Question

what are the two thrust of physics?

Answer 1

The principal of thrusts in physics are unification and reduction.
in unification, Diverse phenomena of nature are expressed in few terms of laws and concepts. for example,the law of gravitation. It explains falling of objects on earth,planetary motion, motion of moon, etc.
Only one law explains so much phenomena! it becomes convenient for us to study only one law and understand too many phenomena
2. reduction, in this we derive simpler equations form the complex systems from its constituent simpler parts. for example, BOHR radius, it is a very complex formula, but now we use only the simpler version of it, I.e. r1×n/Z
where n is the no. of shell, Z is the atomic number and r1 is the constant, radius of 1st shel l of hydrogen.

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Answer 2

Answer:

Two main thrusts in Physics are :

(i) Unification is explaining diverse physical phenomena in terms of a few concepts and laws, e.g., same l aw of gravitation given by Newton explains planetary motion, motion of moons around a planet and a body  falling to the ground.

(ii) Reduction is deriving the properties of bigger, more complex system from the properties and interaction  of its constituent simpler parts, e.g., in thermodynamics, the temperature is related to the average kinetic  energy of molecules of the system.