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This resultant frictional force is still rearward acting (tending to contribute to the angular velocity), but the new distribution of the normal forces creates a net torque negating the rotational contribution of the friction and causing an overall deceleration of the wheel?s forward velocity. Also, the major source of energy losses during rolling motion is primarily due to the deformation that occurs when the two surfaces are compressed and relaxed. This continual process generates heat in both the wheel and the surface.
http://www.school-for-champions.com/science/frictionrolling.htm
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