| A | B |
|---|
| simple machine | one of six kinds of tools with few or not moving parts that makes work easier |
| energy | the ability to do work |
| work | something done whenever a force makes an object move through a distance |
| force | a push or pull |
| gravity | the force that makes objects pull towards each other |
| friction | the force caused by two objects rubbing together that slows down or stops moving objects |
| push | a force that moves an object in the same direction |
| pull | a force that moves an object in the opposite direction |
