Chapter 1.1: Rectilinear motion & Rotational motion (Mechanics)

Rectilinear motion: Linear motion (also called rectilinear motion) is a motion along a straight line, and can therefore be described mathematically using only one spatial dimension. The linear motion can be of two types: uniform linear motion with constant velocity or zero acceleration and non-uniform linear motion with variable velocity or non-zero acceleration. This type of motion describes the movement of a particle or a body. A body is said to experience rectilinear motion if any two particles of the body travel the same distance along two parallel straight lines. The figures below illustrate rectilinear motion for a particle and body. Fig. 1 shows (a) Rectilinear motion of a particle; (b) Rectilinear motion of a body.