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Dynamics is the branch of science which deals with the study of a particle (or of a body), when the particle (or body) is in motion. The dynamics is further divided into kinematics and kinetics. The study of body in motion, when forces which cause motion are not considered, is called kinematics whereas if the forces are considered for the body in motion, that branch of science is called kinetics. This chapter deals with velocity, acceleration, their relationship, relative motion, curvilinear motion, Newton’s laws, work energy equation of particles, impulse and momentum and