Class 11 Physics — Chapter 4: LAWS OF MOTION

What you'll learn

• ▸Aristotle's Fallacy and the Law of Inertia
• ▸Newton's First Law of Motion
• ▸Newton's Second Law of Motion
• ▸Newton's Third Law of Motion
• ▸Conservation of Linear Momentum
• ▸Equilibrium of a Particle
• ▸Common Forces in Mechanics and Free-Body Diagrams
• ▸Dynamics of Circular Motion

Chapter Summary

--- PAGE 1 --- CHAPTER FOUR LAWS OF MOTION 4.1 Introduction 4.2 Aristotle's fallacy 4.3 The law of inertia 4.4 Newton's first law of motion 4.5 Newton's second law of motion 4.6 Newton's third law of motion 4.7 Conservation of momentum 4.8 Equilibrium of a particle 4.9 Common forces in mechanics 4.10 Circular motion 4.11 Solving problems in mechanics Summary Points to ponder Exercises 4.1 INTRODUCTION In the preceding Chapter, our concern was to describe the motion of a particle in space quantitatively. We saw that uniform motion needs the concept of velocity alone whereas non-uniform motion requires the concept of acceleration in addition. So far, we have not asked the question as to what governs the motion of bodies. In this chapter, we turn to this basic question. Let us first guess the answer based on our common experience. To move a football at rest, someone must kick it. To throw a stone upwards, one has to give it an upward push. A breeze causes…

Practice Questions from this Chapter

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1. Explain inertia simply. Get Solution →
2. Give real-world force examples. Get Solution →
3. Why do things stop moving? Get Solution →
4. According to the text, what is required to put a stationary body into motion or stop a moving body? Get Solution →
5. Which ancient Greek thinker held the view that an external force is required to keep a body in motion? Get Solution →
6. What is the property of a body to resist a change in its state of rest or uniform motion called? Get Solution →
7. Who formulated Galileo's law of inertia as the first law of motion? Get Solution →
8. What is Newton's first law of motion often called? Get Solution →

Did you know?

• 💡 A magician's tablecloth trick works because objects resist changes in motion.
• 💡 An object thrown in space could travel forever without stopping.
• 💡 You are constantly moving at over 1000 miles per hour just standing still on Earth.
• 💡 Ancient Greek thinkers believed force was always needed to keep things moving.
• 💡 Without friction, you could not walk, drive a car, or even hold a pencil.

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