Kinematics ⇒ A subset of kinematics that is particular to motion in a straight line is called linear kinematics.

Distance ⇒ Distance refer to a physical length. When body moves from one location to another, the length of the path that the body follow is the distance, e.g. when a runner completes 2 laps around a 400 m track, the distance that the runner has covered is equal to (400 + 400) 800 m.

Displacement ⇒ It is change in position displacement is the shortest distance from the initial position to the final position of a point. It is measured in a straight line e.g. in the completion of a lap around the 400 m track, the displacement is zero because the starting and finishing positions are the same.

Speed ⇒ Speed is the rate at which an object covers distance. It is defined as the distance covered, divided by the time taken to cover it.

\(\bar s=\frac{1}{\triangle t}\)

l = length of path

t = time

Δ = delta (or) change in time

\(\bar s\) = average speed

Velocity ⇒ Velocity is the change in position or the displacement that occurs during a given period of time.

\(v=\frac{d}{\triangle t}\)

v = velocity

d = displacement

t = time

Δ = delta (or) change in time

Acceleration ⇒ The rate of change of velocity is called acceleration.

May be positive may be negative.

a = v/t or a d/t² = m/sec² unit

Positive acceleration : the final velocity (v₂) will be greater than initial velocity (v₁) [deacceleration]

Unit are meters/second²