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Question

Which of the following are examples of simple machines?


A

Lever

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B

Pulley

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C

Inclined plane

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D

engine

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Solution

The correct options are
A

Lever


B

Pulley


C

Inclined plane


A simple machine is a fundamental device that reduces human effort. There are six types (lever, pulley, inclined plane, wheel & axle, wedge and screw) of simple machines.
A lever reduces the human efforts by the aid of a rigid rod that rotates about a fixed point.
A pulley helps in lifting a heavy load by means of a fixed wheel which changes the direction of effort.
An inclined plane is helpful in taking a heavy load to the desired height since it aids for movement in a direction that is comfortable for humans.

A complex machine is a machine that consists of more than one simple machines working together. An engine is an example of a complex machine.


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