Velocity is similar to speed in that they both deal with how fast something is moving; however, velocity also deals with the direction in which the thing is moving. Therefore, an object can be changing its velocity, but not its speed. For example, when my dog, pictured here, runs at a constant pace around my yard, his speed will not change. However, because my dog has to turn around and run in giant circles to avoid hitting my gates and walls, he changes his direction and therefore changes his velocity as well. In essence, direction is the only difference between speed and velocity.
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