Laws of MotionHard

Question

A block is first placed on its long side and then on its short side on the same inclined plane (see figure ) . The block slide down in situation II but remains at rest in situation I. A possible explanation is
Situation - ISituation = II 

Options

A.The normal contact force is less in situation -II
B.The frictional force is less in situation -II because the contact area is less.
C.The shorter side is smoother
D.In situation -I, frictional force is more.

Solution

The is due to less frictional force or low friction coefficient.

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