Question

Here the threading in the tyres and the grooves in the sole of a shoe are used to
increase the friction.​

Answer 1

Appropriate question :-

How to increase friction tyres are threaded and the sole of your shoe is grooved?

AnswEr :-

Friction can be increased by making the surfaces rough.

Have you ever thought why the sole of your shoe is grooved?

The soles of shoes are grooved to provide better grip on the floor or roads to move safely because

grooving increases friction between the floor and shoes.

Why the tyres of vehicles are treaded ?

The tyres of cars and other vehicles are treaded to run without skidding by increasing the friction between tyres and the road.

The worn out tyres are discarded because their tread are worn off and limiting their effectiveness of providing required amount of friction$.$