| A | B |
|---|
| potential energy | the energy stored in an object or material |
| gravitational potential energy | the potential energy of an object located above the ground |
| kinetic energy | the energy of a moving object |
| work | force applied to an object times the distance the object moves |
| simple machine | a device with few parts that makes it easier to do work |
| effort force | the force applied to a machine |
| resistance force | the force that a machine acts against |
| lever | a simple machine made of a rigid bar on a pivot point |
| fulcrum | the pivot point of a lever |
| mechanical advantage | the number of times a machine multipies the force applied |
| pulley | a grooved 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 |
| inclined plane | a straight slanted surface that is not moved when it is used |
| screw | an inclined plane wrapped around a center bar |
| wedge | one or a combination of two inclined planes that is moved when used |
| compound machines | combination of two or more machines |
| efficiency | a ratio of the work done by a machine compared with the work put into the machine |
