If a wheel always stops in the same position when it is free to turn about its axis, it suggests that the wheel is in a state of stable equilibrium. This indicates that the wheel's center of mass is directly above its point of contact with the surface it rests on, creating a balanced system. The wheel's moment of inertia may also play a role in determining its behavior when free to turn about its axis.
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its centre of gravity is not centred. or it has a gear mechanism which controls its movement