Friction is a necessary evil: collect pictures from real life that can show friction is needed in many situations, whereas it has some bad effect in some other situations.
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Answer: Friction is the force which opposes the motion. Friction is the reason why we can walk or the vehicles could move or to write something on the board, hence it is advantageous. On the other hand, as a portion of energy gets wasted to overcome friction, it has some bad effects too.
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