| A | B |
|---|
| Friction | Force that holds back the movement of an object. |
| Traction | Friction between two objects that keeps them from sliding across each other. |
| Adhesion | The sticking together of two different materials |
| Cohesion | The sticking together of the same material |
| Lubricant | Substance that reduces friction. |
| Drag | Friction as object moves through air or water. |
| Aerodynamic | Shaped object allowing air/water to move around it with reduced drag. |
| Gravity | Pull toward the center of an object. |
| Law of Universal gravitation | The closer the objects are to one another, the more powerful the attraction. |
| Terminal velocity | When the force of friction and gravity cancelled each other out on a falling object. |
| Centripetal Force | A force acting on an object moving in a circular path and is directed toward the enter of moving path. |
