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the state in which one object's distance from another is changing

reference point

a place or object used for comparison to determine if an object is in motion

International System of Units

a system of measurement based on muliples of ten and on established measures of mass, length, and time


the basic SI unit of length


the distance an object travels per unit of time

average speed

the overall rate of speed at which an object moves; calculated by dividing the total distance an object travels by the total time

instantaneous speed

the speed of an object at one instant of time


speed in a given direction


the steepness of a line on a graph, equal to its vertical change divided by its horizontal change


one of the major pieces that make up Earth's upper layer

theory of plate tectonics

the theory that pieces of Earth's outer layer are in constant motion


the rate at which velocity changes

"Mary has chosen the good portion, which shall not be taken away from her."

Luke 10:42

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