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Describing Motion Around Us — Revision Notes

CBSE · Class 9 · Science

Describing Motion Around Us revision notes for CBSE Class 9 Science: 4 topics in quick points. Part of the CBSE Class 9 Science syllabus.

114 questions80 flashcards7 formulas & key relations5 concepts

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An illustration of J.J. Thomson's atomic model, depicting an atom as a sphere of uniformly distributed positive charge with electrons (plums) embedded within it.
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Key Topics to Revise

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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.
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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.
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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.
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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.

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Full Notes

Key Concepts

Position is described by distanceDistance travelled is the total pathDisplacement is the net changeAverage speed = total distance travelledAverage velocity = displacement / time

Frequently Asked Questions

What are the important topics in Describing Motion Around Us for CBSE Class 9 Science?
Key topics in Describing Motion Around Us include Describing Position, Distance and Displacement, Speed, Velocity and Average Values, Average Acceleration and Free Fall, Graphs of Motion. Study these first, then practise questions on each for Class 9 exams.
How should I revise Describing Motion Around Us for Class 9 exams?
Learn the core ideas first, then work through the 114 practice questions on Describing Motion Around Us. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Describing Motion Around Us

All CBSE Class 9 Science Revision Notes

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