NCERT Class 11 Physics Part 1 Systems Of Particles and Rotational Motion

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NCERT Book for Class 11 Physics Chapter 7 System of Particles and Rotational Motion

Class 11 Physics students should refer to the following NCERT Book Chapter 7 System of Particles and Rotational Motion in Class 11. This NCERT Book for Class 11 Physics will be very useful for exams and help you to score good marks

Chapter 7 System of Particles and Rotational Motion NCERT Book Class 11

7.1 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 finite size. In dealing with the motion of extended bodies (bodies of finite size) often the idealised model of a particle is inadequate. In this chapter we shall try to go beyond this inadequacy. We shall attempt to build an understanding of
the motion of extended bodies. An extended body, in the first place, is a system of particles. We shall begin with the consideration of motion of the system as a whole. The centre of mass of a system of particles will be a key concept here. We shall discuss the motion of the centre of mass of a system of particles and usefulness of this concept in understanding the motion of extended bodies.
A large class of problems with extended bodies can be solved by considering them to be rigid bodies. Ideally a rigid body is a body with a perfectly definite and unchanging shape. The distances between all pairs of particles of such a body do not change. It is evident from this definition of a rigid body that no real body is truly rigid, since real bodies deform under the influence of forces. But in many situations the deformations are negligible. In a number of situations involving bodies such as wheels, tops, steel beams, molecules and planets on the other hand, we can ignore that they warp (twist out of shape), bend or vibrate and treat them as rigid.
 
7.1.1 What kind of motion can a rigid body have?
Let us try to explore this question by taking some examples of the motion of rigid bodies. Let us begin with a rectangular 
 
 NCERT Class 11 Physics Part 1 Systems Of Particles and Rotational Motion
 
 
Fig 7.1 Translational (sliding) motion of a block down an inclined plane.
(Any point like P1 or P2 of the block moves with the same velocity at any instant of time.)
 
block sliding down an inclined plane without any sidewise movement. The block is taken as a rigid body. Its motion down the plane is such that all the particles of the body are moving together, i.e. they have the same velocity at any instant of time. The rigid body here is in pure translational motion (Fig. 7.1).
In pure translational motion at any instant of time, all particles of the body have the same velocity.
 
 
 
Click on the below link to download NCERT Class 11 Physics Part 1 Systems Of Particles and Rotational Motion
Chapter 01 Physical World
NCERT Class 11 Physics Part 1 Physical World
Chapter 02 Units and Measurement
NCERT Class 11 Physics Part 1 Units And Measurement
Chapter 03 Motion in a Straight Line
NCERT Class 11 Physics Part 1 Motion In A Straight Line
Chapter 04 Motion in a Plane
NCERT Class 11 Physics Part 1 Motion In A Plane
Chapter 05 Laws of Motion
NCERT Class 11 Physics Part 1 Laws Of Motion
Chapter 06 Work Energy and Power
NCERT Class 11 Physics Part 1 Work Energy and Power
Chapter 07 System of Particles and Rotational Motion
NCERT Class 11 Physics Part 1 Systems Of Particles and Rotational Motion
Chapter 08 Gravitation
NCERT Class 11 Physics Part 1 Gravitation
Chapter 09 Mechanical Properties of Solids
NCERT Class 11 Physics Part 2 Mechanical Properties Of Solids
Chapter 10 Mechanical Properties of Fluids
NCERT Class 11 Physics Part 2 Mechanical Properties Of Fluids
Chapter 11 Thermal Properties of Matter
NCERT Class 11 Physics Part 2 Thermal Properties Of Matter
Chapter 12 Thermodynamics
NCERT Class 11 Physics Part 2 Thermodynamics
Chapter 13 Kinetic Theory
NCERT Class 11 Physics Part 2 Kinetic Theory
Chapter 14 Oscillations
NCERT Class 11 Physics Part 2 Oscillations
Chapter 15 Waves
NCERT Class 11 Physics Part 2 Waves
Other Chapters
CBSE Class 11 Physics Elastic and Inelastic
CBSE Class 11 Physics Errors in Measurement
CBSE Class 11 Physics Motion in a Vertical Circle
CBSE Class 11 Physics Non Conservative Forces
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Physics NCERT Book Class 11 Chapter 7 System of Particles and Rotational Motion

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NCERT Book Class 11 Physics Chapter 7 System of Particles and Rotational Motion

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Chapter 7 System of Particles and Rotational Motion NCERT Book Class 11 Physics

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