Describing Motion Around Us
CBSE · Class 9 · Science
Summary of Describing Motion Around Us for CBSE Class 9 Science. Key concepts, important points, and chapter overview.
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Motion is a change in position with time. It can be described using distance, displacement, speed, velocity, acceleration, graphs, and equations. Straight-line motion is the simplest form of motion, while circular motion shows how direction can change even when speed stays constant. The chapter buil
Key Concepts
Position is described by distance
Position is described by distance and direction from a fixed reference point. If position changes with time, the object is in motion; if it does not c
Distance travelled is the total path
Distance travelled is the total path length covered by an object. It is a scalar quantity and has only numerical value.
Displacement is the net change
Displacement is the net change in position between two instants of time. It has both magnitude and direction, so it is a vector quantity.
Average speed = total distance travelled
Average speed = total distance travelled / time interval. Speed is a scalar quantity and has the SI unit m/s.
Average velocity = displacement / time
Average velocity = displacement / time interval. It has the same SI unit as speed, m/s, but it is a vector quantity.
Learning Objectives
- Describe position using a reference point, distance, and direction.
- Distinguish between distance travelled and displacement.
- Differentiate between average speed and average velocity.
- Calculate average acceleration from change in velocity and time.
- Interpret position-time graphs and velocity-time graphs.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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