| A | B |
|---|
| Frame of reference | A system of objects that are not moving with respect to one another |
| Relative motion | A movement in relation to a frame of reference |
| Distance | The length of the path between two points |
| Vector | A quality that has magniture and direction |
| Resultant Vector | The vector sum of two or more vectors |
| Speed | The ratio of the distance an object moves to the amount of time the moves take |
| Average Speed | The total distance traveled divided by time |
| Instantaneous Speed | The rate at which an object is moving at a given moment in time |
| Velocity | The speed and direction in which an object is moved |
| Acceleration | The rate at which velocity changes |
| Free Fall | The movement of an object toward earth |
| Constant Acceleration | A steady change in velocity |
| Linear Graph | The display data form straight-line parts |
| Nonlinear Graph | A curve connects the data points that are plotted |
| force | a push or pull that occurs on an object |
| Newton | the SI unit for force equal to the force that causes a one kilogram mass to accelerate at a rate of i meter per second squared |
| net force | the overall force acting on an object after all forces are combined |
| friction | a force that opposes the motion of objects that touch as they move past each other |
| air resistance | fluid friction acting on an object acting on an object moving through the air |
| gravity | the attraction between any two objects because of their air masses |
| terminal velocity | the consistent velocity of a falling object when the force of air resistance equals the force of gravity |
| projectile motion | the curved path of an object in free fall after itn is given an initial forward velocity |
| inertia | the tendency of an object to resist a charge and its motion |
| mass | the amount of matter in an object |
| weight | the force of gravity acting on an object |
| momentum | the production of an object's mass and its velocity |
| law of conservation of momentum | the law stating that the total momentum of a system does not change if no net force acts on a system |
