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Physics notes for Class 11 and 12
Mechanics to modern physics, built to JEE Advanced depth and safe for NEET. Every concept gets a drawing, every chapter gets worked numericals.
- Class 11 · Chapter notes
Work, Power and Energy
Work is done only when a force moves something along its own direction: W = Fd cosθ. The work done by all forces equals the change in kinetic energy, which is the work-energy theorem. When no friction acts, kinetic and potential energy simply trade places, so total mechanical energy stays constant. Power is how fast that work happens.
- Class 12 · PYQ set
Current Electricity
Most JEE questions on Current Electricity come back to a handful of shapes: a stretched wire changing resistance, a meter bridge balance point, a potentiometer comparison, internal resistance under load, and combinations of cells. This set works through twenty-six of them at Main and Advanced level, with the full solution shown each time.
- Class 11 · Chapter notes
Circular Motion
Every circular motion problem reduces to one question: which real force is pointing at the centre? Nothing supplies a new force. Gravity, normal reaction, tension or friction take that job, and the answer follows from writing mv²/r for whichever one it is. Banking, vertical circles and the rotor are all the same question asked three ways.
- Class 11 · Chapter notes
Friction and Block Systems
Friction is the force students guess at. The fix is a test you can run every time: work out how much friction the situation needs, then compare it with the most that is available, which is μN. If the need is smaller, friction supplies exactly the need and nothing slips. If it is larger, the surfaces slide.
- Class 11 · Chapter notes
Vectors and Kinematics
Vectors are not a chapter you finish. They are the language every later chapter of physics is written in. A vector needs both size and direction, adds tip to tail, and splits into components along any two perpendicular directions you choose. Kinematics is the first place that language gets used in anger.
- Class 11 · Chapter notes
Relative Motion
Relative motion runs on one rule: the velocity of A relative to B is v(A) minus v(B). Get that subtraction the right way round and river crossing, the rain-and-umbrella problem and closest approach all collapse into ordinary kinematics. Getting it backwards is the single most common way marks are lost here.
- Class 12 · Chapter notes
Current Electricity
Current Electricity is one of the most reliably scoring chapters in NEET Physics, and nearly every question comes from four ideas: drift velocity behind the current, Ohm's law with resistivity, series and parallel combinations, and the balanced Wheatstone bridge. Learn those four properly and the chapter stops producing surprises.
- Class 11 · Chapter notes
Motion in a Straight Line and in a Plane
Kinematics describes motion without asking what caused it. Three equations cover constant acceleration, graphs turn them into something you can read at a glance, and projectile motion is just those equations applied separately to two perpendicular directions. Relative velocity then handles every problem where two things move at once.
- Class 12 · Practice set
Electrostatics
Electrostatics questions separate into two levels. Level 1 asks you to apply Coulomb's law, field and potential directly. Level 2 asks you to superpose several contributions, handle a dipole, or pick the right Gaussian surface. This set works through ten of each, with the full solution shown every time.
- Class 12 · PYQ set
Electrostatics
JEE Main returns to a small set of Electrostatics shapes: dividing a charge to maximise the force between the parts, the field on the axis of a ring, a dipole in a uniform field, choosing a Gaussian surface, and rearranging a capacitor network. This set works through fifteen of them with full solutions.
- Class 11 · PYQ set
Errors in Measurement
Error questions are decided by one habit: track which operation you performed. Absolute errors add when quantities are added or subtracted; relative errors add when they are multiplied or divided, and multiply by the power when a quantity is raised to one. Almost every mark lost here comes from mixing those two rules up.
- Class 11 · Chapter notes
Unit Conversion and Dimensional Analysis
Converting a unit is multiplying by one. Write the conversion as a fraction equal to unity, arranged so the unit you want to lose cancels, and no power of ten can slip. Dimensional analysis is the same idea applied to a whole formula, which also lets you check an equation before you trust it.
- Class 11 · Chapter notes
Basic Maths for Physics
Physics quietly assumes a set of maths that is never taught inside a physics chapter. Derivatives give you velocity and acceleration from position, integrals give you displacement and work back, vectors handle direction, and two approximations, small-angle and binomial, turn otherwise impossible expressions into ones you can evaluate.
Read it, then play it.
In the app every one of these chapters becomes a game you play, a short read, then practice that tests you at every step. A full chapter, understood, in 45 to 60 minutes. Free to start.