Class 11 Physics Notes

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Class 11 Physics Notes

One place for all your Class 11 Physics revision. Chapter-wise notes covering units and measurements, motion in a straight line and a plane, laws of motion, work-energy-power, the system of particles and rotational motion, gravitation, mechanical and thermal properties of matter, thermodynamics, kinetic theory, oscillations and waves — each with key formulas, exam pointers, MCQs and solved examples for CBSE, JEE and NEET.

Class:11Subject:PhysicsCovers:CBSE · JEE · NEET

8 Key Formulas

DWritten byDeep Narayan

UpdatedSeptember 2026

Key Concept Summary

What is covered in Class 11 Physics?

Class 11 Physics builds the core of mechanics and measurement: units and dimensions, kinematics, Newton's laws of motion, work, energy and power, rotational motion, gravitation, properties of matter, thermodynamics and oscillations.

About the Class 11 Physics Notes

These chapter-wise notes condense the entire Class 11 physics syllabus into quick-revision sheets. Each chapter page gives you the essential concepts, the key formulas together, exam pointers for the exam hall, and a quick FAQ answering the most-asked questions.

How to use these notes

Use each chapter page for last-minute revision: read the quick answer, scan the key formulas, then test yourself with the exam pointers. The formula sections double as a revision sheet right before the exam.

Measurement and Kinematics

Units and Measurements — SI units, dimensions, dimensional analysis, errors and significant figures.
Motion in a Plane — vectors, projectile motion and uniform circular motion.
Laws of Motion — Newton's three laws, impulse, friction and banking of roads.

Kinematics is the foundation

Units, vectors and projectile motion form the mathematical backbone used across all of physics. Master errors and dimensional analysis early — they appear repeatedly in JEE and NEET.

Mechanics and Dynamics

Force and momentum: F = ma and the conservation of momentum.
Work, energy and power — work-energy theorem and energy conservation.
Circular motion: centripetal force and its role in banking of roads.

Core mechanics formulas

F = \frac{d p}{d t} = m a, KE = \frac{1}{2} m v^{2}

Gravitation and Waves

Gravitation — the universal law F = Gm₁m₂/r², acceleration due to gravity and its variation, gravitational potential energy, escape velocity, Kepler's laws and satellite motion.
Waves — transverse and longitudinal waves, the speed of sound with the Laplace correction, standing waves in strings and organ pipes, beats and the Doppler effect.

Escape velocity and standing-wave frequencies

v_{e} = \frac{2 GM}{R} = 2 g R, f_{n} = \frac{n v}{2 L}

Two of the most-asked exam chapters

Escape velocity and orbital velocity (v₀ = √(GM/r)), geostationary satellites, harmonics of organ pipes and the Doppler shift are board and JEE/NEET favourites — both chapters carry full question banks in their dedicated notes pages.

Rotational Motion and Properties of Matter

System of Particles and Rotational Motion — centre of mass, torque and angular momentum, moment of inertia with the theorems of parallel and perpendicular axes, and rolling motion.
Mechanical Properties of Solids — stress and strain, Hooke's law, Young's, shear and bulk moduli, Poisson's ratio and elastic energy.
Mechanical Properties of Fluids — pressure and Pascal's law, Archimedes' principle, Bernoulli's equation, viscosity and surface tension.
Thermal Properties of Matter — temperature scales, thermal expansion, calorimetry and specific heat, latent heat, and heat transfer by conduction, convection and radiation.

Rotational, elastic and fluid formulas

τ = I α = \frac{d L}{d t}, Y = \frac{F L}{A Δ L}, P + \frac{1}{2} ρ v^{2} + ρ g h = constant

Heavy-weight exam chapters

Rotational motion, Bernoulli's principle and the elastic moduli feature prominently in JEE and NEET every year. Master the theorem of parallel axes, capillary rise and the kinetic theory before the exam.

Thermodynamics and Kinetic Theory

Thermodynamics — the zeroth and first laws, internal energy and work, isothermal and adiabatic processes, the second law and heat engines.
Kinetic Theory — the ideal gas equation, pressure and RMS speed, the kinetic interpretation of temperature, degrees of freedom and specific heats.

Thermodynamics and kinetic theory formulas

Δ Q = Δ U + Δ W, P V = n R T, v_{rms} = \frac{3 R T}{M}

Temperatures in kelvin, always

In thermodynamics and kinetic theory, every temperature must be in kelvin. The first law ΔQ = ΔU + ΔW and the ideal gas equation PV = nRT are the two formulas that anchor both chapters.

Oscillations

Simple harmonic motion — the condition a = −ω²x and sinusoidal motion.
Spring-mass and simple pendulum systems and their periods.
Energy in SHM, damped oscillations and resonance.

Spring and pendulum periods

T = 2 π \frac{m}{k}, T = 2 π \frac{L}{g}

Quick Revision

Key formulas at a glance

Memorise these equations — direct application numericals and derivations in CBSE & JEE frequently hinge on these.

Newton's second law

F = m a

Impulse

J = F Δ t = Δ p

Centripetal force

F_{c} = \frac{m v ^{2}}{r}

Banking angle

tan θ = \frac{v ^{2}}{r g}

Escape velocity

v_{e} = \frac{2 GM}{R} = 2 g R

Orbital velocity

v_{o} = \frac{GM}{r}

Pendulum period

T = 2 π \frac{L}{g}

Doppler effect

f^{'} = f \frac{v \pm v _{o}}{v \mp v _{s}}

Exam Strategy

How this chapter is asked

High-yield question patterns observed across CBSE boards, JEE Main & Advanced, and NEET.

Dimensions: force [MLT⁻²], energy [ML²T⁻²].
F = ma = dp/dt; impulse = change in momentum.
Projectile range is maximum at 45°.
Centripetal force always points toward the centre.
Spring period T = 2π√(m/k); pendulum T = 2π√(L/g).
Escape velocity vₑ = √(2gR) is √2 × the orbital velocity near the surface.
Closed organ pipes give only odd harmonics; Doppler frequency rises on approach.

FAQ

Frequently asked questions

How many chapters are there in Class 11 Physics?

The CBSE Class 11 physics syllabus contains around 10–15 chapters spanning mechanics, thermodynamics, properties of matter, waves and oscillations. This hub links each chapter's dedicated revision notes.

Is Class 11 physics important for JEE and NEET?

Yes — Class 11 mechanics, especially laws of motion, work-energy and circular motion, forms a large part of the JEE Main and NEET physics syllabus and the foundation for Class 12 topics.

What is the hardest topic in Class 11 physics?

Many students find rotational dynamics and the subtle applications of Newton's laws the most demanding. Break them into small diagram-based steps and practise free-body diagrams.

How should I revise Class 11 physics?

Practise the core formulas (F = ma, impulse, projectile, circular motion, oscillations), then solve numerical problems using each chapter's key-formulas section as a quick revision sheet.

Next Chapters

Continue learning

Units and Measurements Notes Class 11 Physics NCERT Solutions Class 11 Physics NCERT Solutions Motion in a Straight Line Notes Motion in a Plane Class 11 NCERT Solutions Laws of Motion Notes Work, Energy and Power Notes System of Particles & Rotational Motion Notes Gravitation Notes Mechanical Properties of Solids Notes Mechanical Properties of Fluids Notes Thermal Properties of Matter Notes Thermodynamics Notes Kinetic Theory Notes Oscillations Notes Waves Notes Physics Tutor in Mohali Class 12 Physics NCERT Solutions

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