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Work, Power and Simple Machines Review

Total questions: 50

Worksheet time: 25mins

Name
Class
Date
1.
When a machine is used to do work, the work done by the machine is called the ______________.
a)
Resistance force
b)
Effort force
c)
Input work
d)
Output work
2.
For an ideal machine, work output is _______________ than work input.
a)
Greater
b)
Less
c)
The same
3.
Some machines increase the force and some machines change the ____________ of the force.
a)
Direction
b)
Resistance
c)
Efficiency
d)
Joules
4.
A pair of scissors is a ______ class lever.
a)
1st
b)
2nd
c)
3rd
5.
In order for work to be done on an object, the object must ______________. 
a)
Move
b)
Change direction
c)
Be forced
6.
All machines are less than 100% efficient because of __________.
a)
Friction
b)
Energy
c)
Work
7.
A door is an example of a _________ class lever. 
a)
1st
b)
2nd
c)
3rd
8.
A slanted surface used to raise an object is a(n) _____________
a)
effort ramp
b)
screw
c)
inclined plane
d)
efficiency board
9.
A bar that is free to pivot about a fixed point is a __________.
a)
Ramp
b)
Lever
c)
Screw
d)
Fulcrum
10.
The rate at which work is done is called __________
a)
Effort time
b)
Efficiency
c)
Force
d)
Power
11.
The number of times a machine multiplies effort force is called the ___________
a)
Resistance force
b)
Mechanical advantage
c)
Efficiency force
d)
Fulcrum
12.
An inclined plane wrapped around a cylinder is a ____________.
a)
Block and tackle
b)
Screw
c)
Lever
d)
Ramp
13.
A machine that only __________ has a mechanical advantage of 1.
a)
changes direction
b)
increases force
c)
increases distance
14.
A winding mountain road and a ramp are examples of a(n) ___________.
a)
Lever
b)
Wheel and axle
c)
Inclined plane
d)
Block and tackle
15.
The unit of power is the ___________.
a)
Second
b)
m/s
c)
Watt
d)
Joule
16.
A machine with a mechanical advantage greater than 1 is used to ___________
a)
increase force
b)
increase force and change direction
c)
increase distance
d)
change direction
17.
What supplies the effort force in the work input?
a)
Machine
b)
All of the above
c)
Mechanical advantage
d)
You
18.
Which is not an example of a pulley?
a)
Flag pole
b)
Mini blinds
c)
Wheelbarrow
d)
Elevator
19.
If the MA=7, how many times is the effort force multiplied?
a)
7
b)
10
c)
5
d)
3
20.
What is the disadvantage to using a screw?
a)
longer distance
b)
smaller distance
c)
more force
d)
less force
21.
Which machine would make the work the easiest?
a)
MA=2
b)
MA=4
c)
MA=6
d)
MA=8
22.
What happens to the MA of a wedge as it becomes longer and thinner?
a)
Increases
b)
Decreases
c)
Nothing
d)
Remains the same 
23.
Which force keeps a machine from being 100% efficient?
a)
Gravity
b)
Friction
c)
Air resistance
d)
Weight
24.
The resistance force is often the ____________ of the object being moved.
a)
mass
b)
force
c)
weight
d)
gravity
25.
A force of 5,000N is applied to a stationary wall. How much work is performed?
a)
5000
b)
50000
c)
0
d)
1
26.
An ant does 2J of work while dragging a 0.20N grain of sugar. How far does the ant drag the sugar?
a)
10
b)
0.4
c)
0.1
d)
2.20
27.
A bulldozer performs 8,000 J of work pushing dirt a distance of 32 m. What is the total force exerted by the bulldozer?
a)
250
b)
256000
c)
0.004
d)
5
28.
A measure of how much input turns into output
a)
Efficiency
b)
Effort force
c)
Mechanical advantage
d)
Fulcrum
29.
Number of times a machine multiplies effort force
a)
Efficiency
b)
Mechanical advantage
c)
Power
d)
Work
30.
Instrument that makes work easier
a)
Simple machine
b)
Joules
c)
Resistance force
d)
Effort force
31.
The force you apply to a simple machine
a)
Effort force
b)
Resistance force
c)
Work
d)
Work input
32.
A device made up of 2 or more simple machines
a)
Compound machine
b)
Fulcrum
c)
Power
d)
Work
33.
A fixed point on a lever
a)
Fulcrum
b)
Compound machine
c)
Work input
d)
Resistance force
34.
Work that goes into a machine
a)
Work input
b)
Work output
c)
Effort force
d)
Resistance force
35.
Unit of work
a)
Joule
b)
Watt
c)
Meter
d)
Second
36.
Work done by a machine
a)
Work input
b)
Work output
c)
Resistance force
d)
Effort force
37.
A force acting through a distance
a)
Work
b)
Power
c)
Compound machine
d)
Efficiency
38.

What type of machine is this?

a)

1st Class Lever

b)

2nd Class Lever

c)

3rd Class Lever

39.

Which of the following would be an example of a wedge:

a)

a knife

b)

stairs

c)

a skateboard

d)

a broom

40.

Which of these would show the most power

a)

picking up a light object in a long amount of time

b)

holding a heavy object for a long time

c)

picking up a heavy object in a short amount of time

d)

picking up a light object in a short amount of time

41.

Which of the following shows work being done:

a)

pushing a wall

b)

holding a box

c)

picking up a pencil

d)

sitting in a chair

42.

A lever turns back and forth on the __________________.

a)

chain

b)

load

c)

effort

d)

fulcrum

43.

Workers push a heavy box up an inclined plane and onto a moving truck. Which best explains why these workers use an inclined plane?

a)

It makes their work easier because it requires less effort.

b)

It decreases the amount of work they have to do.

c)

It increases the amount of friction necessary to do the task.

d)

It makes the box weigh less.

44.

A doorknob is a simple machine made up of 2 circular objects of different sizes. When turning a doorknob, what type of simple machine is being used?

a)

inclined plane

b)

wheel and axle

c)

wedge

d)

pulley

45.

Which of the following is NOT one of the things a machine can do?

a)

Changes the amount of force required.

b)

Changes the distance over which the force is exerted.

c)

Changes the direction of the force.

d)

Changes the amount of work done.

46.
3. Which type of lever is this?
a)

First Class Lever

b)

Second Class Lever

c)

Third Class Lever

47.

What type of lever

a)

First Class Lever

b)

Second Class Lever

c)

Third Class Lever

48.

What class lever does this picture show?

a)

1st

b)

2nd

c)

3rd

49.

Which lever would be the easiest to lift the load?

a)

A

b)

B

c)

C

50.

Third class levers always require more force to lift something. Why should we use them?

a)

They increase the distance over which the force acts.

b)

They change the direction of the force.

c)

They make it easier to lift something.

d)

They have a large IMA

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