Linear motion (also called rectilinear motion) is a one-dimensional 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;
non uniform linear motion with variable velocity or non-zero acceleration.
The motion of a particle (a point-like object) along a line can be described by its position x, which varies with t (time)
athlete running 100m along a straight track.
a train moving along a straight line
parade of soldiers
There are 5 five main climate types on Earth: