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## PowerPoint Slideshow about ' Machines' - kylia

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### Machines

Simple And Complex Machines

- Simple machine- A machine that changes the amount of force put in to motion, normally making a job easier
- There are 6 simple machines: lever, pulley, wheel and axle, inclined plane, screw, and wedge.
- A complex machine is made out of 2 or more simple machines (ex. Bicycle or an axe)

Lever

- A lever is a simple machine that helps to lift weights.
- An example of a lever is a hammer when pulling out a screw, a can opener, fishing rod, etc..
- To calculate the Mechanical advantage you divide the effort arm by the resistance arm

Pulley

- Pulleys are used to reduce the amount of force needed to lift a load, uses a groove and a rope.
- Pulleys are used on ships to lift and lower a sail.
- The mechanical advantage of a pulley is found by dividing the output force by the input force

Wheel and axle

- A wheel and axle is a lever that rotates around the fulcrum, the larger wheel rotates around the smaller wheel (axle)
- An example of a wheel and axle is a Ferris wheel.
- The mechanical advantage is found by dividing the radius of the wheel by the radius of the axle.

Inclined Plane

- An inclined planes is a flat, slanted surface used to raise an object
- A commonly used example is a ramp used to lift heavy objects into trucks.
- To find the mechanical advantage you divide the length by the height

Screw

- A screw is a shaft with a groove or thread formed around the surface.
- The more threading on the surface the greater the mechanical advantage.
- Screws can raise weights, or press and fasten objects.
- Ex: Archimedes water pump, or just a plain screw

Wedge

- A wedge is shaped like an inclined plane, and is normally used to separate or hold.
- Ex: you can take a strong wedge and slam it into a log and break the wood.
- Another example is a shovel or a knife splitting something open.
- The mechanical advantage is found by dividing the length of the slope by the thickness at the big end.

Carly Carlson1st periodExtra credit project 5/22/10

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