| A | B |
|---|
| force | push or pull on an object |
| gravity | force that pulls two objects toward one another |
| inertia | object staying in motion or at rest |
| friction | force that slows or stops moving objects |
| work | when a force moves an object |
| simple machine | machine made of one or two parts |
| inclined plane | flat surface one end higher than the other |
| wheel and axle | wheel attached to a rod |
| lever | beam that pivots on a fulcrum |
| wedge | inclined plane that splits objects apart |
| screw | inclined plane wrapped around a rod, holds objects together |
| wheel and axle | wheel turns, causing the rod attached to turn |
| pulley | rope and wheel makes heavy loads easier to lift. |
| compound machines | machine made of two or more simiple machines |
| fulcrum | changes direction of force in a lever |
| energy | ability to do work |
| potential energy | energy an object has because of position |
| kinetic energy | energy of motion |
| mechanical energy | energy because it can move or is moving |
| chemical energy | energy from chemical changes |
| electrical energy | energy from the flow of electricity |
