Dynamics- The study of bodies in motion(corollary of statics)
Particle- small, doesn't rotate
Rigid Body - not small, rotates
Dynamics is kinematics + kinetics
Kinematics - descriptive part of dynamics, uses geometry to describe
motion in terms of position, velocity, acceleration.
Kinetics- predictive part of dynamics, brings in Newton's Second Law
(NSL), to solve for acceleration, assuming given forces. Can then use
acceleration to determine motion.
Rectilinear motion (of a particle) is Motion along a given line
Where x=position coordinate. Choose origin and positive direction (+ is to
the right of O, - is P to the left