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This book covers Physics (Honours) syllabi of Indian universities on Units and Dimensions, Vector and Cartesian Tensors, Dynamics of a Particle, System of Particles and Rigid Bodies, Inertial and Non- Inertial Frames of Reference, Lagrange’s and Hamilton’s Formulation of Mechanics, Small Oscillations, Gravitation, Gravity and Pendulum, Elasticity, Viscosity, Mechanics of Ideal Fluid, Surface Tension and Brownian Motion (15 Chapters).The variational principle has been used to write Lagrange’s equation in mechanics (non-inertial frames) with constraints (isoperimetric problems, Lagrange’s undetermined multipliers and their significance), in e.m. field (Lorentz force law), optics (Fermat’s principle), electricity (l-C-R circuit), acoustics etc. These actually exhibit a structural analogy in different branches of physics; (discussed with solved examples).The re-defined SI units (w.e.f. 20 May 2019) are also included.Salient Features:• The subject matter has been developed thoroughly starting from the basics retaining the level of precision and coherence throughout the entire text.• The physical content of a law has been discussed critically from different angles with special emphasis on its limitation and applicability in a particular physical problem. This will develop thorough understanding of physical laws, particularly in classical mechanics.• Emphasis has been laid on the points where there is a scope of misunderstanding and those have been clarified with examples.• More than 240 fully worked-out problems of physical interest are given at appropriate sections using the relevant concepts (after justification). These will help in developing problem-solving ability among students.• More than 225 unsolved physical problems are included in the exercise (with hints for difficult ones).• 450 line diagrams for proper understanding.