Hi, here are some videos on simple machines. Some of the terms used in the videos can be unfamiliar to you but dun worry, you just need to know the concept behind the simple machines.
Inclined plane: http://www.youtube.com/watch?v=pG_kT565-XQ&feature=related
Lever: http://www.youtube.com/watch?v=wV1pYkTtsxg&feature=related
Pulley: http://www.youtube.com/watch?v=TlPWy7qW7oM&feature=related
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