Answers LHS Physical Science Unit Test — Unit testQuestion 19

19

QuizMultiple Choice

Unit Test — Unit test

Question 19 • LHS Physical Science

Which statement describes how a machine can help make work easier?

Answer

A

It can put out more force than the input force by decreasing the distance over which force is applied.

B

It can increase the amount of work performed if the output force is in the same direction as the input force.

C

It can apply a greater output force over a greater distance compared to the input force and distance.

D

It can increase the distance over which output force acts by applying less output force than input force.

Explanation

A machine can trade distance for force: it can produce a greater output force, but that force acts over a shorter distance. This does not increase the total work; in an ideal machine, input work equals output work. Choice A describes this force-distance trade-off.

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