How to build moveable parts. 6 simple mechanisms Inclined Plane Lever Pulley Screw Wedge Wheel and Axle.

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Presentation transcript:

How to build moveable parts

6 simple mechanisms Inclined Plane Lever Pulley Screw Wedge Wheel and Axle

Pulley A pulley is a rope wrapped around a wheel. It changes the direction of force. A basic compound pulley has a rope attached to a stationary point looped around one wheel and then around a second wheel. Pulling on the rope pulls the two wheels closer together.

lever The lever has two important parts. The lever itself and the fulcrum. The placement of the fulcrum determines how far the levered object will move, and how much force is required to move it. If a weight was resting on a lever a person could lift the weight by pressing on the lever on the other side. The farther away from the fulcrum that person pressed, the less force that person would need to apply. In order to lift the weight the same distance, the force would have to be applied over a longer distance. In science, we call how much effort it takes to move something a certain distance "work." With a lever, you always do the same amount of work no matter how long your lever is. But if you are moving the lever further, then you don't have to push as hard to do the same amount of work.

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