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Work/EFF/MA/Power (Test Review)

Total questions: 38

Worksheet time: 2hrs 56mins

Name
Class
Date
1.
How much work is being done with 200 N of force over 426 meters?
a)
85,200 J
b)
45,620 J
c)
90,480 J
d)
62,329 J
2.
If 150 Joules of work is needed to move a box 10 meters, what force was used? 
a)
1500 N
b)
15 N
c)
1.5 N
d)
150 N
3.

Which of the following is the best example of work being done.

a)

doing homework

b)

lifting a box

c)

pushing a stationary box

d)

holding a box

4.
The amount of work done in a certain amount of time is known as 
a)
work
b)
effort force
c)
resistance force 
d)
power
5.
The SI Unit for Mass?
a)
Kilogram (Kg)
b)
Newton (N)
c)
Joule (J)
d)
Watt (W)
6.
The SI Unit for Work
a)
Newton (N)
b)
Joule (J)
c)
Second (s)
d)
Watt (W)
7.
The SI Unit for Force
a)
Newton (N)
b)
Joule (J)
c)
Second (s)
d)
Watt (W)
8.
The SI Unit for Time
a)
Newton (N)
b)
Joule (J)
c)
Second (s)
d)
Watt (W)
9.
The SI Unit for Power
a)
Newton (N)
b)
Joule (J)
c)
Second (s)
d)
Watt (W)
10.
What is the formula for Power?
a)
E=mc2
b)
W= F x d
c)
P = W/T
11.
An Xbox consumes 15.7 watts while in standby mode. If you leave it in standby mode for 86,400 seconds (one day), how much work was done?
a)
1,356,490 J
b)
1,356,480 J
c)
1,356,470 J
d)
1,356,460 J
12.
How far does a car that weighs 5,000 N go if 18,000 J of work is done on it?
a)
3.8 m
b)
3.7 m
c)
3.2 m
d)
3.6 m
13.
A person weighing 600 N gets on an elevator. The elevator lifts the person 6 m in 10 seconds.  How much power was used?
a)
360 W 
b)
60 W
c)
3600 W
d)
600 W
14.

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

15.

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 that is exerted by a machine

c)

the force the machine exerts on a object

d)

the output work times the input distance

16.

The input force of 11 N acting on the effort arm of a lever moves 0.4 m, which lifts a 40 N weight resting on the resistance arm a distance of 0.1 m. What is the efficiency of the machine?

a)

87

b)

91

c)

85

d)

98

17.

What is effort (input) distance?

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 distance an input force acts through

d)

the output work times the input distance

18.

What is resistance (output) distance?

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 distance an input force moves a machine

d)

the distance through which the output force is exerted

19.
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
20.
What is the mechanical advantage of this pulley system?
a)
2
b)
3
c)
4
d)
5
21.

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 (MA=Output Force/Input Force)?

a)

1

b)

10

c)

100

d)

1000

22.

The mechanical advantage of this inclined plane is...(MA=Resistance Force/Effort Force)

a)

2.4

b)

3.4

c)

4.4

23.
How can you determine the mechanical advantage of a pulley system?
a)
Count the number of rope/cable segments on each side of the pulleys, including the free end. If the free end is to be pulled down, subtract 1 from this number.
b)
Count the number of rope/cable segments on each side of the pulleys without including the free end.
c)
Count the number of rope/cable segments on the central pulleys.
d)
Count the number of rope/cable segments on each side of the pulleys, including the free end. If the free end is to be pulled down, subtract 10 from this number.
24.
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
25.
How can you decrease the effort force needed to push a weight to the top of the ramp? 
a)
cover the surface with carpet
b)
increase the length of the ramp
c)
increase the height of the ramp
d)
decrease the length of the ramp
26.
The amount by which a machine multiplies input force is known as the 
a)
work.
b)
power.
c)
output force.
d)
mechanical advantage.
27.
The amount by which a machine multiplies input force is known as the 
a)
work.
b)
power.
c)
output force.
d)
mechanical advantage.
28.
A sales clerk at a local hardware store sells you a hammer with a mechanical advantage of 10 when used to pry up nails. You are able to create a force of 60 N. Using the hammer, what would be the maximum force that could be generated to remove a nail?
a)
0.167 N
b)
6 N 
c)
600 N
d)
6000 N
29.
A lever and fulcrum are used to lift a fallen tree, which has a weight of 480 N. If the lever has a mechanical advantage of 5.5, what is the input force that will begin lifting the tree off the ground?
a)
5.5 N
b)
40.7 N
c)
87.3 N
d)
2640 N
30.
Power is a measure of how much ______ can be done in a set amount of ______.
a)
Work, Time
b)
Work, Energy
c)
Energy, Force
d)
Force, Work
31.
Efficiency is a ______ of what you put in versus what you get out of a system.
a)
source
b)
ratio
c)
multiplication
d)
addition
32.

a man expends 100J of work to move a box up an inclined plain. The amount of work produced is 80J. What is the man's efficiency?

a)

40%

b)

80%

c)

20%

d)

800%

33.

What is the equation for MA

a)

Fr/Fe

b)

Fe/Fr

c)

de/dr

d)

dr/de

34.

What is the equation for IMA

a)

Fr/Fe

b)

dr/de

c)

de/dr

d)

Fe/Fr

35.

What is the equation for efficiency

a)

Eff=(MAIMA)×100%Eff=\left(\frac{MA}{IMA}\right)\times100\%

b)

Eff=(Fr÷IMA)×100%Eff=\left(Fr\div IMA\right)\times100\%

c)

Eff=(IMAMA100%)Eff=\left(\frac{IMA}{MA}100\%\right)

d)

Eff=MA100%×IMAEff=\frac{MA}{100\%}\times IMA

36.

If a machine has a mechanical advantage is 8 and the ideal mechanical advantage is 12, what is the efficiency of the machine

a)

.66666

b)

52%

c)

66.66%

d)

70%

37.

Two people lift a heavy box a distance of 15 m. They use ropes, each of which make an angle of 15 degrees with the vertical. Each person exerts a force of 225 N. How much work is done by the ropes

a)

3.29 x 103 J

b)

6.5 x 103 J

c)

4.0 x 104 N

d)

2.45 x 102 J

38.

A rope is used to pull a metal box a distance of 15.0 m across the floor. The rope is held at an angle of 46 degrees with the floor, and a force of 628 N is applied to the rope. How much work does the rope do on the box.

a)

6.54 x 103 N

b)

6.77 x 103 J

c)

5.34 x 103 J

d)

6.54 x 10 3 J

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