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Motion

Uttar Pradesh Board · Class 9 · Science

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

31 questions20 flashcards5 concepts

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A line graph showing distance on the Y-axis and time on the X-axis, depicting a straight line passing through the origin, representing uniform speed. Includes labels for calculating speed from the slo
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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 Uttar Pradesh 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 Uttar Pradesh Board Class 9 examiners draw on most — study them first, then practise related questions.
How to score full marks in Motion — Uttar Pradesh 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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