| A | B |
|---|
| motion | when the Distance from another object is changing. |
| reference point | a place or object that can be used to determine if an object is in motion |
| should reference point be moving | no reference point is stationary |
| Speed = | Distance/Time |
| Units to express speed | m/h or m/s or km/min |
| Acceleration | rate at which velocity is changing |
| Force | Push or pull exerted on an object |
| Does every force cause acceleration | no every force does not |
| Unbalanced forces | cause motion |
| Balanced forces | do not cause motion, net force is 0 |
| Average speed | total distance traveled divided by total time traveled |
| velocity | speed in a given direction, N,S,E,W, or up and down |
| acceleration | the rate at which velocity changes; increasing or decreasing speed, or direction change |
| formula for acceleration | acceleration equals end speed minus beginning speed divided by time. |
| net force | all forces working on an object |
| friction | the force two surfaces exert on each other when rubbed together |
| gravity | a force that pulls objects towards each other |
| mass | the amount of matter in an object |
| weight | measure of the force of gravity on an object |
| free fall | when only gravity is acting on an object causing acceleration |
| air resistance | a type of fluid friction that makes an upward force on falling objects |
