Imagine a car driving forward at constant speed. If the car would make a turn, each wheel would get its own speed since each wheel has its own radius to the center of the curve. But does the center of car's speed stay the same? Here's a simulation I made: https://vid.me/HYz9 [Broken] The red arrow represents the center of the car's velocity, the green arrow is the front wheel's velocity. As I turn the wheel, the front wheel's speed get's bigger, but the center of the car's speed stays the same. Is this accurate? The way I see it is that if a car drives straight at speed V, it then makes a turn, after the turn it straightens out and the speed will still be V. Obviously this only works if there is no forces that slows down the speed, which is assumed here.