This book has been conceptualized as per the recommended National Education Policy (NEP) 2020 and as per syllabus prescribed by University of Jammu for B. Sc. Students of Physics for the First Semester. It covers important topics such as Coordinate Systems, Inertial and Non-Inertial Frames, Mechanics of Centre of Mass and Collision of Particles, Motion Under a Central Force, Simple Harmonic Motion, Damped and Forced Harmonic Oscillator and Elasticity. It also contains the "First Step in Laboratory".