| A | B |
|---|
| Speed | How fast the position of an object changes. |
| Velocity | An object's speed in a certain direction. |
| Acceleration | A change in a velocity in a certain amount of time. |
| Gravity | How much an object weighs depends on its mass and the force of__________. |
| Inertia | An object's tendency to resist a change in motion. |
| Weight | An astronaut on the moon has the same mass as she did on Earth, but has less ________. |
| Reaction | For every action, there is an equal but opposite________. |
| Balance Forces | Pushes or pulls which completely cancel one another out. |
| Force | A push or pull that acts on an object. |
| Unbalanced Forces | PUshes or pulls which are not cancelled by other pushes or pulls. |
