| A | B |
|---|
| work | the result of a force moving an object |
| simple machine | a machine made of one or two parts |
| compound machine | a machine made of two or more simple machines |
| complex machine | a macine made of many simple and compound machines |
| force | a push or pull on an object that can cause it to change motion |
| gravity | a force that pulls any two objects toward one another |
| inertia | the tendency of a moving object to stay in motion or a resting object to stay at rest |
| friction | a force that slows moving objects |
