how levers work

simple machine: a device with few parts that makes it easier to do work

effort force: the force applied to do a machine

resistance force: the force that a machine acts again

lever: a simple machine made of a rigid bar on a pivot point

fulcrom: the pivot point of a lever

mechanical advantage: the number of times a machine multiplies the force applied

pulley: a groove wheel that turns by the action of a rope in the groove

wheel and axle: a simple machine made of a handle or axis attached to the center of a wheel