| A | B |
|---|
| motion | a change in position; movement |
| frame of reference | a still object that is needed to determine if motion is occuring |
| speed | distance traveled in a certain amount of time; s=d/t |
| velocity | speed in a given direction |
| acceleration | the change in speed; an increase in speed |
| deceleration | negative change in speed; slowing down |
| average speed | the total amount of distance traveled divided by the total amount of time it took |
| constant speed | same distance traveled every time interval; demonstrated by a straight line |
| slope | the steepness, or slant, of a line |
| projectile | any object that is thrown |
| projectile motion | the curved path (arc) an object makes as it is thrown in the air |
| free fall | the motion of a falling object when gravity is the only force acting on it |
| air resistance | the fluid friction experienced by objects as they fall through air |
| friction | the rubbing together of two surfaces; force that opposes motion |
| inertia | the tendency of an object to keep its motion |
| Newton's Laws of Motion | three laws developed by Isaac Newton that describe motion |
| Newton's 1st Law | an object in motion will stay in motion - an object at rest will stay at rest until an unbalanced force acts; inertia |
| Newton's 2nd Law | describes the relationship between force, mass, and acceleration |
| Newton's 3rd Law | for every action, there is an equal and opposite reaction |
| momentum | the product of an object's mass and its velocity |
| Law of Conservation of Momentum | the total amount of momentum before a collision is the same as the total amount of momentum after a collision |
