Can anyone explian angular displacement?
[Additional Details] It seems your question has three parts: i) “why are θ,omega,alpha vector quantities, and what is the meaning of them having a direction?” ii) “with particular reference to (uniform) circular motion” iii) “ditto the meaning of s,v having a vector direction” i) The answer is that their vector direction is the axis of rotation, which will be perpendicular to the plane of the rotation (for planar rotation anyway). Think of them as a scalar attached to a direction. It’s a convention. ii) [5 days ago: my question is how can θ be vector quantity since it does not travel in a particular direction secondly v from which omega is derived is only when a body has one direction but here the particle rotates] When talking about (uniform) circular motion, |v|=omega²/r At any instantaneous moment, linear velocity v is tangential to the circle. Thus the only direction to which v is always tangent is n, the axis of rotation, which is perpendicular to the entire plane of rotation. In
