Chapter 4 of Class 11 Physics extends 1D motion to 2D. Motion in a plane requires vectors and covers key topics like projectile motion and uniform circular motion.
In projectile motion, horizontal velocity remains constant (no air resistance), while vertical velocity changes due to gravity. These two components are completely independent.
Vector Addition — Triangle Law: If two vectors are placed head to tail, the resultant is the vector from the tail of the first to the head of the second.
When an object is thrown at an angle and moves under gravity alone — that is projectile motion.
Key formulas (initial velocity u at angle θ):
Motion in a circle with constant speed.
The horizontal range is maximum at **θ = 45°**. At this angle, sin2θ = sin90° = 1, giving R = u²/g (maximum possible range).
One Coulomb is Equal to What?
Learn the exact definition of 1 Coulomb — the SI unit of electric charge. Understand its relationship with Ampere and the charge of an electron.
What is One Horsepower and One Unit of Electricity?
Learn the exact values of common power units. Find out what 1 Horsepower (HP) is equal to in Watts, and what 1 Unit of Electricity means on your home bill.
Planck's Constant — Value and Dimensional Formula
Learn the dimensional formula of Planck's Constant (h). Step-by-step derivation using the energy of a photon equation (E = hν).
What is Planck's Quantum Theory?
Understand Max Planck's Quantum Theory of radiation. Learn how energy travels in small, discrete packets called 'Quanta' or 'Photons' rather than a continuous wave.
Point Charge — Definition, Electric Field and Potential
A point charge is an idealized model where all charge is concentrated at a single point. Learn Coulomb's law, electric field (E=kq/r²), and electric potential (V=kq/r) for Class 12 Physics.
Turn this guide into revision flashcards, a practice exam, or an AI-generated podcast — free, no signup required.