Question

What if the perpendicular distance from the axis is infinity?

(a) The rotation is not possible

(b) The rotation is possible but the moment generated is very less

(c) The force applied will be very much high for even a small rotation

(d) No rotation unless the contact is being broken

I got this question in exam.

This intriguing question originated from Moment of a Force on a Specified Axis in chapter Force System Resultants of Engineering Mechanics

Answer 1

Right answer is (c) The force applied will be very much high for even a small rotation

The best I can explain: The long distance means a huge force which one needs to apply. Because distance increased will also increase the resistance inertia which will obviously increase the force required for the rotation. Though we know that the larger the distance the small is the force applied for rotation. But inertia must be taken into the considerations sometimes.