Unit 2- Force and Motion Vocabulary- Part I

A system of objects that are not moving with respect to each other Frame of Reference A system of objects that are not moving with respect to each other

Movement in relation to a frame of reference Relative Motion Movement in relation to a frame of reference

Length between two points Distance Length between two points

Displacement The position with respect to the origin; the length and direction from the starting point to the ending point.

Ratio of the distance traveled to the time the object moves Speed Ratio of the distance traveled to the time the object moves

The total distance traveled divided by the total time traveled Average Speed The total distance traveled divided by the total time traveled

The rate at which an object is moving at a given moment in time. Instantaneous Speed The rate at which an object is moving at a given moment in time.

A description of motion involving both speed and direction. Velocity A description of motion involving both speed and direction.

Acceleration The change in velocity. It can occur when speed changes, when direction changes or when both speed and direction changes.

The movement of an object toward Earth because of gravity. Free Fall The movement of an object toward Earth because of gravity.

Constant Acceleration A steady change in velocity