| A | B |
|---|
| motion | the change in position of an object |
| distance | the length of the actual path travelled |
| speed | the distance an object moves in a given amount of time |
| velocity | the speed of an object in a definite direction |
| acceleration | a change in velocity of an object in a period of time |
| Newton's First Law of Motion | an object at rest remains at rest until an unbalanced force acts on it |
| inertia | the tendency of an object to remain at rest or in motion |
| momentum | a measure of the strength of an object's motion: an objects mass multiplied by its velocity |
| Newton's Second Law of Motion | an unbalanced force on an object causes the object to accelerate in the direction of the force |
| Newton's Third Law of Motion | for every action there is an equal and opposite reaction |
| satellite | an object that moves in an orbit around another object |
| centripital acceletation | the acceleration of an object moving in a curved path at constant speed |
| centripital force | the force that causes an object moving at constant speed to move in a curved path |
| force | a push or pull that causes motion |
| balanced forces | forces equal in size acting in opposite directions |
| friction | a force that opposes motion |
