| A | B |
|---|
| frame of reference | objects that remain stationary as things move around them ex. platform to train |
| SI for distance | meters or kilometers |
| relative motion | movement in relation to a frame of reference: speeding car from corner or other moving car |
| distance | total length of paths taken between two points |
| displacement | direction and length of line drawn between starting and ending points |
| vector | quantity with magnitude and direction |
| magitude | length of a vector |
| resultant vector | vector sum of two or more vectors |
| displacement = 0 | trip around a roller coaster starting point is ending point |
| speed | distance divided by time |
| average speed | speed of entire trip with fast and slow elements |
| instantaneous speed | speed at one particular instant |
| slope of a line | speed( distance -time graph) |
| velocity | speed and direction of a motion |
| acceleration | changes in speed and/or changes in direction |
| free fall | movement of an object toward earth because of gravity |
| constant acceleration | a steady change in velocity: a plane taking off |
| deceleration | a negative slope in a speed time graph; |
| 9.8 m/s | objects in a free fall accelerate at this rate |
