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Warm up Draw the 3 different types of levers..

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Presentation on theme: "Warm up Draw the 3 different types of levers.."— Presentation transcript:

1 Warm up Draw the 3 different types of levers.

2 What is work? Work is equal to the force applied times the distance the over which the force is applied.

3 How is the amount of work measured?
When you push a box with a force of 1N a distance of one meter, you have accomplished 1joule of work. What is a joule? 1 joule = 1 N·m

4 How are force and distance related in machines?
In a simple machine the work input is always equal to or greater than the work output. In order to produce a large output force with a small input force the input force is applied over a longer distance

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6 What is efficiency? Efficiency is the ratio of work output to work input. Efficiency = Wo/Wi In real machines work output is always less than work input due to friction.

7 The rate work is done is called power.
Power is work (joules) ÷ time (seconds) P=W/t The Unit for power is watt. 1watt = 1 joule/second

8 The End


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