Sliding Friction on a Wheel: How Does Static Friction Prevent Motion?

AI Thread Summary
Static friction opposes the motion of a wheel at the point of contact with the ground, acting only when the wheel is about to move. If a wheel has both linear and angular velocity, kinetic friction would typically apply; however, if the wheel is turning without slipping, static friction is relevant. The relationship between linear and angular velocity determines whether the wheel is sliding or rolling without slipping. When there is no slippage, the point of contact remains motionless, justifying the use of the static friction coefficient. Understanding these dynamics is crucial for analyzing the forces at play in wheel motion.
DZABHINAV
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How is a sliding wheel is opposed by static friction?
Static friction acts only when the body is about to move.
My point is
if the wheel is has a linear velocity and angular velocity than kinetic friction should act on the body rather than static friction.
 
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DZABHINAV said:
How is a sliding wheel is opposed by static friction?
Static friction acts only when the body is about to move.
My point is
if the wheel is has a linear velocity and angular velocity than kinetic friction should act on the body rather than static friction.

Look at the point where the wheel contacts the ground. Is the wheel turning without slipping? That is, is the linear velocity just related to the angular velocity and the radius? Or is the wheel sliding on the ground as well as rotating? If there is no slippage, you would use the static friction coefficient.
 
that means cause the point of contact is motionless, we call it static friction.
thanks a lot.
 

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