| Flap 1 |
Flap 2 |
| gravity |
a force that act to pull pairs of objects together |
| mass |
the amount of matter in objets. |
| weight |
a force gravity exerts on an ojects mass. |
| acceleration |
rate of change in speed or direction or of movement |
| friction |
a force that resist the movement of one surface past another surface. |
| airresistanse |
friction caused by gas mouliculs in the air hitting an object and slowing it down. |
| steamline |
to design smooth ,rounded surfaces on an object so that it slips through the air with the least resistance. |
| motion |
a change in a position of an object. |
| speed |
the distance an object moves per unit time such as mph |
| inertia |
the tendency of an object to resist a change in moiton. |
