| A | B |
|---|
| force | a push or pull eexerted on an object |
| Newton | unit of measure that equals the force required to accelerate 1 kilogram of mass at a meter per second |
| Net Force | overall force on an object when all the individual force acting on it are added together |
| Unbalanced Force | forces that produce a nonzero net force which changes an objects motion |
| balanced force | equal force acting on an object in the opposite direction |
| friction | force that one surface exerts on another when the two surfaces rub against eachother |
| Static Friction | friction that acts on an object that are not moving |
| sliding friction | friction that occurs when one solid surface slides over another |
| rolling friction | friction that occurs when an object rolls over a surface |
| fluid friction | friction that occurs at the surface of a liquid |
| gravity | force that pulls objects toward eachother |
| mass | amount of matter in an object |
| weight | force of gravity on an object at the surface of a planet |
| free fall | the motion of a falling object when the only force acting on it is gravity |
| air resistance | fluid friction experienced by objects falling through the air |
| terminal velocity | greatest velocity a falling object can achieve |
| projectile | object that is thrown |
| Newton's first law | An object at rest will remain at rest unless acted upon by an outside force |
| Inertia | tendency of an object to resist any change in motion |
| Newton's Second Law | acceleration depends on the objects mass and on the net force acting on an object |
| Newton's Third Law | exerts a force on another object |
