Introduction to Machines

Question 1

What does a machine change to make work easier? Select three options.the amount of work donethe amount of force appliedthe time needed to do the workthe direction of a forcethe distance over which a force is applied

Revolt · Accepted Answer

the amount of force applied; the direction of a force; the distance over which a force is applied

Question 2

Mechanical advantage is the ratio of . Efficiency is the ratio of expressed as a percentage.

Revolt · Accepted Answer

output force/input force; Selection 1: output force/input force; Selection 2: output work/input work

Question 3

Question 3

Revolt · Accepted Answer

64560

Question 4

A car jack with a mechanical advantage of 6 needs to produce an output force of 600 N to raise a car. What input force is required?

Revolt · Accepted Answer

100 N

Question 5

Question 5

Revolt · Accepted Answer

64561

Question 6

Anouk does 150 J of work using a hammer to pull a nail out of a piece of wood, and the hammer does 105 J of work on the nail. What is the efficiency of the hammer?

Revolt · Accepted Answer

70%

Question 7

AB✔ CThey all have the same efficiency.

Revolt · Accepted Answer

C

Question 8

Select the correct words from the drop-down menus to complete the sentence. The work of a machine can never exceed the work because uses some of the work.

Revolt · Accepted Answer

Selection 1: output; Selection 2: input; Selection 3: friction

Question 9

The efficiency of a machine can be increased by

Revolt · Accepted Answer

reducing friction.

Question 10

If a machine has 100% efficiency, it means that

Revolt · Accepted Answer

output work is equal to input work.

Introduction to Machines Answers

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