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CBSE Notes for Class 9 Science chapter 8. Motion: Velocity, quick revision notes for Class 9 Science chapter 8. Motion Velocity, 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: Velocity 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)
Speed with Direction:
Velocity:
The direction of motion along with its speed. The quantity that
specifies both these aspects is called velocity.
Defintion: Velocity is the speed of an object moving in a definite direction. It is called velocity.
S.I unit of velocity is m/s or m s-1.
Type of Velocity:
(i) Uniform velocity: When an object covers equal displacement in equal time of interval. It is called uniform velocity.
(ii) Non-uniform velocity: When a object covers unequal displacement in equal time of interval. It is called non-uniform velocity.
(iii) Average velocity: Average velocity is given by the arithmetic mean of
initial velocity and final velocity for a given period of time.
Initial velocity : Initial velocity of an object means the velocity when the object starts displacing where time(t) may be zeto or t ≠ 0.
It is denrted by 'u'.
When object starts moving from rest then u = 0.
When an object is in motion then u ≠ 0. The value will be any integer.
Final velocity : Final velocity of an object is given by time t. It is the value of final position in velocity of the object.
Differences between speed and velocity;
Speed:
(i) It is a distance covered in unit time.
(ii) It is a scalar quantity.
(iii) Average speed of moving object can not be zero.
(iv) Speed of an object can never be zero.
Velocity:
(i) It is a displacement covered in unit time with direction.
(ii) It is a vector quantity.
(iii) Average velocity of moving object can be zero.
(iv) Velocity of an object can be positive, negative or zero.
When the object is moving in a straight line along positive direction and the distance and displacement of an two different objects are equal in same time then the value of speed and velocity will be equal.
Changing the velocity of an object:
(i) Change its magnitude.
(ii) To change its the direction.
(iii) To change its both magnitude and direction.
Locomotion:
Motion of animals is known as locomotion.
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Ace your exams with CBSE Notes for Class 9 Science chapter 8. Motion: Velocity. 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 – Velocity are the perfect study companion for scoring high marks and mastering the subject.
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