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5.Explain the terms rolling friction and sliding friction. How the use of ball bearings reduces friction.​

Answer 1

Answer:

Rolling friction is the frictional force that occurs when one object rolls on another, like a car's wheels on the ground. ... The coefficient of kinetic friction is typically denoted as μk, and is usually less than the coefficient of static friction. Sliding friction is when two solid surfaces slide against each other.

Ball bearing reduce friction because they roll rather than slide. Because the balls are rolling they have a much lower coefficient of friction than if two flat surfaces were sliding against each other.