NCERT Class 11 Physics Book Physics Part I: What’s Inside

The NCERT Class 11 Physics book Physics Part I is the official NCERT textbook for Class 11 Physics, and the official PDF of every chapter is on this page. Seven chapters run from Units and Measurement to Gravitation across 143 printed pages, each linked straight from NCERT’s own site in the download table below.

The PDF alone does not tell you what is inside the book. This page adds that layer: every chapter’s named sections with their printed page numbers, its indexed figures and its end-of-chapter exercise counts, measured from the textbook’s own text.

That is how you compare chapters — where the figures sit, where the numerical practice concentrates, which chapters you can revise fastest — before opening a single file.

Download the NCERT Class 11 Physics Book Physics Part I PDF

All seven chapter files are NCERT’s own, published on the official NCERT textbook portal — the ncert.nic.in domain every link above points to, so the downloads need no login and no fee.

Each row is one chapter of the Class 11 Physics textbook PDF: open it to read the chapter on screen, or save it for offline revision before moving to the study pages further down.

Class 11 Physics book PDF at a glance

• 7 chapters, from Units and Measurement to Gravitation.
• 7 verified official PDFs, all linked in the download table above.
• 143 printed pages across the book.
• 82 named sections — each one of NCERT’s own numbered headings.
• 70 verified numbered figures indexed from the textbook.
• All 7 chapters have a study page in the chapter-pages block below.

These counts come from the NCERT textbook entries on this page, not from the CBSE subject scheme.

Physics Class 11 NCERT chapters: what each one teaches

What the columns count: a section is one of NCERT’s own numbered headings, a figure is a numbered figure indexed from the textbook, and a question is an end-of-chapter exercise.

Across the seven chapters the exercise counts add to 138 — every one at the end of a chapter, because the book prints zero activities and zero in-text questions. Only Chapters 4 and 7 close with a printed ‘Points to Ponder’ recap; the other five end with no summary, so the section headings are the revision skeleton for most of the book.

Chapter 1: Units and Measurement (pp. 1-12)

This is the rules chapter of the book. It fixes the SI system that every later measurement assumes, sets the rules for significant figures and uncertainty, then introduces dimensions, dimensional formulae and dimensional analysis — the tool that checks whether an equation is physically possible before you trust its numbers.

1. The International System of Units (p. 1)
2. Significant Figures (p. 3)
3. Dimensions of Physical Quantities (p. 7)
4. Dimensional Formulae and Dimensional Equations (p. 7)
5. Dimensional Analysis and its Applications (p. 7)

The chapter’s sub-rules sit inside these headings: arithmetic with significant figures, rounding uncertain digits, uncertainty in arithmetic results, checking dimensional consistency and deducing relations between quantities — exactly the skills every later numerical answer depends on.

At 12 pages, with 1 indexed figure and 16 exercise questions (22 parts), this is the shortest and least figure-heavy chapter in the book, and the one whose rules every later numerical assumes.

Chapter 2: Motion in a Straight Line (pp. 13-26)

This chapter trains you to read motion from graphs. Instantaneous velocity is the slope of the tangent to a position-time graph, acceleration is read from the same graphs, and the kinematic equations for uniformly accelerated motion grow out of them — with free fall as the worked case throughout.

1. Instantaneous Velocity and Speed (p. 14)
2. Acceleration (p. 15)
3. Kinematic Equations for Uniformly Accelerated Motion (p. 17)

Its 7 indexed figures carry most of the teaching: position-time graphs, velocity-time graphs, the area under a velocity-time curve as displacement, free fall and even a reaction-time experiment. Its 18 questions split into 33 parts — the largest number of parts in the book, because several graph-reading exercises ask for multiple values from one figure.

If graphs feel hard, this is the chapter that fixes that.

Chapter 3: Motion in a Plane (pp. 27-48)

This is the vector toolkit. It starts with scalars and vectors, multiplication of vectors by real numbers, graphical addition and subtraction, resolution and analytical addition, then applies the same machinery to motion in a plane — position and displacement vectors, motion with constant acceleration, projectile motion and uniform circular motion.

1. Scalars and Vectors (p. 27)
2. Multiplication of Vectors by Real Numbers (p. 29)
3. Addition and Subtraction of Vectors — Graphical Method (p. 29)
4. Resolution of Vectors (p. 31)
5. Vector Addition – Analytical Method (p. 33)
6. Motion in a Plane (p. 34)
7. Motion in a Plane with Constant Acceleration (p. 37)
8. Projectile Motion (p. 38)
9. Uniform Circular Motion (p. 40)

With 15 of the book’s 70 figures and 22 questions (28 parts), this is the dependence hub of the book: Chapter 4 assumes its vector language and Chapter 6 assumes its vector product.

Chapter 4: Laws of Motion (pp. 49-70)

The chapter’s closing ‘Points to Ponder’ presses the distinctions that decide numerical answers. Force is not always in the direction of motion — it may be along, opposite or perpendicular to the velocity, and it is always parallel to the acceleration.

A body momentarily at rest is not necessarily under zero force; force depends on the present situation, not the body’s history; and in \(\mathbf{F} = m\mathbf{a}\), \(\mathbf{F}\) is the net external force while \(m\mathbf{a}\) is the effect, not a separate force.

1. Aristotle’s Fallacy (p. 50)
2. The Law of Inertia (p. 50)
3. Newton’s Second Law of Motion (p. 53)
4. Newton’s Third Law of Motion (p. 56)
5. Conservation of Momentum (p. 57)
6. Equilibrium of a Particle (p. 58)
7. Common Forces in Mechanics (p. 59), with Friction (p. 60)
8. Circular Motion (p. 63)
9. Solving Problems in Mechanics (p. 64)

With 10 figures and 21 questions (30 parts), this is the conceptual core of mechanics — the chapter that turns vector mathematics into physical judgment.

Chapter 5: Work, Energy and Power (pp. 71-91)

This chapter builds the energy approach. It opens with the scalar product, builds the work-energy theorem, defines work and kinetic energy, and extends the idea to variable forces.

It then introduces potential energy and the conservation of mechanical energy, works out the spring, and closes with power and collisions — elastic and inelastic, in one and two dimensions.

1. Notions of Work and Kinetic Energy: the Work-Energy Theorem (p. 73)
2. Work (p. 73)
3. Kinetic Energy (p. 74)
4. Work Done by a Variable Force (p. 75)
5. The Work-Energy Theorem for a Variable Force (p. 76)
6. The Concept of Potential Energy (p. 77)
7. The Conservation of Mechanical Energy (p. 78)
8. The Potential Energy of a Spring (p. 80)
9. Power (p. 83)
10. Collisions (p. 83)

Its 9 figures are modest, but its 23 exercise questions are the heaviest load in the book, spread over 21 pages. For numerical practice, this is where the book concentrates it.

Chapter 6: Systems of Particles and Rotational Motion (pp. 92-126)

This is the longest and hardest chapter in the book. It classifies rigid-body motion and defines the centre of mass and its motion, then introduces the vector product, angular velocity, torque and angular momentum.

From there it covers equilibrium of rigid bodies, centre of gravity, moment of inertia, and the kinematics and dynamics of rotation about a fixed axis — ending with conservation of angular momentum.

1. Centre of Mass (p. 95)
2. Motion of Centre of Mass (p. 99)
3. Linear Momentum of a System of Particles (p. 100)
4. Vector Product of Two Vectors (p. 101)
5. Angular Velocity and its Relation with Linear Velocity (p. 103)
6. Torque and Angular Momentum (p. 105)
7. Equilibrium of a Rigid Body (p. 109)
8. Moment of Inertia (p. 114)
9. Kinematics of Rotational Motion About a Fixed Axis (p. 116)
10. Dynamics of Rotational Motion About a Fixed Axis (p. 118)

At 35 pages it holds 18 of the book’s 82 sections and 21 of its 70 figures, yet sets only 17 questions — the weight of the chapter sits in derivations, not numerical practice. It assumes Chapter 3’s vector product throughout.

Chapter 7: Gravitation (pp. 127-143)

The closing ‘Points to Ponder’ makes three points worth carrying into numericals. Under gravitational motion, angular momentum and total mechanical energy are conserved while linear momentum is not; angular momentum conservation produces Kepler’s second law and holds for any central force, not just the inverse-square law; and the same Kepler third-law constant that governs the planets also applies to satellites.

Weightlessness in orbit is shared free fall — both astronaut and satellite fall together — not the absence of gravity.

1. Kepler’s Laws (p. 128)
2. Universal Law of Gravitation (p. 129)
3. The Gravitational Constant (p. 131)
4. Acceleration Due to Gravity of the Earth (p. 132)
5. Acceleration Due to Gravity Below and Above the Surface of Earth (p. 133)
6. Gravitational Potential Energy (p. 134)
7. Escape Speed (p. 135)
8. Earth Satellites (p. 137)
9. Energy of an Orbiting Satellite (p. 138)

With 7 figures and 21 questions, it builds directly on Chapter 5’s potential energy and Chapter 6’s angular momentum — the book ends where its tools converge.

Class 11 Physics chapters: study pages

Every chapter in this book has its own study page on this site, where its concepts, figures and exercises are worked through in depth.

How to use the Class 11 Physics book

A working order for this book, based on how the chapters depend on each other:

1. Chapter 1 first. Units, significant figures and dimensions govern every numerical answer that follows.
2. Chapter 2. Train reading position-time and velocity-time graphs before you use the kinematic equations.
3. Chapter 3. The vector toolkit (pp. 27-33) is the tool Chapter 4 assumes.
4. Chapter 4. The conceptual core of mechanics.
5. Chapter 5. The energy approach, and the book’s heaviest question set.
6. Chapter 6. Study it after Chapter 3’s vector product and Chapter 5’s energy ideas are in place.
7. Chapter 7. Builds on potential energy (Ch 5) and angular momentum (Ch 6).

Where the work sits in this book

Common study mistakes with this book

Textbook contents and the examinable syllabus are not always identical — check the current official CBSE syllabus for Class 11 Physics before deciding what to revise. This page covers Physics Part I only; the rest of Class 11 Physics sits in the separate Physics Part II book, which this directory does not index.

Related NCERT book pages

• Class 11 NCERT books hub — every Class 11 subject on this page.
• NCERT books index — the full directory of NCERT textbooks by class.

Sources and data verification

This listing is maintained for the 2026-27 academic session using the NCERT textbook information available to us. NCERT remains the authority for confirming the latest edition.

• The figure counts, section counts and page numbers on this page come from the NCERT Class 11 Physics Part I textbook editions on this page.
• This page covers the 7 chapters of Physics Part I — not Physics Part II, not other Class 11 subjects, and not the CBSE subject scheme.
• This listing is maintained for the current academic session against the NCERT information available to us.
• NCERT settles textbooks, editions and PDFs; the CBSE settles the curriculum, syllabus and examinations.

Reference: NCERT Class 11 Physics textbook, official edition on ncert.nic.in. Figure captions and section titles quoted from the textbook; page references are to the official PDF.

Class 11 Physics Part I: quick answers

How many chapters are in the NCERT Class 11 Physics book Physics Part I?

Seven chapters, from Units and Measurement through Gravitation, across 143 printed pages. Chapter 6, Systems of Particles and Rotational Motion, is the longest at 35 pages.

Is the Class 11 Physics Part I PDF free and official?

Yes — the links in the download table above are NCERT’s own files on ncert.nic.in, free to download. No login or payment is needed.

Which chapter of Class 11 Physics Part I covers vectors and projectile motion?

Chapter 3, Motion in a Plane (pp. 27-48). Vectors, their addition and resolution, projectile motion and circular motion all sit there.

Which chapter has the most exercise questions in this book?

Chapter 5, Work, Energy and Power, with 23 exercise questions — the most in the book, spread over 21 pages.

Does this page cover the Class 11 Physics Part 2 book as well?

No — this page indexes Physics Part I only. The rest of Class 11 Physics sits in the separate Part II book, which this page does not cover.