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Laws of Motion

Uttar Pradesh Board · Class 11 · Physics

Quick revision notes for Laws of Motion — Uttar Pradesh Board Class 11 Physics. Key concepts, formulas, and definitions for last-minute revision.

60 questions24 flashcards5 concepts

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Key Topics to Revise

1

Historical Background and Aristotle's Fallacy

  • Aristotle believed that external force is required to keep a body in uniform motion - this was incorrect
  • Galileo's revolutionary insight: uniform motion and rest are equivalent states - both require zero net force
  • Galileo's inclined plane experiments showed that objects move with constant velocity on frictionless horizontal surfaces
2

Newton's First Law of Motion (Law of Inertia)

  • Every body continues in its state of rest or uniform motion in a straight line unless compelled by external force
  • First law applies when net external force is zero
  • If net force = 0, then acceleration = 0
3

Newton's Second Law of Motion

  • Rate of change of momentum is proportional to applied force and occurs in direction of force
  • For constant mass: F = ma
  • For variable mass: F = dp/dt
4

Newton's Third Law of Motion

  • To every action, there is always an equal and opposite reaction
  • Forces always occur in pairs between two bodies
  • Action and reaction forces act simultaneously, not sequentially

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Full Notes

Key Concepts

Aristotle incorrectly believed that external forceEvery body continues to beThe rate of change of momentumMomentum (p) is the productImpulse is the product of force

Frequently Asked Questions

What are the important topics in Laws of Motion for Uttar Pradesh Board Class 11 Physics?
Laws of Motion covers several key topics that are frequently asked in Uttar Pradesh Board Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Laws of Motion — Uttar Pradesh Board Class 11 Physics?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision 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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