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Describing Motion Around Us

CBSE · Class 9 · Science

Quick revision notes for Describing Motion Around Us — CBSE Class 9 Science. Key concepts, formulas, and definitions for last-minute revision.

114 questions80 flashcards5 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?
Describing Motion Around Us covers several key topics that are frequently asked in CBSE Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Describing Motion Around Us — CBSE Class 9 Science?
Understand the core concepts first, then work through the 114 practice questions available for this chapter. Revise formulas and 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.

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