Question

Why is it easier to turn the steering wheel of a car if its diameter is large

Answer 1

for steering of wheel of small diameter the PERPENDICULAR DISTANCE between the POINT OF APPLICATION OF FORCE and the axis of rotation is less.T
Thus moment of force is less!!!!!!!

But for a steering wheel of large diameter the perpendicular distance is more and hence the turning effect is more.
Now for the same turning effect less force will be required in the bigger wheel.
Thus it easier to turn a steering wheel of large diameter than a steering wheel of small diameter.

Answer 2

Answer:

It is easier to turn the steering wheel of a large diameter than that of a small diameter because for turning a steering wheel, a force is applied tangentially on the rim of the wheel.

Explanation:

So, on increasing the diameter of the wheel i.e. the perpendicular distance of the line of action of the force from the axis of rotation, the moment of force increases. Hence, the steering wheel can be turned easily.

HOPE IT HELPS!