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Motion

Bihar Board · Class 9 · Science

Quick revision notes for Motion — Bihar Board Class 9 Science. Key concepts, formulas, and definitions for last-minute revision.

31 questions20 flashcards5 concepts

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An illustration showing a person inside a moving bus perceiving fellow passengers at rest, while a person outside the bus perceives the bus and its passengers as moving. Roadside trees are shown movin
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Key Topics to Revise

1

7.1 Describing Motion

  • Motion is the change in position of an object with respect to time and a reference point
  • A reference point (origin) is essential to describe the position of any object
  • Objects can appear to be in motion for one observer and at rest for another (relative motion)
2

7.1.2 Uniform and Non-uniform Motion

  • Uniform Motion: Object covers equal distances in equal intervals of time
  • Non-uniform Motion: Object covers unequal distances in equal intervals of time
  • Time intervals considered should be small for accurate description
3

7.2 Measuring Rate of Motion - Speed

  • Speed measures how fast an object moves - distance covered per unit time
  • SI unit of speed is m/s or ms⁻¹, other units include cm/s and km/h
  • Speed is always positive and is a scalar quantity
4

7.2.1 Speed with Direction - Velocity

  • Velocity is speed in a definite direction - vector quantity
  • Velocity can change by changing speed, direction, or both
  • Average velocity = (Initial velocity + Final velocity) ÷ 2 (for uniform acceleration)

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Full Notes

Key Concepts

To describe the location ofDistance is the total path lengthSpeed is the distance covered perUniform motionAcceleration is the rate of change

Frequently Asked Questions

What are the important topics in Motion for Bihar Board Class 9 Science?
Key topics in Motion include Distance vs Displacement: The Correct Decision Path, Motion - Complete Chapter Concept Overview, Chapter 7 Motion – Complete Concept Map. These are the concepts Bihar Board Class 9 examiners draw on most — study them first, then practise related questions.
How to score full marks in Motion — Bihar Board Class 9 Science?
Understand the core concepts first, then work through the 31 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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