| A | B |
|---|
| speed | how fast, = distance/time |
| instantaneous speed | how fast at an instant in time |
| average speed | total distance/total time interval |
| velocity | how fast and in what direction |
| velocity vector | show velocity as an arrow, length indicates how fast, direction indicates which way |
| resultant | the single vector you get by adding two other vectors |
| acceleration | rate at which velocity changes with time, = (vf-vi)/t |
| free-fall | motion if only gravity is acting, no air resistance |
| protractor | tool for measuring angles |
| parallelogram rule | graphical method of adding vectors |
| vector | a quantity described by a magnitude (how much) and a direction (which way) |
| g | acceleration of gravity ~ 10 m/s/s at surface of the Earth |
| meters | possible units for distance |
| m/s | possible units for velocity |
| m/s/s | possible units for acceleration |
| 5 m | distance an object will fall from rest in 1 second in free fall |
| 10 m/s | speed of a dropped object after falling for one second in free fall |
| 10 m/s/s | acceleration of a tossed up object at the top of its trajectory |
| 0 m/s | speed of a tossed up object at the top of its trajectory |
