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I undertand that, for any one given point on a wheel, mounted on a vehicle,
traveling horizontally, more or less, there is a forward velocity (not constant) for exactly one half the time, and a rearward velocity (not constant) for exactly half the time, in relation the wheels' point of rotation. The average of this constantly changing velocity just happens to be the same as the forward speed of the vehicle. There is no forward velocity - there *is* a change in angular momentum though. Do you not understand that concept? -- Duncan |
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