What is a machine? Explain the differences between simple and complex machines. [3 Marks]

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Solution

A machine is a device that helps us do more work with less effort in less time. [1 Mark]

Differences between simple and complex machines:

Simple machine Complex machine

A machine with few or no moving parts that is used to make work easier. A machine that is a combination of two or more simple machines.

Example: Wedge, inclined plane, screw, etc. Example: Car, refrigerator, sewing machine, etc.

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Simple machine	Complex machine
A machine with few or no moving parts that is used to make work easier.	A machine that is a combination of two or more simple machines.
Example: Wedge, inclined plane, screw, etc.	Example: Car, refrigerator, sewing machine, etc.