Class 11 Physics — Chapter 6: SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

What you'll learn

• ▸Centre of Mass
• ▸Motion of Centre of Mass
• ▸Rigid Bodies and Types of Motion
• ▸Vector Product of Two Vectors
• ▸Torque and Angular Momentum
• ▸Equilibrium of a Rigid Body
• ▸Moment of Inertia
• ▸Kinematics and Dynamics of Rotational Motion
• ▸Rotation with a Moving Axis (Precession)

Chapter Summary

--- PAGE 1 --- CHAPTER SIX SYSTEMS OF PARTICLES AND ROTATIONAL MOTION 6.1 Introduction 6.2 Centre of mass 6.3 Motion of centre of mass 6.4 Linear momentum of a system of particles 6.5 Vector product of two vectors 6.6 Angular velocity and its relation with linear velocity 6.7 Torque and angular momentum 6.8 Equilibrium of a rigid body 6.9 Moment of inertia 6.10 Kinematics of rotational motion about a fixed axis 6.11 Dynamics of rotational motion about a fixed axis 6.12 Angular momentum in case of rotation about a fixed axis Summary Points to Ponder Exercises 6.1 INTRODUCTION In the earlier chapters we primarily considered the motion of a single particle. (A particle is ideally represented as a point mass having no size.) We applied the results of our study even to the motion of bodies of finite size, assuming that motion of such bodies can be described in terms of the motion of a particle. Any real body which we encounter in daily life has a …

Practice Questions from this Chapter

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1. Explain rigid body motion simply. Get Solution →
2. Show real examples of rotation. Get Solution →
3. Calculate center of mass quickly. Get Solution →
4. According to the text, what is the ideal definition of a rigid body? Get Solution →
5. In pure translational motion, what is true for all particles of the body at any instant of time? Get Solution →
6. What is the term for the fixed line about which a rigid body rotates? Get Solution →
7. Which of the following is given in the text as an example of rotation about a fixed axis? Get Solution →
8. In the rotation of a rigid body about a fixed axis, what path does every particle not on the axis move in? Get Solution →

Did you know?

• 💡 Earth's rotation is slowing down, making our days slightly longer over millions of years.
• 💡 High-wire walkers carry a long pole to lower their center of mass for better balance.
• 💡 Gymnasts spin faster by pulling their arms in, conserving angular momentum.
• 💡 A cat can right itself in mid-air by changing its body's center of mass.
• 💡 Gyroscopes use rotation to maintain orientation, found in phones and airplanes.

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