Simple Machines

simple machine is a mechanical device that changes the direction or magnitude of a force.  In general, they can be defined as the simplest mechanisms that use mechanical advantage (also called leverage) to multiply force.  A simple machine uses a single applied force to do work against a single load force.

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pulley, also called a sheave or a drum, is a mechanism composed of a wheel on an axle or shaft that may have a groove between two flanges around its circumference.  A rope, cable, belt, or chain usually runs over the wheel and inside the groove, if present. Pulleys are used to change the direction of an applied force, transmit rotational motion, or realize a mechanical advantage in either a linear or rotational system of motion. It is one of the six simple machines. Two or more pulleys together are called a block and tackle.

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     A lever (from French lever, "to raise", c.f. a levant) is a rigid object that is used with an appropriate fulcrum or pivot point to multiply the mechanical force (effort) that can be applied to another object (load). This leverage is also termed mechanical advantage, and is one example of the principle of moments. A lever is one of the six simple machines.

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Incline plane

      The inclined plane is one of the original six simple machines; as the name suggests, it is a flat surface whose endpoints are at different heights. By moving an object up an inclined plane rather than completely vertical, the amount of force required is reduced, at the expense of increasing the distance the object must travel.

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How does it work, simple machines


Use the principal of work to explain how simple machines work.  Make sure you follow the guidelines below.

1. The report must be one page in length.


2. A diagram of each of the simple machines and how the principal work is used in the simple machine. 

3. The work equation and an example how the work equation is used in one of the simple machines