Angular Velocity
A car moving at a velocity v to the right has a tire rotating with an angular velocity ω. The speed of the tread of the tire relative to the axle is v, the same as if the car were jacked up. Thus the car moves forward at linear velocity v=rω, where r is the tire radius. A larger angular velocity for the tire means a greater velocity for the car.
Source
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"OpenStax College, College Physics. November 10, 2012."
http://cnx.org/content/m42083/latest/?collection=col11406/1.7
OpenStax CNX
CC BY 3.0.