Friction is some times undesirable
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Answer:
Without friction, you would not be able to walk, the wheels on a vehicle would have no grip on a road surfacing and the vehicle would not be able to move forward. On the other hand, friction is undesirable in most of the cases. Friction causes mechanical parts to seize and wear out.
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Answer:
Friction is a force that opposes motion between any surfaces that are touching. Friction can work for or against us. For example, putting sand on an icy sidewalk increases friction so you are less likely to slip. On the other hand, too much friction between moving parts in a car engine can cause the parts to wear out. Other examples of friction are illustrated in the two Figures below
Friction between the graphite in a pencil and a sheet of paper leaves a mark on the paper.
Explanation:
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