Question

friction is a wasteful at time so why we need to increase it in some cases ?
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Answer 1

friction is necessary in our day to day life

Explanation:

without friction nothing could be possible such as we could not write anything nor we could walk on road, vehicle cannot move, amd many more things. so for this reason we need to increase friction some times.

friction is also referred as necessary evil.

Answer 2

Answer:

Though friction is said to be a waste of energy in most of the times, it is really useful at many times in regular life. ... The friction on the soles of our shoes need to be increased to have better grip on the ground while walking, which helps us to keep balance.