Question

Which of the following action increases friction
(a) Treading of tyres
(b) Replacing moving parts with ball bearings in machines
(c) Applying powder on carom board
(d) Applying oil on joints of machine​

Answer 1

Answer:

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Explanation:

d is not the answer becoz it helps the machine to reduce friction and work better

c is not the answer becoz it helps the coins to move faster by reducing friction.

b is not the answer becoz it reduces friction and helps the machines from not rubbing each other

So the answer is the first option becoz treads in tyres give friction to cars for applying quick brakes etc.

Answer 2

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