Definition: The rate at which something moves or travels; the rate at which something happens or is done.

Explanations/notes: Calculating speed is related to the distance traveled and the time needed to travel the distance as follows(S=D/T); Rate is the change over time and if you think distance as a change in position then speed is the rate at which distance is traveled or the rate of change in position; Average speed describes speed of motion when speed is changing, it is the total distance traveled divided by the total time of travel and can be calculated using the relationship among speed, distance, and time. Changing speed, much of the time the speeds you experience are not constant and instantaneous speed is the speed at a given point in time. Formula(s): Speed=Distance/Time Unit(s): m/s; km/h; and cm/s

Everyday ex.: If a moving car traveled a distance of 25m. And it took 5sec. to travel that distance. Then the car was moving at a speed of 5m/s.

Sample Problem: Fred was riding his scooter from his house to the market. He traveled a distance of 6km. in a time of 2hours. What was his average speed?

This 9mm bullet traveled a distance of D. In the time of T. So its speed is S=D/T

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This 9mm bullet traveled a distance of D. In the time of T. So its speed is S=D/T