| A | B |
|---|
| noncontact force | pulls on objects without touching them or having contact with them |
| friction | the force that resists the movement of objects against each other |
| contact force | two objects in contact with each other |
| work | when an object is moved through a distance |
| force | a push or a pull |
| position | an object's location |
| motion | a change of position |
| machine | any object that makes work easier |
| simple machine | an object that makes work easier and has no or ony a few moving parts |
| effort | the force applied to cause a simple mahine to work |
