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Mechanical Systems Review #2

Total questions: 74

Worksheet time: 1hrs 14mins

Name
Class
Date
1.

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

a)
work.
b)
power.
c)
output force.
d)
mechanical advantage.
2.

Mechanical advantage is a measure of how much a machine multiplies the effort

a)
efficiency.
b)
force.
c)
power.
d)
work.
3.

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

4.

A machine with a mechanical advantage greater than 1:

a)

multiplies the effort force so the machine would be good to help move heavy objects.

b)

does not multiply the force, but increases distance and speed.

c)

has no effect on speed or effort force

5.

A machine with a mechanical advantage of less than 1:

a)

multiplies the effort force so the machine would be good to help move heavy objects.

b)

does not multiply the force, but increases distance and speed.

c)

does not affect distance or speed

6.

A machine with a mechanical advantage equal to 1:

a)

multiplies the effort force so the machine would be good to help move heavy objects.

b)

does not multiply the force, but increases distance and speed.

c)

does not affect distance or speed

7.

To increase the mechanical advantage of a lever

a)

make sure the fulcrum is in the middle of the lever

b)

move the fulcrum closer to the load

c)

move the fulcrum closer to the person

d)

use a bigger fulcrum

8.

The mechanical advantage of a lever is greater when the effort arm is...

a)

smaller

b)

longer

c)

just right

9.

Which lever would be the easiest to lift the load?

a)

C

b)

A

c)

B

10.

If a pulley system has a mechanical advantage of 4, what does that mean?

a)

This means that it is 4 times easier to lift this load.

b)

This means you only need a quarter of the effort to lift the load.

c)

For example, if you lifted 100 kg, it would only take 25 kg of effort.

d)

All of the above

11.

What are the units for mechanical advantage?

a)

no units

b)

J

c)

N

d)

%

12.

if a load of a lever is 100 newtons and the force you apply is 20 newtons, what is your mechanical advantage?

a)

2000 N

b)

5

c)

2000

d)

5 N

13.
This pulley
a)
has a mechanical advantage of 1 and does not make work easier.
b)
has mechanical advantage of 2 and reduces the force needed to lift an object.
c)
has a mechanical advantage of 2 and changes the direction of the applied force.
d)
has a mechanical advantage of 1 and changes the direction of the force needed to lift an object.
14.

What is the mechanical advantage of the lever shown?

a)

10

b)

0.1

c)

50

d)

250

15.

What is the mechanical advantage for this lever?

a)

1

b)

2

c)

1/2

d)

8

16.

A lever used to lift a heavy box has an input arm of 4 meters and an output arm of 0.8 meters. What is the mechanical advantage of the lever?

a)

1

b)

2.5

c)

5

d)

10

17.

What is the theoretical mechanical advantage of the following lever?

a)

4

b)

0.25

c)

10

d)

40

18.

What is the theoretical mechanical advantage of the following lever?

a)

3

b)

1200

c)

40

d)

100

19.

What is the theoretical mechanical advantage of the following lever?

a)

4800

b)

80

c)

4

d)

0.33

20.

A fixed pulley has a mechanical advantage equal to 1 because.....

a)

The output force is larger than the input force.

b)

The output force is smaller than the input force.

c)

The output and input force are equal, but the direction of the force changes.

d)

None of the above.

21.

What is energy?

a)

moving energy

b)

stored energy

c)

renewable energy

d)

The ability to do work.

22.

What is the unit for Energy?

a)

no units

b)

Joules

c)

%

d)

N

23.

What is potential energy?

a)

moving energy

b)

stored energy

c)

renewable energy

d)

non renewable energy

24.

What is kinetic energy?

a)

moving energy

b)

potential energy

c)

stored energy

d)

renewable energy

25.
What kind of energy is in a stretched rubber band?
a)
Potential
b)
Kinetic
26.
What kind of energy is in a waving hand?
a)
Potential
b)
Kinetic
27.
The faster an object moves, the ________ kinetic energy it has. 
a)
more
b)
less
c)
none of the above
d)
all of the above 
28.

Which of the following is an example of elastic potential energy?

a)

A ball rolling across the floor

b)

A rubber band that has been stretched

c)

Heat from an oven

d)

Playing the guitar

29.

Which Apple has the greatest Gravitational Potential Energy?

a)

Apple A

b)

Apple B

c)

Apple C

d)

Apple D

30.

At what point does the biker have the greatest Potential Energy?

a)

Point A

b)

Point B

c)

Point C

d)

Point D

31.

At what point does the biker have the greatest Kinetic Energy?

a)

Point A

b)

Point B

c)

Point C

d)

Point D

32.

At what point does Potential Energy transform into Kinetic Energy?

a)

Point A

b)

Point B

c)

Point C

d)

Point D

33.
At which point is potential energy greatest?
a)
W
b)
X
c)
Y
d)
Z
34.

Select the graph that best represents the energy of the skiers in the TOP of the slope.

a)
b)
c)
d)
35.
Which of the following is an exmaple of a change of kinetic energy into gravitational potential energy?
a)
a person parachuting out of a plane
b)
a car racing around an oval track
c)
a person skiing down a hill
d)
a person walking up a hill
36.
If the skier is at the top of the hill waiting for the whistle to blow for his turn to ski, he has ____________, after the whistle blows and he starts his ski run, he has ___________ .
a)
kinetic energy; potential energy
b)
potential energy; friction
c)
kinetic energy; gravity
d)
potential energy; kinetic energy
37.
According to the Law of Conservation of Energy, energy cannot be _________ or ____________. 
a)
destroyed, destroyed
b)
created, saved
c)
created, destroyed
d)
lost, found
38.
What is energy transformation?
a)
a change of energy from one form to another
b)
when energy gets more energy added to it
c)
when energy gets destroyed
d)
a change in intensity
39.

The picture shows what type of transformation

a)

Electrical to mechanical

b)

light to electric

c)

electrical to light

d)

light to light

40.
work transfers
a)
sweat
b)
energy
c)
velocity
d)
effort
41.

what is the two things that need to occur for work to have been done?

a)

force and movement

b)

movement and direction

c)

constant force and power

d)

power and work

42.

what is the unit of work?

a)

Newton

b)

Joule

c)

Watt

d)

meter

43.
A painter lifts a can of paint that weighs 48 Newtons a distance of 3 meters. How would you calculate how much work he does? (work = distance x force)
a)
3m ÷ 48N
b)
48N ÷ 3m
c)
48N × 3m
d)
none of the above
44.

In which scenario is work = 0 J ?

a)

Pushing a stationary wall

b)

Pulling a trolley car

c)

Pushing a book across the table

d)

Dropping a set of keys from a height, h.

45.

Two people shove on a wall with 100 N. The wall doesn’t move. How much work is done?

a)

100J

b)

100N

c)

0J

d)

0N

46.

if you push a cart with a force of 60 N for 2 m... how much work have you done

a)

120 J

b)

30 J

c)

120 N

d)

30 N

47.
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
48.

If 40N of force is applied to Rollo Koster's 10 kg cart over a distance of 50 meters, how much work is done?

a)

8000J

b)

8000N

c)

4000J

d)

2000J

49.
The table shows the force applied and displacement when different boxes are being pushed. Which box shows the most work being done? 
a)
W
b)
X
c)
Y
d)
Z
50.

What is the work input of the following simple machine?

a)

50 N

b)

450 J

c)

450 N

d)

50 J

51.

In using scissors to cut paper, the work input is:

a)

the person moving the scissors to cut paper

b)

the paper being cut

c)

located at the fulcrum

d)

located at the load

52.

What is the work out....

a)

10m x 50N = 500J

b)

1m x 500N = 500J

c)

500N x 10m = 5000J

d)

1m x 50N = 50J

53.

What is the work input of the following simple machine?

a)

7680 J

b)

3000 J

c)

9000 J

d)

2560 J

54.

What is the work output of the following simple machine?

a)

7680 J

b)

3000 J

c)

9000 J

d)

2560 J

55.

A simple machine reduces the amount of work needed to accomplish a task.

a)

true

b)

false

56.

The energy output will always be ______________

a)

less than the energy input

b)

more than the energy input

57.
The efficiency of a machine can be increased by reducing __________________________. 
a)
effort
b)
resistance friction
c)
fulcrum
d)
friction
58.

Why can mechanical efficiency never be 100%?

a)

No machine is strong enough.

b)

Machines are too big to allow for 100% efficiency.

c)

It can be 100%.

d)

Some energy is lost in the form of heat/sound due to friction.

59.

What does friction produce that reduces efficiency?

a)

heat

b)

water

c)

energy

d)

work

60.

How much energy is wasted by a machine if the energy consumed (input) is 263 J and the useful energy (output) is 142 J?

a)

405 J

b)

395 J

c)

121 J

d)

1.85 J

61.

_____________ is a measure of how much of the work is changed into useful work

a)

Efficiency

b)

Energy

c)

Joule

d)

Newton

62.

Which bulb is the most efficient?

a)

Filament bulb

b)

LED light

c)

CFL lamp

63.

You solve a problem and find that you have machine with 150% efficiency. Can your answer be correct?

a)

No, efficiency can never be more than 100%

b)

Yes, the answer can be right.

c)

Not enough information to tell.

64.

What type of energy is useful?

a)
Light
b)

Thermal

c)

Electrical

65.

What is wasted energy?

a)

The energy that is lost to heat or other energy types that aren’t useful.

b)

A comparison of how much energy is used to do work versus how much is lost or wasted to the environment.

c)

The energy that you throw away.

d)

The total amount of energy put into a system.

66.
A machine has a work output of 8 joules and requires 10 joules of work input to operate. What is the machine's efficiency?
a)
8 J
b)
10 J
c)
80%
d)
800%
67.

Total energy = 34000J
Useful energy = 340J

Workout the efficiency of this vintage VW Beetle.
 efficiency = useful energytotal energy in ×100%efficiency\ =\ \frac{useful\ energy}{total\ energy\ in}\ \times100\%  

a)

100%

b)

10%

c)

40%

d)

20%

68.

An assembly line machine needs 150 J of input work to do 90 J of output work. What is the efficiency of the machine?

a)

167%

b)

.6%

c)

60%

d)

1.67%

69.

The efficiency of this light bulb is

a)

40 %

b)

60 %

c)

100 %

d)

1.67 %

e)

0.0167 %

70.

When a kettle is used to boil some water, the total input energy is 80 J. 25 J of the total input energy is wasted by the kettle. The efficiency of the kettle is ____%

a)

69%

b)

50%

c)

75%

d)

80%

71.

A TV uses 200 J of electricity and transforms it into 125 J of sound and light and 75 J of heat. How efficient is it?

a)

62.5%

b)

.625%

c)

37.5%

d)

.375%

72.

What is the efficiency of the ramp?

a)

500J/500J x 100% = 100% J

b)

500J/500J x100% = 100%

c)

50J/5000J x100% = 1%

d)

5000J/50J x100% = 10,000%

73.

What is the efficiency of the following simple machine?

a)

85%

b)

3%

c)

33%

d)

39%

74.

What happens to the overall efficiency of a machine as I add more machines?

a)

For each simple machine you add, the overall efficiency increases because it gets faster.

b)

For each simple machine you add, the overall efficiency decreases.

c)

The overall efficiency is divided in half for every simple machine you add.

d)

There is no connection.

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