Question

Which of the following is not a method of increasing friction? i. It can be increased by making grooves in shoe soles. ii. It can be increased by making treads in tyres of vehicles. iii. It can be increased by making the surfaces smooth. iv. It can be increased by the use of some coarse substance on the hands of gymnasts​

Answer 1

Answer:

iii) It can be increased by making the surfaces is a method that decreases friction

Explanation:

i) The grooves are made in the soles of shoes to increase friction with the ground so that the shoes get a better grip even on slippery ground and we can walk safely.

ii) A series of patterns made into the surface of a tyre is called tread. It works the same as grooves in fact it is a type of grooves

iii) Friction on a surface is caused due to irregularities on that surface. A surface with more irregularities exhibits greater friction compared to a relatively smoother surface. By making surfaces smooth we just minimize or reduce the irregularities present on them which results in fewer chances in which other objects get locked with that, thus it results in reduced friction.

iv) Gymnasts apply the coarse substance on their hands to increase friction for a better grip. The coarse substance is chalk powder. The powder increases the friction between the bar and the gymnast's hands. It also absorbs sweat from the hands and keeps them dry for a better grip.

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