Stationary objects experience only gravitational force.
Such objects can be balanced only when -----
The line connecting the center of gravity of the object towards the earth
Touches the ground at a point within the base of the object.
If the base are is large, like in the case of a 4 wheeler,
Slight deviations due to external forces such as wind, will not push this point out of the base.
So, it is easy to balance such vehicles.
In the case of two wheelers, the base is very narrow.
Hence any slight disturbances, will push the line of action outside the base area.
Leading to vehicle becoming imbalanced.
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