Why does a bicycle wheel precess when suspended from a string?

AI Thread Summary
The discussion centers on the precession of a bicycle wheel suspended by a string, focusing on the forces acting on the system. Two main forces are identified: the downward force of gravity at the wheel's center of mass and the upward tension in the string. The confusion arises regarding how the axle remains horizontal despite the different lines of action of these forces. It is clarified that while the lines of action influence net torque, they do not affect the net force, allowing the axle to maintain its horizontal position. This understanding resolves the initial query about the mechanics of the system.
Amith2006
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Almost everything is clear to me as far as the reason for the precession of a bicycle wheel suspended by a string from a rigid support is concerned. But I don't understand one thing about it. There are 2 forces acting on the system- one is the downward force of gravity at the center of mass of the wheel and the other is the tension in the string acting in the upward direction. It is said that the axle of the wheel manages to remain horizontal as the 2 forces get cancelled. How is it possible when the lines of action of the 2 forces are different?
 
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The lines of action affect the net torque, but not the net force.
 
You are right! Thanx.
 
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