Medium
Which one is not a process to increase friction?
Explanation
Explanation
Grooved shoe soles, brake pads, and rubbing hands with soil are all techniques used to increase grip, i.e., increase friction. Sprinkling fine powder on a carom board, however, makes the surface smoother so the striker and coins slide more easily — this actually reduces friction, not increases it. So the correct answer is option (3).
PRO TIP
Re-check your working by substituting the answer back into the original question.