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CBSE Notes Class 11 Physics Rotational Motion

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December 24, 2019
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Class 11 Physics Rotational Motion – Get here the Notes for Class 11 Physics Rotational Motion. Candidates who are ambitious to qualify the Class 11 with good score can check this article for Notes. This is possible only when you have the best CBSE Class 11 Physics study material and a smart preparation plan. To assist you with that, we are here with notes. Hope these notes will helps you understand the important topics and remember the key points for exam point of view. Below we provided the Notes of Class 11 Physics for topic Rotational Motion.

  • Class: 11th
  • Subject: Physics
  • Topic: Rotational Motion
  • Resource: Notes

CBSE Notes Class 11 Physics Rotational Motion

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Candidates who are pursuing in Class 11 are advised to revise the notes from this post. With the help of Notes, candidates can plan their Strategy for particular weaker section of the subject and study hard. So, go ahead and check the Important Notes for Class 11 Physics Rotational Motion from this article.

Centre of Mass

Centre of mass of a system is the point that behaves as whole mass of the system is concentrated at it and all external forces are acting on it.

For rigid bodies, centre of mass is independent of the state of the body i.e., whether it is in rest or in accelerated motion centre of mass will rermain same.

Centre of Mass of System of n Particles

If a system consists of n particles of masses m1, m2, m3 ,… mn having position vectors rl, r2, r3,… rn. then position vector of centre of mass of

CBSE Class 11 Physics Notes Rotational Motion

Centre of Mass of Two Particle System

Choosing O as origin of the coordinate axis.

CBSE Class 11 Physics Notes Rotational Motion

(ii) Position of centre of mass from m2 = (m1d) / m1 + m2

CBSE Class 11 Physics Notes Rotational Motion

iii) If position vectors of particles of masses m1 and m2 are r1 and r2respectively, then

CBSE Class 11 Physics Notes Rotational Motion

(iv) If in a two particle system, particles of masses m1 and m2 moving with velocities v1 and v2 respectively, then velocity the centre of mass

(v) If accelerations of the particles are a1, and a1respectively, then acceleration of the centre of mass

CBSE Class 11 Physics Notes Rotational Motion

(vi) Centre of mass of an isolated system has a constant velocity.

(vii) It means isolated system will remain at rest if it is initially rest or will move with a same velocity if it is in motion initially.

(viii) The position of centre of mass depends upon the shape, size and distribution of the mass of the body.

(ix) The centre of mass of an object need not to lie with in the object.

(x) In symmetrical bodies having homogeneous distribution mass the centre of mass coincides with the geometrical centre the body.

(xi) The position of centre of mass of an object changes translatory motion but remains unchanged in rotatory motion,

Translational Motion

A rigid body performs a pure translational motion, if each particle the body undergoes the same displacement in the same direction in given interval of time.

Rotational Motion

A rigid body performs a pure rotational motion, if each particle of the body moves in a circle, and the centre of all the circles lie on a straight line called the axes of rotation.

Rigid Body

If the relative distance between the particles of a system do not changes on applying force, then it called a rigtd body. General motion of a rigid body consists of both the translational motion and the rotational motion.

Moment of Inertia

The inertia of rotational motion is called moment of inertia. It is denoted by L.

Moment of inertia is the property of an object by virtue of which it opposes any change in its state of rotation about an axis.

The moment of inertia of a body about a given axis is equal to the sum of the products of the masses of its constituent particles and the square of their respective distances from the axis of rotation.

CBSE Class 11 Physics Notes Rotational Motion

Its unit is kg.m2 and its dimensional formula is [ML2].

The moment of inertia of a body depends upon

  • position of the axis of rotation
  • orientation of the axis of rotation
  • shape and size of the body
  • distribution of mass of the body about the axis of rotation.

The physical significance of the moment of inertia is same in rotational motion as the mass in linear motion.

The Radius of Gyration

The root mean square distance of its constituent particles from the axis of rotation is called the radius of gyration of a body.

It is denoted by K.

CBSE Class 11 Physics Notes Rotational Motion

Radius of gyration

The product of the mass of the body (M) and square of its radius gyration (K) gives the same moment of inertia of the body about rotational axis.

Therefore, moment of inertia I = MK2 ⇒ K = √1/M

CBSE Class 11 Physics Notes Rotational Motion

Parallel Axes Theorem

The moment of inertia of any object about any arbitrary axes is equal to the sum of moment of inertia about a parallel axis passing through the centre of mass and the product of mass of the body and the square of the perpendicular distance between
the two axes.

Mathematically I = ICM + Mr2

where I is the moment of inertia about the arbitrary axis, IcM is moment of inertia about the parallel axis through the centre of mass, M is the total mass of the object and r is the perpendicular distance between the axis.

CBSE Class 11 Physics Notes Rotational Motion

Perpendicular Axes Theorem

The moment of inertia of any two dimensional body about an axis perpendicular to its plane (Iz) is equal to the sum of moments of inertia of the body about two mutually perpendicular axes lying in its own plane and intersecting
each other at a point, where the perpendicular axis passes through it.

Mathematically Iz = Ix + Iy

where Ix and Iy are the moments of inertia of plane lamina about perpendicular axes X and Y respectively which lie in the plane lamina an intersect each other.

Theorem of parallel axes is applicable for any type of rigid body whether it is a two dimensional or three dimensional, while the theorem of perpendicular is applicable for laminar type or two I dimensional bodies only.

Moment of Inertia of Homogeneous Rigid Bodies

For a Thin Circular Ring

CBSE Class 11 Physics Notes Rotational Motion

For a Circular Disc

CBSE Class 11 Physics Notes Rotational Motion

For a Thin Rod

CBSE Class 11 Physics Notes Rotational Motion

For a Solid Cylinder

CBSE Class 11 Physics Notes Rotational Motion

For a Rectangular Plate

CBSE Class 11 Physics Notes Rotational Motion

For a Thin Spherical Shell

CBSE Class 11 Physics Notes Rotational Motion

For a Solid Sphere

CBSE Class 11 Physics Notes Rotational Motion

Equations of Rotational Motion
(i) ω = ω0 + αt
(ii) θ = ω0t + 1/2 αt2
(iii) ω2 = ω02 + 2αθ
where θ is displacement in rotational motion, ω0 is initial velocity, omega; is final velocity and a is acceleration.

Torque

Torque or moment of a force about the axis of rotation

τ = r x F = rF sinθ n

It is a vector quantity.
If the nature of the force is to rotate the object clockwise, then torque is called negative and if rotate the object anticlockwise, then it is called positive.

Its SI unit is ‘newton-metre’ and its dimension is [ML2T-2].

In rotational motion, torque, τ = Iα

where a is angular acceleration and 1is moment of inertia.

Angular Momentum
The moment of linear momentum is called angular momentum.

It is denoted by L.
Angular momentum, L = I ω = mvr
In vector form, L = I ω = r x mv
Its unit is ‘joule-second’ and its dimensional formula is [ML2T-1].

Torque, τ = dL/dt

Conservation of Angular Momentum

If the external torque acting on a system is zero, then its angular momentum remains conserved.
If τext 0, then L = I(ω) = constant ⇒ I1ω1== I2ω2

Angular Impulse

Total effect of a torque applied on a rotating body in a given time is called angular impulse. Angular impulse is equal to total change in angular momentum of the system in given time. Thus, angular impulse

CBSE Class 11 Physics Notes Rotational Motion

Class 11 Key Points, Important Questions & Practice Papers

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Hope these notes helped you in your schools exam preparation. Candidates can also check out the Key Points, Important Questions & Practice Papers for various Subjects for Class 11 in both Hindi and English language form the link below.

Class 11 Physicsकक्षा 11 अर्थशास्त्र
Class 11 Chemistryकक्षा 11 समाज शास्त्र
Class 11 Mathsकक्षा 11 शारीरिक शिक्षा
Class 11 Biologyकक्षा 11 राजनीति विज्ञान
Class 11 Business Studiesकक्षा 11 इतिहास
Class 11 Accountancyकक्षा 11 भूगोल 
Class 11 Sociology
Class 11 Physical Education
Class 11 English

 Class 11 NCERT Solutions

Candidates who are studying in Class 11 can also check Class 11 NCERT Solutions from here. This will help the candidates to know the solutions for all subjects covered in Class 11th. Candidates can click on the subject wise link to get the same. Class 11 Chapter-wise, detailed solutions to the questions of the NCERT textbooks are provided with the objective of helping students compare their answers with the sample answers.

  • Biology
  • Chemistry
  • Physics
  • Mathematics
  • English
  • Hindi
  • Business Studies

Class 11 Mock Test / Practice

Mock test are the practice test or you can say the blue print of the main exam. Before appearing in the main examination, candidates must try mock test as it helps the students learn from their mistakes. With the help of Class 11 Mock Test / Practice, candidates can also get an idea about the pattern and marking scheme of that examination. For the sake of the candidates we are providing Class 11 Mock Test / Practice links below.

  • Maths
  • Physics
  • Chemistry
  • Biology

 Class 11 Exemplar Questions

Exemplar Questions Class 11 is a very important resource for students preparing for the Examination. Here we have provided Exemplar Problems Solutions along with NCERT Exemplar Problems Class 11. Question from very important topics is covered by Exemplar Questions for Class 11.

Physicsरसायन विज्ञान
Chemistryजीव विज्ञान
Maths
Biology

CBSE Notes for Class 11 Physics Notes Biology Notes Maths Notes Chemistry Notes

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