MOTION Motion: Change in position over time and is described by speed, velocity and acceleration.

SPEED: Measures the distance an object travels in a given period of time. MOTION Speed is a scalar quantity.

A scalar quantity: has magnitude only. Typical examples of scalar quantities are time, speed, temperature, and volume. A scalar quantity or parameter has no directional component, only magnitude. For example, the units for time (minutes, days, hours, etc.) represent an amount of time only and tell nothing of direction. MOTION

A vector: has both magnitude and direction. Magnitude, or "size" of a vector, is also referred to as the vector's "displacement." It can be thought of as the scalar portion of the vector and is represented by the length of the vector. MOTION

DISPLACEMENT: The difference between the initial position of an object and any later position. MOTION

Key Context Displacement, unlike distance, is concerned only with the difference between an object's starting and ending points. The displacement is a vector. You can find the displacement by subtracting the initial position from the final position. MOTION

DISTANCE: the amount of space between one point and another Key Context Distance describes the location of one point in relation to another. The space between two points can be measured linearly in standard units, such as inches, feet, and miles, or in metric units, such as centimeters, meters, and kilometers. MOTION

VELOCITY: a vector quantity that indicates both the rate at which displacement changes and the direction of motion Key Context Velocity is a vector formed by computing the displacement per unit time. It indicates both how fast an object is moving and in which direction. MOTION

 FRAME OF REFERENCE: Provides a system of coordinates for identifying an object’s location MOTION

 ACCELERATION: Takes place with any change in velocity MOTION