The magnitude of the net torque on the wheel due to these three forces for an axis perpendicular to the wheel and passing through its center is
¹/₂MR³a.
Net torque on the wheel
The net torque on the wheel is determined from the moment of inertia of the pulley and the angular acceleration of the pulley.
∑τ = Iα
where;
Let the pulley be a solid uniform disk, the moment of inertia of the axis perpendicular to the wheel and passing through its center is calculated as;
I = ¹/₂MR²
τ = ¹/₂MR²α
τ = ¹/₂MR²(aR)
τ = ¹/₂MR³a
where;
Thus, the magnitude of the net torque on the wheel due to these three forces for an axis perpendicular to the wheel and passing through its center is ¹/₂MR³a.
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