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:'''Theory'''-
::Simple machines are used to create a mechanical advantage. They do this by reducing the amount of force needed to accomplish a job. The list of machines usually includes the following machines
:::'''Inclined plane'''- It takes less force to push a load up a slope than lift it straight up.
:::'''Wheel and axle'''- The wheel is arguably the most important machine. It reduces the amount of frictional forces.
:::'''Lever'''-Is composed of a fulcrum or pivot point and a long rigid bar or beam. The closer the object that we are lifting is to the fulcrum the easier (More mechanical advantage we have.
:::'''Pulley'''-Is a wheel that is used with a rope to change the direction of a force. Multiple pulleys can be used together to create a block and tackle that will increase the mechanical advantage.
:::'''Wedge'''-This machine is just two inclined planes, but is usually included because it is so useful.
:::'''Screw'''-This is simply a circular inclined plane, but because it takes a rotational force and turns it into a linear force, it is almost always included in a list of simple machines.

Translations:Adventist Youth Honors Answer Book/Health and Science/Physics/159/en - Revision history

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