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CBSE Notes for Class 9 Science chapter 8. Motion: Distance and Displacement, quick revision notes for Class 9 Science chapter 8. Motion Distance and Displacement, Chapter-wise CBSE Revision Notes, CBSE Notes PDF Free Download, CBSE One Liner Notes Class 9, Half Yearly Revision Notes, CBSE Revision Notes Class 9 Science
Get CBSE Notes for Class 9 Science Chapter 8. Motion: Distance and Displacement prepared by experts as per the latest NCERT syllabus and CBSE exam pattern. These concise and easy-to-understand notes cover important definitions, formulas, diagrams, and key concepts from the chapter to help students in quick revision and effective exam preparation. Whether you are studying for school tests, board exams, or competitive exams, these notes provide a reliable study resource. Designed in simple language with point-wise explanations, they save time and enhance learning efficiency. Download free PDF notes, explore solved examples, and strengthen your understanding of [Topic Name] for scoring high marks. Perfect for Class 9 students who want clear, structured, and exam-oriented notes for CBSE Science.
(Science - IX)
Motion: when an object changes its position respect to its surrounding with time, it is said to be the object is in motion.
Example: motion of flying birds, motion of car, motion of blood in arteriesand veins etc.
Most motions are complex. Some objects may move in a straight line, others may take a circular path. Some may rotate and a few others may vibrate. There may be situations involving a combination of these.
Origin: we need to specify a reference point that describes the position of an object is called the origin.
Distance: This is total path covered by the body between its initial and final position is called distance.
Displacement: The shortest distance measured from the initial to the final position of an object is known as the displacement.
Magnitude: The numerical value of a physical quantity is its magnitude.
Physical Quantities: Quantities in physics which can be measured are called physical quantities like mass, time, area, velocity, area, density, volume, force etc.
scalars and vectors quantities:
Scalars quantities: The quantities that require magnitudes only to specify them are called scalars quantities or scalars. e.g Mass, time, area, speed, distance, temperature, density, volume etc.
Vector quantities: Quantities that require both magnitudes and direction to specify them are called vector quantities or vectors. e.g Displacement, velocity, force, momentum, weight etc.
Differences between Displacement and Distance.
|
Displacement |
Distance |
|
(i) It is vector quantity. (ii) It can be negative and positive. (iii) It can be zero. (iv) It is the shortest distance between two points. |
(i) It is scalar quantity. (ii) It cannot be negative. (iii) It cannot be zero. (iv) It is total path covered between to point. |
Use of distance and displacement:
(i) The displacement and distance are used to describe the overall motion of an object.
(ii) They are used to locate its final position with reference to its initial position at a given time.
Motion along a straight line:
The simplest type of motion is the motion along a straight line.
When an object moves on a straight path, such a motion is called motion along a straight line or Linear motion.
Examples:
Type of Motion:
(i) Uniform Motion: As the object covers equal distance in equal intervals of time it is said to be in uniform motion.
Example:
(ii) Non-uniform Motion: As the object does not covers equal distance in equal intervals of time it is said to be in uniform motion.
Uniform Motion:
When an object covers equal distance in equal intervals of time, it is said that the object is in uniform motion.
e.g: See table
| Time | Distance travelled by object A in m | Distance travelled by object B in m |
|
9:30 am 9:45 am 10:00 am 10:15 am 10:30 am 10:45 am 11:00 am |
10 20 30 40 50 60 70 |
12 19 23 35 37 41 44 |
Object A covers equal distance in equal time interval, while object B does not cover equal distance in equal time interval. Therefore it is said that object A is in uniform motion and object B is in non-uniform motion.
Finding rate of motion:
Rate of motion is found by the speed of an object.
Speed: The distance travelled by the object in per unit time is called speed.
The SI unit of speed is metre per second. symbolically it is written as m s-1 .
Avarage speed: The average speed of an object is obtained by dividing the total distance travelled by the total time taken.
If an object travels a distance s in time t then its speed v is,
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Ace your exams with CBSE Notes for Class 9 Science chapter 8. Motion: Distance and Displacement. These notes provide a clear explanation of important concepts, formulas, diagrams, and solved examples from the NCERT syllabus. Specially designed for Class 9 students, the notes are structured in a simple, point-wise manner to make revision quick and effective. Whether you are preparing for school tests, board exams, or competitive exams, these Science notes will boost your confidence and save valuable study time. You can also download Science class 9 chapter 8. Motion free PDF notes for offline learning. With easy-to-grasp language, exam tips, and well-organized content, these CBSE Science notes on chapter 8. Motion – Distance and Displacement are the perfect study companion for scoring high marks and mastering the subject.
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