1. By Carly Carlson

2. 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)

3. 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

4. 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

5. 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.

6. 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

7. 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

8. 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.

9. Carly Carlson 1 st period Extra credit project 5/22/10