Abstract
The friction force on a circular object rolling without sliding down an inclined plane is due to static friction. If the object commences in a sliding mode at the top of the incline, and if the incline angle is small, then a small additional sliding friction force arises to reduce the sliding speed of the contact point to zero if the incline is sufficiently long. While the object is sliding, the total friction force is equal to the static friction force plus the sliding friction force. The effect is described theoretically and is supported by measurements of the linear and angular velocities of a ball that commences to slide down a smooth incline.
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