This article brings you the CBSE Class 9 Science notes on chapter 8 ‘Motion’ (Part-I) . These chapter notes are prepared by the subject experts and cover every important topic from the chapter. At the ...

Velocity-time graphs are used to describe the motion of objects which are moving in a straight line. The object may change direction, eg from forward to backwards, up or down, left or right.

The speed of an object does not require a direction to be considered, it simply has a value and unit, for example, 27 \(m\,s^{-1}\). Velocity is a vector quantity which requires a value, unit and ...