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      Question

      What does friction cause to the screws, ball bearings

      and soles of the shoes?
      A Friction has no effect on these Correct Answer Incorrect Answer
      B Friction protects all these Correct Answer Incorrect Answer
      C Friction avoids all the damages that could be caused these due to other forces. Correct Answer Incorrect Answer
      D Friction wears out these materials and damages them Correct Answer Incorrect Answer

      Solution

      Friction is a force that opposes the motion and comes into play when two bodies in contact either try to move or start moving over each other. When two bodies rub against each other, Frictional force comes into play, and work is done to overcome the friction. As a result, heat is produced, and when the objects are repeatedly subjected to this heat in the long run and get damaged. The nano-scale irregularities present on the surfaces of contact are considered as the origin friction. Lubrication and Smoothening of surfaces are done to reduce friction.

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