| A | B |
|---|
| motion | a change in position of an object when compared to a reference point |
| speed | how far 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 movement of one surface past another |
| inertia | the tendency of objects to resist change in their motion; causes objects to stay at rest or stay in motion |
| gravity | the force that tends to pull objects towards the center of the earth or towards each other |
| mass | the amount of matter in an object |
| weight | a measurement of the gravitational force acting on an object |
| First Law of Motion | every object remains at rest or moves at a constant speed in a straight line unless acted upon by some outside force. |
| Second Law of Motion | the acceleration of an object is determined by the size of the force acting and the direction in which it acts |
| Third Law of Motion | for every force there is an equal and opposite force |
| kilometers per hour | the number of kilometers an object can travel in one hour |
| newton | a measure of force |
| drag | friction between a solid surface and a liquid or gas is sometimes called this |
| air resistance | friction caused by gas molecules in the air hitting an object and slowing it down |
| cause | a person, thing, or event that makes something happen |
| effect | whtever is produced by a cause; a result |
