Free Printable MA, EFF

1.

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

2.

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

3.

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

4.

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

5.

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

6.

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

7.

What is the mechanical advantage of this pulley system?

a)

2

b)

3

c)

4

d)

5

8.

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

9.

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

a)

2.4

b)

3.4

c)

4.4

10.

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.

11.

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

12.

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

13.

The amount by which a machine multiplies input force is known as the

a)

work.

b)

power.

c)

output force.

d)

mechanical advantage.

14.

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

15.

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

16.

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

17.

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

18.

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

19.

Efficiency is a ______ of what you put in versus what you get out of a system.

a)

source

b)

ratio

c)

multiplication

d)

addition

20.

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%

21.

What is the equation for MA

a)

Fr/Fe

b)

Fe/Fr

c)

de/dr

d)

dr/de

22.

What is the equation for IMA

a)

Fr/Fe

b)

dr/de

c)

de/dr

d)

Fe/Fr

23.

What is the equation for efficiency

a)

$Eff=\left(\frac{MA}{IMA}\right)\times100\%$

b)

$Eff=\left(Fr\div IMA\right)\times100\%$

c)

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

d)

$Eff=\frac{MA}{100\%}\times IMA$

24.

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%

MA, EFF

Total questions: 24

Worksheet time: 3hrs 1mins

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