Do you consider yourself fast or slow? Maybe sometimes you move quickly and other times more slowly. When you describe how fast something or someone is moving, in simple terms, you’re describing the speed of an object or person. Speed is a principle of physics, and it is measurable. Did you know you can calculate speed by measuring the distance traveled divided by time? When you are driving down the road, you see speed limit signs in miles or kilometers per hour. That tells us a distance traveled in a certain amount of time. For example, if the speed limit is 35 mph, after an hour traveling at that speed, how far would you have traveled? 35 miles!