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  9. Q10

RRB Junior Engineer / DMS / CMA 2019 · Question 10 of 3719

What does friction cause to the screws, ball bearings and soles of the shoes?

Physics - Mechanics

  1. Aa. Friction has no effect on these
  2. Bb. Friction protects all these
  3. Cc. Friction avoids all the damages that could be caused these due to other forces.
  4. Dd. Friction wears out these materials and damages themCorrect

Answer: D. d. Friction wears out these materials and damages them

Explanation

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.

Source: RRB JE 2019 CBT-1 (24-May-2019 Shift-2) — ixambee compilation with answer key and solutions · reliable-secondary

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