# CBSE Class 9 Science Motion Notes Set A

Download CBSE Class 9 Science Motion Notes Set A in PDF format. All Revision notes for Class 9 Science have been designed as per the latest syllabus and updated chapters given in your textbook for Science in Standard 9. Our teachers have designed these concept notes for the benefit of Grade 9 students. You should use these chapter wise notes for revision on daily basis. These study notes can also be used for learning each chapter and its important and difficult topics or revision just before your exams to help you get better scores in upcoming examinations, You can also use Printable notes for Class 9 Science for faster revision of difficult topics and get higher rank. After reading these notes also refer to MCQ questions for Class 9 Science given our website

MOTION
INTRODUCTION

Motion is a very preliminary state of action associated with living and non-living beings. The study of the displacement, velocity and acceleration associated with moving bodies can make us understand the motion of bodies. To have an in-depth study of motion, equational representation and graphical analysis of various related quantities in motion with time is also done.
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.
(i) An object is said to be a point object if it changes its position by distances which are much greater than its size.
(ii) 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.

Describing Motion :
When a tree, is observed by an observer A sitting on a bench, the tree is at rest. This is because position of the tree is not changing with respect to the observer A.
Now, When the same tree T is observed by an observer sitting in a superfast train moving with a velocity v, then the tree is moving with respect to the observer because the position of tree is changing with respect to the observer B.

Vectors : Physical quantities defined with both magnitude and direction are called vector quantities. They should also satisfy the law of vector addition.

Examples: Velocity, acceleration, force, displacement, momentum, weight, torque, electric field, magnetic filed, etc.

Scalars : Physical quantities having only magnitude are called scalar quantities.

Examples: Mass, time, distance, speed, work, power, energy, electric charge, area, volume, density, pressure, electric potential, temperature, etc.
TYPES OF MOTION

(A) According to Directions
(i) One dimensional motion is the motion of a particle moving along a straight line.
(ii) Two dimensional motion A particle moving along a curved path in a plane has 2-dimensional motion.
(iii) Three dimensional motion Particle moving in space has 3-dimensional motion.

(B) According to state of motion
A moving body may cover equal distances in equal intervals of time or different distances in equal intervals of time. On the basis of above assumption, the motion of a body can be classified as uniform motion and non-uniform motion.
Example of non-uniform motion –

(i) An aeroplane running on a runway before taking off.

(ii) A freely falling stone under the action of gravity.

(iii) An object thrown vertically upward.

(iv)When the brakes are applied to a moving car.

(C) According to path

(i) Linear motion : A body has linear motion if it moves in a straight line or path.

Ex.(a) Motion of a moving car on a straight road.
(b) Motion of a ball dropped from the roof of a building.

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