CBSE
Class 10
Class 12
Motion can be measured in different ways i.e.,
Speed: A speed of a body is defined as the distance travelled by a body per unit time.
Speed is a scalar quantity.
SI Unit of speed ms-1
Uniform Speed: When a body travels equal distances in equal intervals of time, the speed of the body is said to be uniform.
Non-uniform Speed: When a body travels unequal distances in equal intervals of time, the speed of the body is said to be non-uniform.
Average speed: For non-uniform motion, the average speed will describe one single value of speed throughout the motion of the body.
Velocity: Velocity of a body is the distance travelled by the body in unit time in a given direction.
Velocity is a vector quantity. Its value changes when either its magnitude or direction changes.
SI Unit of velocity ms-1
For non-uniform motion in a given line, average velocity will be calculated in the same way as done in average speed.
Average velocity: For uniformly changing velocity, the average velocity can be calculated as follows :
Here u = initial velocity
v = final velocity