)

0.33

b)

12

c)

8

d)

3

47.

If you use an inclined plane to lift a box weighing 100 N and you only need to apply 40 N of force, what is the actual mechanical advantage?

a)

140

b)

0.4

c)

2.5

d)

60

48.

Which of the following devices converts electrical energy into mechanical energy?

a)

Battery

b)

Electric motor

c)

Light bulb

d)

Solar panel

49.

When a toaster is used, what energy conversion takes place?

a)

Chemical to electrical

b)

Thermal to mechanical

c)

Electrical to thermal

d)

Mechanical to chemical

50.

Which energy conversion occurs in a hydroelectric power plant?

a)

Chemical to electrical

b)

Thermal to mechanical

c)

Electrical to chemical

d)

Mechanical to electrical

51.

Which of the following is an example of kinetic energy?

a)

A stretched rubber band

b)

A moving car

c)

A battery

d)

A book on a shelf

52.

Which type of energy is stored in food?

a)

Electrical energy

b)

Thermal energy

c)

Chemical energy

d)

Mechanical energy

53.

Solar panels convert which type of energy into electrical energy?

a)

Nuclear energy

b)

Electromagnetic energy

c)

Chemical energy

d)

Mechanical energy

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