| A | B |
|---|
| motion | a change in position of an abject when compared to a reference point |
| speed | how fast an object moves from one place to another in a specific amount of time |
| average speed | the total distance traveled divided by the total time |
| velocity | the speed and direction of a moving object |
| acceleration | a change in the velocity (speed or direction of a moving object |
| force | any push or pull that causes an object to move or to change its speed or direction of motion |
| friction | a force that opposes motion |
| inertia | the resistance of objects to change their motion |
| gravitational force | the force that tends to pull objects toward the center of the earth |
| mass | the amount of matter in an object |
| weight | the measurement of the gravitational force acting on an object |
| Newton's First Law | an object remains at rest or moves at a constant speed in a straight line unless acted on by an outside force |
| Newton's Second Law | the acceleration of an object is determined by its mass and the size and direction of the force acting on it |
| Newton's Third Law | for every force (action) there is an equal and opposite force (reaction) |
| momentum | an object's mass multiplied by its velocity |
| newton | the force needed to cause 1 kg of mass to accelerate 1 meter per second each second |
| air resistance | the friction between a solid object and air |
| projectile | any object shot or thrown through the air |
| centripetal acceleration | acceleration toward the center of a circle by an object moving in a circular path |
| centripetal force | the force that causes an object moving in a cirular path to move to the center of a circle |
| terminal velocity | greatest velocity reached by a falling object |
