What are the two approaches to be applied while studying physics ? Give suitable example for each.

Explanation

Unification and Reductionism are the two approaches in studying physics.
(i) Attempting to explain diverse physical phenomena with a few concepts and laws is unification. For example, Newton’s universal law of gravitation explains the motion of freely falling bodies towards the Earth.
(ii) An attempt to explain a macroscopic system in terms of its microscopic constituents. For example, thermodynamics was developed to explain macroscopic properties like temperature, entropy, etc., of bulk systems. These are interpreted in terms of molecules by kinetic theory of gases.