the motion of a point such that its speed ν is constant. The distance traversed in the time t by a point in uniform motion is s = vt. When a rigid body undergoes uniform translational motion, the above definitions apply to each point of the body. A body may also undergo uniform rotation about a fixed axis; in this case, the body’s angular speed ω is constant, and the angular displacement of the body is ϕ = ωt.