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POE EOC Review (SM, MA, W, T, P, Eff, E, and Gears)

Total questions: 66

Worksheet time: 3hrs 36mins

Name
Class
Date
1.

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

2.

Which mechanical advantage would increase your force?

a)

1

b)

2

c)

0.5

d)

All of the above

3.
A simple machine is a device that helps to reduce the amount of _____ required to work.
a)
force
b)
energy
c)
work
4.

A ramp has a mechanical advantage of 4. If it is 15 feet long, how high is it?

a)

3.75 ft

b)

60 ft

c)

11 ft

d)

not enough information to solve

5.

Robert is using an inclined plane to move a heavy box into a truck bed that is two meters off the ground. Which of the inclined planes should Robert use to get the greatest mechanical advantage?

a)

b)

c)

d)

6.

You push down on a lever with a force of 100 N to lift a 500 N box.

What is the mechanical advantage of the lever?

(a)  

7.

A screw has a mechanical advantage (MA) of 12.5 and a diameter of 0.4 inch. What is the pitch of the screw?

Include units.

(a)  

8.

Calculate the MA for a screw with these dimensions.

Diameter: 1.5 cm, Pitch: 0.25 cm

a)

18.84

b)

6

c)

16.97

d)
10
9.

The Wheel has a radius of 2 feet and the axle has a radius of 6 inches.

What is the MA?

a)
4
b)
3
c)
2
d)
5
10.

At what distance should a 2N load placed from the pivot so that the see saw won't move?

a)
0.45m
b)
0.2m
c)
0.6m
d)
0.75m
11.

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
12.

What is the gear ratio for this gear train?

a)

1:1

b)

2:1

c)

1:2

d)

10:20

13.

What is the gear ratio for this gear train?

a)

3:1

b)

1:3

c)

4:1

d)

1:4

14.

If the gear ratio for a gear train is 5:1, is the input gear bigger or smaller than the output gear?

a)

Bigger

b)

Smaller

15.

If the gear ratio for a gear train is 1:8, is the input gear bigger or smaller than the output gear?

a)

Bigger

b)

Smaller

16.

If the input gear is bigger than the output gear, ____ will be increased.

a)

Speed

b)

Torque

17.

If the output gear is bigger than the input gear, ____ will be increased.

a)

Speed

b)

Torque

18.

What's the ratio?

Make sure ratio is reduced

a)

1:1

b)

84 : 60

c)

60 : 36

d)

5 : 3

19.

# of teeth output gear = 30

# of teeth input gear = 60

What is the gear ratio (in lowest terms)?

a)

1 : 2

b)

30 : 60

c)

2 : 1

d)

60 : 30

20.

_________have NO EFFECT on Gear Ratio or Gear Reduction, regardless of the number of teeth they have.

a)

Idler Gears

b)

Driven Gears

c)

Driving Gears

21.

All gears in between the driving gear and the driven gear that only transmit power are known as ______

a)

Idler Gears

b)

Trained Gears

c)

Driven Gears

d)

Driving Gears

22.

The idler gear allows the driven and driving gears to rotate in the same _______

a)

speed

b)

way

c)

direction

d)

momentum

23.

The rpm of the bigger gear is always ______ than the rpm of the smaller gear.

a)

slower

b)

faster

c)

more

d)

less

24.

Gears locked together on the same shaft will always turn in the same _______ and at the same rpm.

a)

speed

b)

torque

c)

direction

d)

momentum

25.

When you have a system with a driving gear that is LARGER than the driven gear you will increase Speed and decrease _____

a)

speed

b)

ratio

c)

Momentum

d)

Torque

26.

Compoud machines are made up of at least ___ simple machines.

a)

2

b)

1

c)

4

d)

7

27.

Which is not an inclined plane?

a)

stairs

b)

ramp

c)

ladder

d)

knife

28.

Machines can be made more efficient by ____________.

a)

Increasing input

b)

Decreasing energy

c)

Increasing friction

d)

Reducing friction

29.

You do 20 J of work in pushing a crate up a ramp. If the output work from the inclined plane is 11 J, then what is the efficiency of the inclined plane?

a)

55%

b)

45%

c)

55J

d)

55N

30.

A system uses a lever with MA = 3.0 to apply effort to a pulley block & tackle with MA = 4.0. What is the overall ideal mechanical advantage of the compound machine?

(a)  

31.

A wheel & axle (MA = 5.0) is attached so that a lever that has MA = 2.0 applies effort to the wheel. What force multiplication (overall MA) does the user get?

(a)  

32.

A load is pulled up an incline (MA = 4.0) by a rope that goes through a movable pulley providing MA = 4.0 (neglect losses). What effort reduction does the student get (overall MA)?

(a)  

33.

A machine has theoretical (ideal) MA = 10.0 but actual measured input force vs output force indicates the real MA = 7.5. What is the machine efficiency (use percent)?

(a)  

34.

A first-class lever has the effort arm = 1.80 m and the load arm = 0.45 m. That lever applies effort to a movable pulley system that has 5 supporting rope segments.
What is the combined ideal MA?

(a)  

35.

An inclined plane is 6.0 m long and raises a load to a height of 1.5 m. The load is then attached to a wheel & axle: wheel radius = 30 cm, axle radius = 5 cm. What is the combined MA?

(a)  

36.

A wheel radius = 0.40 m and axle radius = 8 cm. The wheel connects to a lever whose effort arm = 0.9 m and load arm = 0.3 m. What is the combined MA?

(a)  

37.

A system has: a movable pulley supported by 4 rope segments and a fixed single pulley at the top used only to change direction (does not change MA). Then that output attaches to a second movable pulley with 2 supporting rope segments. What is the overall MA (ignore friction)?

(a)  

38.

Load is on an incline 10.0 m long raising a height of 2.0 m. The rope to pull the load goes through a block & tackle that provides 5 supporting strands. What is the combined MA?

(a)  

39.

A lever has effort arm 0.75 m and load arm 0.25 m. That lever pushes a small cart up an inclined plane of length 2.5 m and height 0.5 m. What is the combined MA?

(a)  

40.

A hand crank attaches to a large wheel radius 0.25 m and small axle radius 0.05 m (first stage). That axle is rigidly connected to a second stage where a wheel radius 0.12 m drives a final axle radius 0.02 m. What is the overall MA (force multiplication)?

(a)  

41.
A 16 N force is applied to an object and 96 J of work is done. How far was the object moved?
a)
6 m
b)
16 m 
c)
80 m 
d)
1536 m 
42.
Is this an example of work?
A teacher applies a force to a wall and becomes exhausted.
a)
True
b)
False
43.

the rate at which work is done

a)

power

b)

work

c)

machine

d)

efficiency

44.
How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes?
a)
15 J
b)
45 J
c)
0 J
d)
5 J
45.
45,000 Joules of work done in 90 seconds results in how much power?
a)
50 watts
b)
500 watts
c)
5000 watts
d)
4,050,000 watts
46.
A wrench is used to tighten a nut. A 15N perpendicular force is applied 50cm away from the axis of rotation, and moves a distance of 10 cm as it turns. What is the torque applied to the wrench?
a)
7.5 Nm
b)
1.5 Nm
c)
750 Nm
d)
150 Nm
47.
What is the Unit for Torque
a)
Nm
b)
N
c)
W
d)
J
48.
Torque is the product of a force exerted on an object times the lever arm.
a)
True 
b)
False
49.
If the torque required to loosen a nut on the wheel of a car has a magnitude of 60.0 N• m, what minimum perpendicular force must be exerted by a mechanic at the end of a 45.0 cm wrench to loosen the nut?
a)
.666 Nm
b)
 133.3 N
c)
66.7 N
d)
13.3 Nm
50.
Which will produce more torque to loosen the lug nut?
a)
A
b)
B
c)
They are the same
51.

Which symbol represent the physics quantity of torque?

a)
Ω
b)
Δ
c)
∑
d)

τ\tau

52.
What is the distance the masses on the right of the fulcrum need to be to balance with the two masses on the left?
a)
.65 m
b)
.56 m
c)
.79 m
d)
.39 m
53.
A seesaw is unbalanced with two people of different masses sitting equal distances from the center. Which of the following will result in equilibrium?
a)
The larger person moving further away from the center.
b)
Moving the smaller person closer to the center.
c)
Moving the smaller person further from the center.
d)
Making the larger person do nothing.
54.
Will the torque be increased by using the rope?
a)
A - Yes
b)
B - No
55.
Energy due to motion is ____________ energy. 
a)
Potential 
b)
Energy
c)
Kinetic
d)
Friction
56.
The faster an object moves, the ________ kinetic energy it has. 
a)
more
b)
less
c)
none of the above
d)
all of the above 
57.
Calculate the potential energy of a rock with a mass of 55 kg as it sits on a cliff that is 27 m high.
a)
1485 J
b)
13468 J
c)
14553 J
d)
1289 J
58.
If a crane lifts a small car 15 meters using 25,000 joules of work in 5 seconds, how much power was generated by the crane?
a)
375, 000 Watts
b)
1,667 Watts
c)
75 Watts
d)
5,000 Watts
59.
Which of the following objects has the most kinetic energy?
a)
A 20 kg toddler running at 5 m/s
b)
A 50 kg toddler running at  30 m/s
c)
A 90 kg toddler running at 30 m/s
d)
A 100 kg  toddler running at 2 m/s
60.

What is the formula to calculate the potential energy of an object raised to a height?

a)

PE = mgh

b)

PE = mv2

c)

PE = 1/2 kx2

d)

PE = mgh2

61.

What is the formula to calculate the kinetic energy of an object?

a)

K = mgh

b)

K = 1/2 mv2

c)

K = 1/2 kx2

d)

K = mgh2

62.
In which of these cases is work being done? 
a)
A student sleeps
b)
A student pushes a locked door that does not move
c)
a student carries his chair into another room
d)
A student sits on the carpet
63.

What is an example of a force?

a)

Energy

b)

Power

c)

Pressure

d)

Weight

64.

If you increase your work and decrease your time, you will have

a)

more power

b)

less power

c)

same amount of power

d)

power rating can not be determined

65.
Which of these is a measurement of power?
a)
100 joules
b)
100 watts
c)
100 meters per second
d)
100 hertz
66.

In which case is work being done?

a)

A

b)

B

c)

C

d)

D

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