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PS Unit 9 Review

Total questions: 71

Worksheet time: 3hrs 43mins

Name
Class
Date
1.
How is work defined?
a)
the amount of energy 
b)
the transfer of force over a distance
c)
rate of work in a given time
d)
the change in distance in a given time
2.
What is the equation for force?
a)
F= mass × acceleration
b)
F = mass × distance
c)
F= distance/time
d)
F = mass/time 
3.
What is the equation for work?
a)
W = mass * acceleration
b)
W = force * distance
c)
W = force/distance
d)
W = speed/time
4.
What is the unit of measurement for work?
a)
Newtons
b)
Joules 
c)
Watts
d)
Meters
5.
Which of the following is an example of work being done?
a)
Teacher sitting in a chair
b)
Book resting on desk
c)
Keys hanging from a key chain
d)
A ball being rolled on the floor
6.
Which of the following IS NOT an example of work being done?
a)
Pushing a cart in a store
b)
Shooting a basketball
c)
A stand off in tug of war
d)
Running a mile
7.
If a student uses 10 Newtons of Force to push a chair 5 meters, how much is work is being done?
a)
2 Joules
b)
.5 Joules
c)
50 Joules
d)
20 Newtons
8.
If a boulder is lifted by a forklift a distance of 10 meters with a force of 30 Newtons. How much work is being done?
a)
.333 Joules
b)
3 Joules
c)
300 Joules
d)
60 Joules
9.
If a bowling ball weighing 5 kg is dropped from a 30 meter tall building, how much work is being done if the acceleration due to gravity is 9.8 m/s^2 (Hint: F = m*a) 
a)
1,470 Joules
b)
150 Joules
c)
49 Joules
d)
294 Joules
10.
If a lion drags his prey 10 meters to his den doing 500 joules of work, how much force did he use?
a)
50 Newtons
b)
500 Joules
c)
50,000 Newtons
d)
10 Newtons
11.
It takes 20 N of force to move a box a distance of 10 m. How much work is done on the box ?
a)
200 J
b)
20.0J
c)
2 J
d)
200 N
12.
Two factors that determine work are
a)
amount of the force, and effort used
b)
amount of the force, and type of force
c)
mass, and distance
d)
amount of force and distance moved
13.
You apply a force of 18 N to a dresser and move it 3.0 m. How much work did you do on the dresser?
a)
54 N
b)
6.0 J
c)
54 J
d)
27 J
14.
The unit or label for work is
a)
netwons
b)
joules
c)
meters
d)
seconds
15.
if you push a cart with a force of 60 N resulting in 120 J of work.. how far did you move the cart? 
a)
7200 m
b)
0 m
c)
2 N 
d)
2 m
16.
 Work done = Force x blank?
a)
a. distance
b)
b. acceleration
c)
c. velocity
d)
d. speed
17.
A force of 15 newtons is used to push a box along the floor a distance of 3 meters.  How much work was done?
a)
3 J
b)
45 J
18.
It took 50 joules to push a chair 5 meters across the floor. With what force wast the chair pushed?
a)
250N
b)
10N
19.
A force of 100 newtons was necessary to lift a rock.  A total of 150 joules of work was done.  How far was the rock lifted?
a)
1.5m
b)
15,000 m
20.

The units for Power are

a)

Joules

b)

Joules/sec

c)

watts

d)

amps

21.

A hair dryer uses 720,000 J of energy in 5 minutes. Calculate the power of the hair dryer.

a)

3,600,000 w

b)

144,000 w

c)

12,000 w

d)

2,400 w

22.

If a 13w bulb is left on for 30 minutes, how much energy is used?

a)

390 J

b)

1800 J

c)

23,400 J

d)

1,404,000 J

23.

A 50w flood light is used outside. How long does it need to be on to use 100,000 J of energy?

a)

5,000,000 s

b)

5,000 s

c)

2,000 s

d)

200 s

24.
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

25.
You move an 8-newton weight five meters in 4 seconds. How much power have you generated?
a)

160 watts

b)

10 watts

c)

6.4 watts

d)

17 watts

26.
How much time is needed to produce 720 Joules of work if 90 watts of power is used? 
a)
0.125 s
b)
8 s
c)
64800 s
d)
80 s
27.

What is effort (input) force?

a)

the force one exerts on a machine

b)

the force which an effort force must overcome in order to do work on an object via a simple machine.

c)

the force the machine exerts on a object

d)

the output work times the input distance

28.
Lamar Gant, U.S. powerlifting star, became the first man to deadlift five times his own body weight in 1985. Deadlifting involves raising a loaded barbell from the floor to a position above the head with outstretched arms. Determine the work done by Lamar in deadlifting 300 kg to a height of 0.90 m above the ground (W=Fd).
a)
270 J
b)
2646 J
c)
333 J
d)
3.00X10-3 J
29.
How is work defined?
a)
the amount of energy 
b)
the transfer of force over a distance
c)
rate of work in a given time
d)
the change in distance in a given time
30.
What is the equation for mechanical advantage?
a)
MA=input force*output force
b)
MA=output force/input force
c)
MA=input force/output force
d)
MA= output force - input force
31.
if a load of a lever is 100 newtons and the force you apply is 20 newtons, what is your mechanical advantage?
a)
120 N
b)
5 N
c)
2000 N
d)
80 N
32.
The amount by which a machine multiplies input force is known as the 
a)
work.
b)
power.
c)
output force.
d)
mechanical advantage.
33.

the percentage of the input work that is converted to output work

a)

mechanical advantage

b)

efficiency

c)

joule

d)

machine

34.
The efficiency of a machine can be increased by reducing __________________________. 
a)
effort
b)
resistance friction
c)
fulcrum
d)
friction
35.
Force is a _____ or _______
a)
simple    complex
b)
push     pull
c)
up      down
d)
in      out
36.

The _________ of a machine is always less than 100%.

a)

mechanical advantage

b)

friction

c)

force

d)

efficiency

37.
All simple machines help make work _________.
a)
harder
b)
smaller
c)
lighter
d)
easier
38.

What is mechanical advantage?

a)

The advantage a machine has over a bicycle

b)

A measure of how much a simple machine reduces work

c)

A measure of when is the best time to use a simple machine

d)

the number of times a machine increases input force

39.

A 62 kg box is lifted 12 m off the ground. How much work was done? (hint: calculate weight of the box first)

a)

5.17 J

b)

72.91 J

c)

744 J

d)

7291.2 J

40.
What is the mechanical advantage of this pulley system?
a)
2
b)
3
c)
4
d)
5
41.
Using a lever, Joe is able to lift a 10,000 N car off of the ground with a force of 1000 N. What is the mechanical advantage of the lever?
a)
1
b)
10
c)
100
d)
1000
42.
How does a single fixed puled, like the one seen here, help you do work?
a)
changes the direction of the force
b)
increases the amount of applied force
c)
decreases the amount of applied force
d)
allows you to pull the rope a shorter distance
43.
Where should the fulcrum be placed in order for the student to use the least amount of effort possible? 
a)
point A
b)
point B
c)
point C
d)
point D
44.

The mechanical advantage of this inclined plane is.....

a)

8

b)

3

c)

48

45.
Jeff is a landscaping contractor and lifts a rock weighing 600 pounds by wedging a board under the rock. Jeff weighs 150 pounds and puts all of his weight on the lever. How much mechanical advantage did the lever provide to Jeff in lifting the rock?
a)
0
b)
2
c)
4
d)
8
46.

What is the primary mechanical advantage of using the simple machine seen in the image?

a)

You can apply a large force and have it move over a very long distance.

b)

You can apply a long distance and have it convert into a very short distance.

c)

You can apply a short distance and have it multiplied to move over a large distance.

d)

You can apply a small force to move something that normally requires a large force.

47.

The diameter of an axle is 4 meters and the wheel diameter is 8 meters. What is the mechanical advantage?

a)

2

b)

32

c)

.5

48.
What is the mechanical advantage for the inclined plane?
a)
5
b)
1/5
c)
45
d)
17
49.
How do you calculate the MA of an inclined plane?
a)
height / length
b)
input X  height
c)
length / height
d)
output X length
50.
How do you calculate the MA of a wheel and axle?
a)
radius of wheel / radius of axle
b)
diameter of axle X diameter of wheel
c)
radius of wheel X radius of axle
d)
Radius of axle / diameter of wheel 
51.
The units for MA are called
a)
Joules
b)
Watts
c)
newtons
d)
MA is a ratio so it does not have units
52.
If the weight of the block is 10N, how much force does one have to apply to lift it using this pulley (MA=2)?
a)
2N
b)
5N
c)
10N
d)
15N
53.
Barbie sits on one end of a see-saw and Ken sits on the other. Barbie goes up in the air and Ken stays down on the ground. In order for Ken to make Barbie move down, he should
a)
stand on the board
b)
push down on the board
c)
move towards the center
d)
move away from the center
54.
A screwdriver is an example of a wheel and axle, which is a type of simple machine. The mechanical advantage of a wheel and axle is the ratio of the radius of the wheel to the radius of the axle. The force required to turn a screw can be reduced by
a)
reducing the length of the axle.
b)
increasing the radius of the axle.
c)
reducing the length of the handle.
d)
increasing the radius of the handle.
55.

This 2000 N weight is raised 1 meter by pulling 4 meters of rope. What force was required to pull the rope?
a)
500 N
b)
1000 N
c)
2000 N
d)
8000 N
56.
Identify this simple machine
a)
Lever
b)
Wheel & Axle
c)
Inclined Plane
d)
Screw
57.
Two examples of a pulley...
a)
knife & axe blade
b)
lightbulb & screw
c)
flagpole hoist & window blinds
d)
catapult & teeter totter
58.
Which of the following does a simple machine do?
a)
allows the users to apply less force over a longer distance
b)
reduce the amount of force needed to do work
c)
change the direction of the applied force
d)
all of the above
59.
An inclined plane wrapped around a rod forms this simple machine 
a)
lever
b)
pulley
c)
screw
d)
wedge 
60.
A simple machine that consists a rigid bar that pivot about a fixed point
a)
lever
b)
pulley
c)
wheel and axle
d)
fulcrum 
61.
A seesaw is an example of a  
a)
wedge
b)
lever 
c)
inclined plane 
d)
pulley 
62.
This device
a)
wedge
b)
lever
c)
incline plane
d)
wheel and axle
63.
What is effort (input) force?
a)
the force required by a machine in order to accomplish work (the force you put on the machine)
b)
the force which an effort force must overcome in order to do work on an object via a simple machine.
c)
the force the machine exerts on a object
d)
the output work times the input distance
64.
What is resistance (output) force?
a)
the force required by a machine in order to accomplish work (the force you put on the machine)
b)
the force which an effort force must overcome in order to do work on an object via a simple machine.
c)
the force the machine exerts on a object
d)
the output work times the input distance
65.
The mechanical advantage of this inclined plane is.....
a)
2.4
b)
3.4
c)
4.4
66.
Mechanical Advantage (MA) is:
a)
Ratio of the magnitude of the resistance and effort forces
b)
Ratio of distance traveled by the effort and the resistance force
c)
All of the above
d)
None of the above
67.
If MA is greater than 1:
a)
Proportionally less effort force is required to overcome the resistance force
b)
Proportionally greater effort force is required to overcome the resistance force
c)
Proportionally less effort distance is required to overcome the resistance force
d)
MA cannot be greater than 1
68.

An inclined plane is 15 meters long and raises 3 meter high. If you want to push a 20 N box up the inclined plane, how much effort force will you need?

a)

900 N

b)

4 N

c)

2.25 N

d)

100 N

69.
A pulley brings a 100 kg piano up into a second story window.  What is the ideal mechanical advantage if the pulley has 5 strands?
a)
20
b)
500
c)
5
d)
0.05
70.

A wheelbarrow is carrying 50.0N of cement. The radius of the wheel is 10 cm and the radius of the axel is 4 cm. What effort force is needed to move the cement

a)

12.5 lb

b)

125 lb

c)

4 lb

d)

20 lb

71.

A wheelbarrow is carrying 50.0N of cement. The distance the cement is to the wheel is 45cm and distance the handles are the wheel is 3m. What effort force is needed to move the cement

a)

12.5N

b)

7.5N

c)

330N

d)

75N

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