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12.What kind of friction comes into play:
(a) When a block of wood kept on table moves slowly.
(b) When a block of wood kept on table just tends to move (or slip)
(c) When a block of wood kept on cylindrical iron rods moves.
Pls give reason for it



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A) When the block moves horizontally, there is kinetic (dynamic) friction that comes into play.

b) When a block of wood kept on table just tends to move or slip,  from initial rest position, then static friction comes into play.  This friction is more than dynamic friction.

c) A block is kept on a set of cylindrical rods.  The rods rotate and so the block moves horizontally.  Then rolling friction comes into play.  This kind of friction is less than the other two types.
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