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Lever

Lever. By: Olivia and Kari. Machine. Our machine is the Lever. A lever is a rigid bar that is free to move around a fixed point. How Does it work?. There are three types of lever.

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Lever

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  1. Lever By: Olivia and Kari

  2. Machine • Our machine is the Lever. • A lever is a rigid bar that is free to move around a fixed point.

  3. How Does it work? • There are three types of lever. • The first lever is called First-Class Levers. For an example a screwdriver being used as a first-class lever to open a paint can. • The second lever is called Second-Class Lever. For an example is a wheelbarrow, it rotates around its fulcrum. • The third lever is called Third-Class Lever. The output distance over which the third-class lever exerts its force is always larger than the input distance you move the lever through.

  4. This is what a lever looks like.

  5. What is it used for. • It can be used for your wheelbarrows. • A screwdriver with a paint can. • You sweeping the ground.

  6. How do you calculate IMA for your machine? • To Calculate the ideal mechanical advantage of any lever, divide the input arm by the output arm.

  7. Other important information • The word lever came from the French. • The earliest remaining writings regarding levers date from the 3rd century BC and were provided by Archimedes. "Give me a place to stand, and I shall move the earth." is a remark of Archimedes who formally stated the correct mathematical principle of levers (quoted by Pappus of Alexandria).

  8. Reference • http://en.wikipedia.org/wiki/Lever • Physical Science Concepts in Action

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