| A | B |
|---|
| Friction | a force that works in the opposite direction of intended motion |
| adhesive | a substance that increases friction |
| lubricant | a substance that reduces friction |
| static friction | force that must be overcome to begin moving |
| dynamic friction | force resisting motion in a moving body |
| normal force | a force perpendicular to the surface |
| free body diagram | illustration of all forces acting on an object |
| sliding friction | friction between two flat surfaces |
| rolling friction | friction between one or more rounded surfaces |
| coefficient of friction | the force of friction divided by the normal force |
| ยต | Greek letter mu, represents the coefficient of friciton |
| entropy | wasted energy, usually in the form of heat |
| weight formula | mass x gravity |
| dynamic | moving |
