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Laws of Motion — Revision Notes

ICSE · Class 9 · Physics

Laws of Motion revision notes for ICSE Class 9 Physics: 4 topics in quick points. Part of the ICSE Class 9 Physics syllabus.

43 questions35 flashcards4 formulas & key relations5 concepts

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Illustrations demonstrating the three types of inertia: inertia of rest, inertia of motion, and inertia of direction, using common real-world scenarios.
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Key Topics to Revise

1

1. Forces and Their Types

  • A force can change the state of rest or motion of a body.
  • A force can also change the size or shape of a body.
  • Contact forces act only when bodies are in physical contact.
2

2. Newton's First Law, Inertia, and Mass

  • A body at rest remains at rest unless an external force acts on it.
  • A body in motion continues with the same speed in the same direction unless an external force acts on it.
  • This law is also called the law of inertia.
3

3. Linear Momentum and Newton's Second Law

  • Linear momentum is the product of mass and velocity.
  • Momentum is a vector quantity in the direction of motion.
  • The SI unit of momentum is kg m s^-1.
4

4. Newton's Third Law of Motion

  • To every action there is always an equal and opposite reaction.
  • Action and reaction act on two different bodies.
  • They occur simultaneously.

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Full Notes

Key Concepts

A force is that physical causeContact forces act only when bodiesInertia is the property ofA body remains at restLinear momentum of a body

Frequently Asked Questions

What are the important topics in Laws of Motion for ICSE Class 9 Physics?
Key topics in Laws of Motion include Forces and Their Types, Newton's First Law, Inertia, and Mass, Linear Momentum and Newton's Second Law, Newton's Third Law of Motion. Study these first, then practise questions on each for Class 9 exams.
How should I revise Laws of Motion for Class 9 exams?
Learn the core ideas first, then work through the 43 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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