Linear motion Rotational motion It is motion along a straight line It is rotation along a circle: a circular path or a circular orbit It has constant velocity or zero acceleration, Non Uniform Linear motion, with variable velocity or non-zero acceleration It can be uniform, that is, with constant angular rate of rotation The motion of a particle (a point-like object) along a line can be described by its position x, which varies with t (time). The rotation around a fixed axis of a three-dimensional body involves circular motion of its parts. It is a motion in a single dimension, distance traveled by an object is same as displacement. Rotational velocity is how fast the object is turning. Acceleration V= V0 + at ω = ω0 + at D = V0t + 1/2 at2 ω = ω0t + 1/2 at2