| A | B |
|---|
| physics | study of matter and energy, forces and motion |
| motion | to change place or position |
| force | push or pull |
| force described by | strength and direction |
| velocity | describes object's speed and direction |
| Speed = | distance divided by time |
| speed | magnitude of velocity expressed in distance covered per unit of time |
| Aristotle | said heavier objects fall faster than lighter objects |
| Galileo | all things fall at the same rate |
| Forces working on falling objects | gravity and air resistance |
| Force = | Mass x acceleration |
| Newton | force required to accelerate an object with a mass of 1 kilogram at rate of 1 meter per second, per second |
