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 * Introduction**

A **simple machine** is a mechanical device that changes the direction or magnitude of a [|force]. In general, they can be defined as the simplest mechanisms that use [|mechanical advantage] (also called [|leverage]) to multiply force. A simple machine uses a single applied force to do [|work] against a single load force. Ignoring [|friction] losses, the work done on the load is equal to the work done by the applied force. They can be used to increase the amount of the output force, at the cost of a proportional decrease in the distance moved by the load. The ratio of the output to the input force is called the mechanical advantage. Usually the term refers to the six classical simple machines that are:
 * [|Lever]
 * [|Wheel and axle]
 * [|Pulley]
 * [|Inclined plane]
 * [|Wedge]
 * [|Screw]

Lesson Objectives:

At the end of the lesson, you should be able to:
 * 1: identify and classify the six different forms of simple machines,
 * 2: cite examples of simple machines in your environment and explain how they work.


 * Activities**

media type="custom" key="9278636"
 * 1) 1. View the following video clip to have a brief understanding of simple machines.

http://www.neok12.com/Simple-Machines.htm
 * 1) 2. Click on the following link to view more examples of how simple machines work.

in action and explain which simple machines they are and how they work.
 * 1) 3. Take photographs or videos of yourself using three different types of simple machines

(that is your register number) in this WiKi.
 * 1) 4. Submit your work by attaching your photos or videos according to the page number