| A | B |
|---|
| Gravity | Attractive force between any two objects with mass |
| Mass | The amount of matter in a substance |
| Weight | The gravitational force exerted on an object. |
| Friction | Force that resists the motion of two surfaces that are touching |
| Static | The force that prevents surfaces from sliding past each other. |
| Sliding | The force that opposes the motion of surfaces sliding past each other. |
| Rolling | The force between a rolling object and a surface |
| Fluid | The force between a surface and a fluid |
