![]() Then ask them if they have heard the word velocity used. Before students read the section, ask them to give examples of ways they have heard the word speed used. ![]() The data tables below depict objects with constant and changing speed.In this section, students will apply what they have learned about distance and displacement to the concepts of speed and velocity. An object with a changing speed would be moving a different distance each second. This would be in stark contrast to an object that is changing its speed. If we could measure her position (distance from an arbitrary starting point) each second, then we would note that the position would be changing by 6 meters each second. The runner would cover a distance of 6 meters every second. If her speed is constant, then the distance traveled every second is the same. For instance, a cross-country runner might be running with a constant speed of 6 m/s in a straight line for several minutes. That is, the object will cover the same distance every regular interval of time. ![]() Occasionally, an object will move at a steady rate with a constant speed. Moving objects don't always travel with erratic and changing speeds. Since the task of averaging speedometer readings would be quite complicated (and maybe even dangerous), the average speed is more commonly calculated as the distance/time ratio. You might think of the instantaneous speed as the speed that the speedometer reads at any given instant in time and the average speed as the average of all the speedometer readings during the course of the trip.
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