Mechanical Advantage and Efficiency

Which of the following is an example of a lever?

• screwdriver

• wrench

• seesaw

• hammer

A pulley is a simple machine that uses a wheel and a ________ to lift or move objects.

• rope

• cable

• belt

• chain

Which of the following is an example of a wedge?

• screwdriver

• hammer

• axe

• saw

A lever can be used to:

• Control temperature or measure distance.

• Increase speed or reduce friction.

• Generate electricity or store energy.

• Amplify force or change the direction of a force

An inclined plane makes it easier to:

• move objects left or right

• move objects in a circular motion

• move objects in a straight line

• move objects up or down

Tags

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A wedge is used to:

• split or separate objects

• measure objects

• hold objects together

• cut or slice objects

Efficiency is calculated by dividing the ________ by the ________ and multiplying by 100.

• work output/input

• force output/input

• Fxd

• work input/output

Tags

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Which of the following is true about mechanical advantage?

• MA is the ratio between work output and work input

• MA is the ratio of force produced by a machine compared to force put into the machine

• MA describes how much work is done by a machine

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Simple machines decrease the amount of work that needs to be done.

• True

• False

Answer explanation

Machines make work easier, but they do not lesson the amount of work that needs to be done..

The efficiency of a machine will never be 100%

• True

• False

Tags

NGSS.HS-PS3-4