Linear speed is how much the object is moving forward:
It is expressed by the formula :
v = d / t (Linear velocity = change of distance over time)
mph, km/s , ft/s etc..
Angular speed is how much the object rotates in place:
It is expressed by the formula :
ω = θ / t (Angular velocity = change of angle/radian over time)
rpm, degree/second, radian/second etc..
The two connect via :
v = r * ω
Linear velocity = radius times angular velocity
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