M

Mr. Dubey • 52.33K Points
Coach 

Q. Friction can be increased by

(A) using air cushion
(B) lubricants
(C) using sand
(D) using ball bearings

Explanation: 
 by throwing sand the force of friction between the wheels and the track becomes easier. on rainy days, we throw sand on the slippery ground. this increases the friction between our feet and the ground and reduces the chance of slipping.

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