(i) Above information tells us about ………..  A) Pressure  B) Friction 

Irregularities on the surfaces lock into one another when we attempt to move on any surface. We have to apply a force to over come interlocking. On rough surfaces in which a large number of irregularities exist. So the force of friction is greater if a rough surface is involved.

(i) Above information tells us about ……….. 

A) Pressure 

B) Friction 

C) Time

D) Mass

(ii) What would you generalise from the above information? 

A) Friction decreases with increasing roughness 

B) Friction is independent of Roughness 

C) All surfaces have same friction

D) Friction increases with increasing roughness