Kinematics of Motion:
Kinematics deals with the geometry of motion and concepts like displacement, velocity, and acceleration considered functions of time.
Plane Motion:
When the motion of a body is confined to only one plane, the motion is said to be plane motion. The plane motion may be either rectilinear or curvilinear.
Rectilinear Motion:
It is the simplest type of motion and is along s straight line path. Such a motion is also known as Translatory Motion.
Curvilinear Motion:
It is the motion along a curved path. Such a motion, when confined to one plane is called plane curvilinear motion.
When all the particles of a body travel in concentric circular paths of constant radii such as a pulley rotating about a fixed shaft rotating about its own axis, then the motion is said to be a plane rotational motion.