Question

why friction a necessary evil? what will happen if the sole of the shoes does not have grooves?​

Answer 1

This is because muddy surface offers very less friction to the surface of the feet of a person. Soles of shoes have grooves on them. Grooved soles offer more friction to the ground which gives better grip while walking. Shoes with worn out soles can be slippery.

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Answer 2

Answer:

This is because muddy surface offers very less friction to the surface of the feet of a person. Soles of shoes have grooves on them. Grooved soles offer more friction to the ground which gives better grip while walking. Shoes with worn out soles can be slippery.

Explanation:

This is the necessary evil friction mark me as Brainliest