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Work And Simple Machines Review
Test Description: Unit 3 Review - Work, power and simple machines
Instructions: Answer all questions to get your test result.
1) If you exert a force of 20 N to push a box 30 m in 25 s, how much work did you do?
A
500 J
B
1.5 J
C
0.67 J
D
600 J
2) In order to do work on an object, the force you exert must be
A
quick
B
the maximum amount of force you are able to exert
C
in the direction opposite to Earth's gravitational force
D
in the same direction as the object's motion
3) Simple machines can do all of the following except
A
increase the amount of work you do
B
change direction
C
decrease the amount of force you exert
D
increase the distance over which you exert a force
4) Pulleys function as simple machines
A
to change the direction of the input force
B
to decrease the height that the object will be raised
C
to reduce the amount of input force needed
D
to increase the distance over which the input force is applied
5) Which of these is an example of work being done on an object?
A
Pushing a car that doesn't move in the snow.
B
A heavy iron doorstop holding a door closed on a windy day.
C
A crane holding a heavy piece of metal at a construction site.
D
Pushing a child on a swing.
6) Why is easier to use a lever to move a large rock?
A
Using the lever allows the wind to help in moving the rock.
B
A lever and fulcrum don't make the work any easier.
C
The action of the fulcrum decreases the amount of work to be done.
D
The lever and fulcrum decrease the amount of force needed to move the rock.
7) In which scenario is the most work performed?
A
The same amount of work is being done in all scenarios.
B
A lady pushes her golf cart with a force of 250 N but it doesn't move.
C
A man pulls a wagon with 1 N of force for 50 m.
D
A boy carries a 5 N package 50 m across the street to her neighbor.
8) Ms. Gibby uses a crowbar to remove a large nail embedded in her deck. She pushes the bar down .5 m with a force of 25 N. The nail moves vertically upward 10 cm. What is the MA of the bar? (pay attention to your units!)
A
1
B
2.5
C
0.1
D
5
9) How much work do you do if you exert a force of 50 N over 2 m?
A
25 W
B
100 W
C
25 J
D
100 J
10) If it takes 500 J of work to move an object 25 m, how much force was exerted?
A
12,500 J
B
12,500 N
C
20J
D
20 N
*select an answer for all questions
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