AnswersPBCSD_Grade_Forgiveness_2003310_Physical Science_S2_2022Energy Transformations

Simple Machines Answers

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1
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Which is a result of using a machine?

A
The mechanical advantage makes the work output greater than the work input.
B
The machine can put out force without having any force applied to it.
C
A large force can be exerted through a long distance to have a small force exerted through a short distance.
D
A large force can be exerted through a short distance to have a small force exerted through a long distance.
2
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Which statement best describes why a machine is useful?

A
A machine does a greater amount of work than the amount of work that is done on it.
B
A machine does a smaller amount of work than the amount of work that is done on it.
C
A machine can decrease both the input force and the input distance needed to do a given amount of work.
D
A machine can decrease either the input force or the input distance needed to do a given amount of work.
3

A machine has a mechanical advantage of 5. What force should be applied to the machine to make it apply 3000 N to an object?

A
0.002 N
B
600 N
C
3000 N
D
15,000 N
4

A machine has an efficiency of 70%. How much work does the machine do when 20,000 J of work is done on it?

A
14,000 J
B
28,600 J
C
1,400,000 J
D
2,860,000 J
5

What is the mechanical advantage of a machine that applies a force of 1000 N to an object when a force of 500 N is applied to the machine?

A
0.5
B
2
C
500
D
1500

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