# Machines - PowerPoint PPT Presentation

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By Carly Carlson. 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.

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Machines

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By Carly Carlson

## 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.