| A | B |
|---|
| Speed | Distance per unit time (m/s) |
| Velocity | Distance per unit time and a direction (m/s South) |
| Acceleration | Change in velocity per unit time (m/s^2 South) |
| Force | A push or pull on an object (mass * acceleration) |
| Net force | The combination of all the forces acting on an object |
| Balanced forces | Forces acting on an object that combine and firm a net force of zero; no change in motion |
| Unbalanced forces | Forces acting on an object that combine and form a net force that is NOT zero; change in motion |
| Momentum | A measure of how difficult it is to stop a moving object |
| Inertia | Tendency for an object to maintain its motion unless acted upon by an outside force. |
| Terminal velocity | When the force of air resistance upward is equal to the force of gravity downward |
| Force pairs | The forces two objects apply to each other. |
