Describing Motion Around Us
CBSE · Class 9 · Science
Complete topic list for Describing Motion Around Us in CBSE Class 9 Science. Key concepts, sub-topics, and what to focus on for board exams.
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Explore the full setTopics in Describing Motion Around Us
1. Describing Position, Distance and Displacement
- Position is described with respect to a fixed reference point.
- For motion in a straight line, direction is shown by positive and negative signs.
- Instant of time and time interval are different: an instant is one clock reading, while a time interval is the duration between two readings.
2. Speed, Velocity and Average Values
- Average speed tells how fast an object moves without giving direction.
- Average velocity tells how fast position changes and in which direction.
- Average speed and average velocity have the same SI unit: m s⁻¹ or m/s.
3. Average Acceleration and Free Fall
- Acceleration is the rate of change of velocity.
- Average acceleration depends on change in velocity, not on speed alone.
- An object can move very fast and yet have zero acceleration if its velocity is constant.
4. Graphs of Motion
- Graphs help show how position, velocity, and acceleration change with time.
- A position-time graph for uniform motion is a straight line.
- A curved position-time graph shows non-uniform motion or accelerated motion.
Key Concepts
Central concept: Motion in straight line and motion in a plane
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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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