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POE Unit 1 Practice Test

Total questions: 38

Worksheet time: 1hrs 16mins

Name
Class
Date
1.
Which simple machine is NOT found in the object?
a)
lever
b)
wedge
c)
wheel and axle
d)
inclined plane
2.
What are the units of force called?
a)
newtons
b)
joules
c)
work
d)
meters
3.
If simple machines reduce the force needed to move an object, what trade-off must be made?
a)
increase the amount of work
b)
decrease the amount of work
c)
increase the distance the force is applied
d)
decrease the distance the force is applied
4.
A flat sloping surface that connects lower and higher elevations. It makes raising objects easier.  
a)
wedge
b)
screw
c)
lever
d)
inclined plane 
5.

Which is a first class lever?

a)
b)
c)
6.

Which is a third class lever?

a)
b)
c)
7.
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
8.
Which simple machine will have a mechanical advantage less than 1?
a)
crane
b)
weight machine
c)
a windmill
d)
a conveyer belt
9.
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
10.

What is the ideal mechanical advantage of the following pulley?

a)

1

b)

2

c)

4

d)

6

11.

What is the ideal mechanical advantage of the following pulley?

a)

1

b)

2

c)

4

d)

6

12.
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
13.

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

a)

2.4

b)

3.4

c)

4.4

14.

A type of simple machine that includes an inclined plane wrapped around a cylinder

a)

Screw

b)

Lever

c)

Wheel & Axle

d)

Wedge

15.
What can a gear train do?
a)
Change output direction
b)
Change force
c)
Change speed
d)
All of these
16.
If gear A rotates once, how many times will gear D rotate?
a)
1/16
b)
4
c)
1/4
d)
1/2
17.
What is the gear ratio?
a)
2
b)
3
c)
5
d)
6
18.
What type of gear train is this?
a)
Simple Gear Train
b)
Compound Gear Train
19.
A simple gear train is composed of three gears.  Gear A is the driver gear and has 16 teeth, B has 24 teeth, and C has 8 teeth.  If C is the output, what is the gear ratio?
a)
0.33
b)
0.5
c)
1.5
d)
2
20.
Pulley B, which has a diameter of 16 inches, is being driven by pulley A, which has a diameter of 4 inches.  If pulley A is spinning at 60 RPMs, then pulley B is spinning at _________________________  RPMs.
a)
4
b)
15
c)
64
d)
240
21.
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
22.
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? Remember, FeDe = FrDr
a)
 900 N
b)
4 N
c)
2.25 N
d)
  100 N
23.

A wheelbarrow is carrying 50 lb of cement.  The radius of the wheel is 10 inches and the radius of the axel is 4 inches.  What effort force is needed to move the cement if the wheel is driving the axle?  Remember FeDe = FrDr

a)
12.5 lb
b)
125 lb
c)
4 lb
d)
20 lb
24.

What is the efficiency of the following pulley system?

a)

88%

b)

100%

c)

91%

d)

81%

25.

What is the efficiency of the following pulley system?

a)

80%

b)

93%

c)

79%

d)

74%

26.

The ratio of useful energy output to the total energy input, or the percentage of the work input that is converted to work output.

a)

Efficiency

b)

Work

c)

Effort

d)

Resistance

27.

The fixed point around which a lever rotates.

a)

Pivot

b)

Fulcrum

c)

Base

d)

Floor

28.

Ratio of distances traveled by the applied effort and resistance force within a system.

a)

Ideal Mechanical Advantage

b)

Actual Mechanical Advantage

29.

A gear positioned between the driver and the driven gear used to change rotational direction.

a)

Idler Gear

b)

Transfer Gear

c)

Pulley

d)

Sprocket

30.

A condition where there are no net external forces acting upon a particle or rigid body and the body remains at rest or continues at a constant velocity.

a)

Imbalance

b)

Force

c)

Absolute Zero

d)

Static Equilibrium

31.

Energy which a body possesses by virtue of being in motion.

a)

Kinetic Energy

b)

Static Energy

c)

Static Equilibrium

d)

Potential Energy

32.

Explain the concept of energy transfer.

a)

Energy transfer involves the conversion of energy from one form to another or the movement of energy from one object to another.

b)

Energy transfer involves the movement of energy from one object to another without any change in form.

c)

Energy transfer only occurs in living organisms.

d)

Energy transfer is the process of converting matter into energy.

33.

How is power calculated in a mechanical system?

a)

Power = Time x Distance / Force

b)

Power = Force x Time / Distance

c)

Power = Distance x Time / Force

d)

Power = Force x Distance / Time

34.

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

35.

Machines can be made more efficient by ____________.

a)

Increasing input

b)

Decreasing energy

c)

Increasing friction

d)

Reducing friction

36.
What is the equation for work
a)
W = F x D
b)
F = M x A
c)
y = mx + b
d)
25 eevee eggs equals one evolution
37.
If a person lifts a 150 Newton ball 1.5m.  And it takes him 17 seconds.  How much work did he complete?  
a)
225 Joules
b)
3876 Watts
c)
10 Joules
d)
387.6 Watts
38.

If a car weighs 3000 N and drives a distance of 10 m in 2 seconds, how much power does it use?

a)

1,500 J

b)

60,000 W

c)

15,000 W

d)

6,000 J

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