What Are Simple Machines?

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Presentation transcript:

What Are Simple Machines? What are the six types of simple machines? The six types of simple machines are the simple lever, the pulley, the wheel and axle, the simple inclined plane, the wedge, and the screw.

What Are Simple Machines?, continued Simple machines are divided into two families: the lever family and the inclined plane family. Lever family: simple lever pulley wheel and axle Inclined plane family: simple inclined plane wedge screw

The Lever Family What are the two principal parts of all levers? All levers have a rigid arm that turns around a point called the fulcrum. Levers are divided into three classes.

The Lever Family, continued

The Lever Family, continued Pulleys are modified levers. A wheel and axle is a lever or pulley connected to a shaft. The point in the middle of a pulley is like the fulcrum of a lever. The rest of the pulley behaves like the rigid arm of a first-class lever. Screwdrivers and cranks are common wheel-and-axel machines.

The Mechanical Advantage of Pulleys

The Inclined Plane Family How does using an inclined plane change the force required to do work? Pushing an object up an inclined plane requires less input force than lifting the same object does.

The Inclined Plane Family A wedge is a modified inclined plane. A screw is an inclined plane wrapped around a cylinder.

Compound Machines What simple machines make up a pair of scissors? A pair of scissors uses two first-class levers joined at a common fulcrum; each lever arm has a wedge that cuts into the paper. compound machine: a machine made of more than one simple machine

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