Simple Machines Answers

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Which is a result of using a machine?

The mechanical advantage makes the work output greater than the work input.

The machine can put out force without having any force applied to it.

A large force can be exerted through a long distance to have a small force exerted through a short distance.

A large force can be exerted through a short distance to have a small force exerted through a long distance.

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Which statement best describes why a machine is useful?

A machine does a greater amount of work than the amount of work that is done on it.

A machine does a smaller amount of work than the amount of work that is done on it.

A machine can decrease both the input force and the input distance needed to do a given amount of work.

A machine can decrease either the input force or the input distance needed to do a given amount of work.

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?

0.002 N

600 N

3000 N

15,000 N

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

14,000 J

28,600 J

1,400,000 J

2,860,000 J

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?

0.5

500

1500

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