| A | B |
|---|
| acceleration | change in velocity; (final velocity - initial velocity)/change in time |
| newton's second law | Force = mass x acceleration |
| weight | the force of gravity on an object at the surface of a planet; mass x gravitational pull |
| unbalanced force | a nonzero net force, which changes an object’s motion |
| force | a push or pull exerted on an object |
| velocity | distance/time + direction |
| newton | metric unit of force; equals the force required to accelerate 1kg at 1m/s2 |
| newton's first law | an object at rest stays at rest, an object in motion stays in motion in a straight line at a constant speed unless acted upon by an outside force |
| friction | the force that one surface exerts on another when the two rub against each other |
| inertia | the tendency of an object to resist any change in its motion |
| balanced forces | equal forces acting on an object in opposite directions |
| speed | distance/time |
| gravity | the force that pulls objects toward each other |
| newton's third law | for every action there’s an equal and opposite reaction |
