Why is it difficult to balance a stationary two-wheeler?
Stationary objects experience only the gravitational force. Such objects can be balanced only when the line of action — the line connecting the centre of gravity of the object towards the earth — touches the ground at a point within the base of the object.
If the base area is large, slight deviations due to external forces such as the wind will not push this point out of the base. So it is easy to balance such objects.
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