Question

# A wheel of radius $$R$$ and mass $$M$$ is placed at the bottom of a fixed step of height $$R$$ as shown in the figure. A constant force is continuously applied on the surface of the wheel so that it just climbs the step without slipping. Consider the torque $$\tau$$ about an axis normal to the plane of the paper passing through the point $$Q$$. Which of the following options is/are correct?

A
If the force is applied tangentially at point S then τ0 but the wheel never climbs the step
B
If the force is applied normal to the circumference at point P then τ is zero
C
If the force is applied normal to the circumference at point X then τ is constant
D
If the force is applied at point P tangentially then τ decreases continuously as the wheel climbs

Solution

## The correct options are A If the force is applied normal to the circumference at point P then $$\tau$$ is zero C If the force is applied normal to the circumference at point X then $$\tau$$ is constantA: Torque due to $$mg$$ decreases with angle whereas torque due to force is minimum at initial state. B: Applied force passes through point $$Q$$. So, its torque is zero.$$\because \vec{r}_{PQ} \times \vec{f} = 0$$. Hence $$\tau$$ is zeroC: Torque due to applied force at $$X$$ remains constant. The perpendicular distance to the line of the force remains constant. Hence torque remains constant.D: If the force is applied at the point $$P$$ tangentially then $$\tau$$ remains constant.Physics

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