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Revision Notes

Laws of Motion — Revision Notes

CBSE · Class 11 · Physics

Laws of Motion revision notes for CBSE Class 11 Physics: 4 topics in quick points. Part of the CBSE Class 11 Physics syllabus.

125 questions72 flashcards6 formulas & key relations5 concepts

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Key Topics to Revise

1

1. Aristotle’s Fallacy and the Law of Inertia

  • Aristotle held the flawed view that an external force is needed to keep a body moving.
  • Everyday experience can mislead because friction usually opposes motion and makes moving bodies slow down.
  • Galileo studied motion on inclined planes and inferred the law of inertia.
2

2. Newton’s First Law and Inertia in Daily Situations

  • If a body is at rest or moving with uniform velocity, the net external force on it is zero.
  • The first law explains why a stationary bus passenger lurches backward when the bus starts suddenly.
  • When a bus stops suddenly, the body continues moving forward due to inertia.
3

3. Momentum and Newton’s Second Law

  • Momentum is a vector quantity.
  • Momentum depends on both mass and velocity.
  • A greater change in momentum in a given time needs a greater force.
4

4. Impulse and Force-Time Relation

  • Impulse is the product of force and time duration.
  • Impulse equals change in momentum.
  • Impulse becomes important when a large force acts for a very short time.

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Full Notes

Key Concepts

The idea that an external forceA body remains at restMomentum is defined by p =The rate of change of momentumImpulse = force × time duration

Frequently Asked Questions

What are the important topics in Laws of Motion for CBSE Class 11 Physics?
Key topics in Laws of Motion include Aristotle’s Fallacy and the Law of Inertia, Newton’s First Law and Inertia in Daily Situations, Momentum and Newton’s Second Law, Impulse and Force-Time Relation. Study these first, then practise questions on each for Class 11 exams.
How should I revise Laws of Motion for Class 11 exams?
Learn the core ideas first, then work through the 125 practice questions on Laws of Motion. 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.

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