What is useful and harmful about friction? What are the answers?


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Gloria Lcy answered

Useful - friction gives us a hold on things. This allows us to hold objects, walk, drive... Accidents can be prevented because of friction. This stops or slows down the motion of the car.

Harmful - a boy running on the road suddenly fell. He got a scrape on his knee because the friction between his knee and the road broke his skin. Other than that, friction is a force which can cause the requirement of force to move a car to increase. This is because the force needed to cause a forward motion in a car must be more than the frictional force between the tyres and the road.

I hope it was useful.

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