In which of the following does friction play a helpful role? (i) Striking a match stick (ii) Playing snooker (iii) Writing on the blackboard

Pressure at a given depth inside a stationary liquid is different at all points on the horizontal plane.

In which of the following does friction play a helpful role? (i) Strik

1.	In which of the following does friction play a helpful role? (i) Striking a match stick (ii) Playing snooker (iii) Writing on the blackboard
A.	Only (i) and (ii)
B.	Only (ii) and (iii)
C.	Pressure at a given depth inside a stationary liquid is different at all points on the horizontal plane.
D.	(i), (ii) and (iii)
Answer» E.

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In which of the following does friction play a helpful role? (i) Striking a match stick (ii) Playing snooker (iii) Writing on the blackboard

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