| A | B |
|---|
| acceleration | rate of change of velocity; can be calculated by dividing the change in the velocity by the time it takes the change to occur. |
| air resistance | force that opposes the motion of objects that move through the air. |
| average speed | total distance an object travels divided by the total time it takes to travel that distance. |
| balanced forces | forces on a object that combine to give a zero net force and do not change the motion of the object. |
| displacement | distance and direction of an object's change in position from the starting point. |
| distance | how far an object moves. |
| force | a push or pull exerted on an object. |
| friction | a force that opposes the sliding motion between objects that are in contact. |
| instantaneous speed | speed of an object at a given point in time; is constant for an objectmoving with constant speed, and changes with time for an object that is slowing down or speeding up. |
| net force | sum of the forces that are acting on an object. |
| sliding friction | frictional force that opposes the motion of two surfaces sliding past each other. |
| speed | distance an object travels per unit of time. |
| static friction | frictional force that prevents two surfaces from sliding past each other. |
| unbalanced forces | forces that combine to produce a net force that is not equal to zero and cause the velocity of an object to change. |
| velocity | the speed and direction of a moving object. |
