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Siddharth Gurla from BIRLA PUBLIC SCHOOL , asked a question
Subject: Science , asked on 19/9/12

Why is friction called a perverse force ?

EXPERT ANSWER

nitish.gupta ,Meritnation Expert added an answer
Answered on 20/9/12

Friction always opposes the relative motion between any two bodies in contact. Therefore, an extra energy has to be spent in overcoming friction.Thus it involves unnecessary expense of energy. That is the reason why friction is a perverse force.  

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Akanksha Chauhan , From Kendriya Vidyalaya No.2 , added an answer
Answered on 19/9/12

It always acts against the direction of movement.