2008lever

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This document discusses levers and their mechanical advantage. It defines the key parts of a lever including the fulcrum, effort arm, and resistance arm. It describes the three classes of levers and provides examples. First class levers can multiply both force and distance, second class levers multiply force but not distance, and third class levers cannot multiply force since the effort arm is always shorter than the resistance arm.

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Lever, simple machine consisting of a rigid bar that rotates about a fixed point, called a fulcrum. Levers affect the effort, or force, needed to do a certain amount of work, and are used to lift heavy objects. To move an object with a lever, force is applied to one end of the lever, and the object to be moved (referred to as the resistance or load) is usually located at the other end of the lever, with the fulcrum somewhere between the two. By varying the distances between the force and the fulcrum and between the load and the fulcrum, the amount of effort needed to move the load can be decreased, making the job easier. Physicists classify the lever as one of the four simple machines used to do work. (The other three are the pulley, the wheel and axle, and the inclined plane.) Work is defined in physics as the result of a force, such as a person lifting, that moves an object over a distance. A common example of a lever is the seesaw. The human arm is also a lever, where the elbow is the fulcrum and the muscles apply the force.

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2. Levers April 17, 2009

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