Question

Give two examples where friction is desirable and two examples where friction is not desirable.

Answer 1

ADVANTAGES of friction
1 it helps us to write on board or on paper
2 it helps in walking on the floor
DISADVANTAGES
1 it opposes the motion
2 forest fires are caused due to friction between leaves of the trees.

Answer 2

Answer:

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Explanation:

For example,

treading of shoes and tires is done to increase friction. When friction is undesirable we have to reduce the friction. Friction can be minimized by using lubricants like oil and grease and by using ball bearing between machine parts