CBSE Class 9 Science Motion Exam Notes

CBSE Class 9 Science Motion Exam Notes. Please refer to the examination notes which you can use for preparing and revising for exams. These notes will help you to revise the concepts quickly and get good marks.


When a body does not change its position with time, we can say that the body is at rest, while if a body changes its position with time, it is said to be in motion.

*An object is said to be a point object if it changes its position by distances which are much greater than its size.

*A point or some stationary object with respect to which a body continuously changes its position in the state of motion is known as origin or reference point.


1.According to Directions

*One dimensional motion is the motion of a particle moving along a straight line.

*Two dimensional motion A particle moving along a curved path in a plane has 2-dimensional motion.

*Three dimensional motion Particle moving randomly in space has 3-dimensional motion.

2.According to state of motion

Uniform Motion

*A body is said to be in a state of uniform motion if it travels equal distances in equal intervals of time.

*If the time distance graph is a straight line the motion is said to be uniform motion.

Non-uniform motion

*A body has a non-uniform motion if it travels unequal distances in equal intervals of time. Ex. a freely falling body.

*Time - distance graph for a body with non-uniform motion is a curved line.

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