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Be honest, how many of you said 159 miles per hour? The reason for this dramatic difference lies in the subtle distinction between speed and velocity.The best way to start examining the difference between speed and velocity is to look at your car's speedometer.The next time you're in your car on the highway, do just that. I'm going to assume you always obey the speed limit, so if the speed limit is 65 miles per hour, your speedometer should read 65 miles per hour.This means that if you drive for 65 miles, it will take you an hour.In this case, the store is north and east of your house, so you moved at an average velocity of 27.1 meters every hour in a northeasterly direction.The velocity does not care that you walked east first, then south, then east again, and so on, only that you ended up northeast of where you started.
The exact route doesn't matter here - only the direct distance from start to finish.Displacement always has both a magnitude and a direction.Let's look at the equation for average velocity: Average velocity = displacement / time In this equation, velocity is represented by a letter v with a bar over it. The change in displacement is delta s, and the change in time is delta t. We calculated Jimmie Johnson's average speed, but what about his average velocity? The point on the track where the car is serves as both the starting line and the finish line.To put an official definition on it, speed is how much distance is covered over a specific period of time, regardless of direction traveled.Since there is no directional component, speed must be a scalar quantity.
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