| A | B |
|---|
| gravity | the earth's gravitational pull |
| gravitation | the force of attraction between all objects that tends to pull them toward one another |
| Isaac Newton | mathematically described the force of gravitation |
| Galileo | explained that all objects fall to earth with the same acceleration if gravity is the only force acting on the objects |
| acceleration | the rate at which the velocity of an object changes per unit time |
| velocity | the speed and direction of an object |
| weight | caused by the force of gravity pulling on an object |
| G | gravitational constant calculated by Isaac Newton |
