How Levers Work

1. Simple machine: a device with few parts that makes it easier to do work.
2. effort force: the force applied to a machine.
3. resistance force: the force that a machine acts against.
4. lever: a simple machine made of rigid bar on a pivot point.
5. fulcrum: the pivot point of a lever.
6. mechanical advantage: the number of time a machine multiplies the force applied.
7. pulley: a grooved wheel that turns by the action of a rope in the groove.
8. wheel and axle: a simple machine mada of a handle or axis attached to the center a wheel.