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