Physics Class 11 is an important subject for students who want to pursue a career in engineering or science. It covers a wide range of topics such as motion, energy, thermodynamics, waves, optics, and electromagnetism. To help students with their studies, here are some important formulas from each chapter that they should keep in mind.

Chapter 1: Physical World

- Kinematic equations: v = u + at, s = ut + 1/2 at^2, v^2 = u^2 + 2as
- Newton's laws of motion: F = ma, F = Gm1m2/r^2, F = -kx
- Work-energy theorem: W = Fd, W = ΔK, ΔE = Q - W

Chapter 2: Units and Measurements

- SI units: meter (m), kilogram (kg), second (s), ampere (A), kelvin (K), mole (mol), candela (cd)
- Dimensional analysis: [M], [L], [T], [Q]

Chapter 3: Motion in a Straight Line

- Average velocity: v = (s2 - s1)/(t2 - t1)
- Instantaneous velocity: v = lim Δt → 0 (Δs/Δt)
- Acceleration: a = (v2 - v1)/(t2 - t1)

Chapter 4: Motion in a Plane

- Projectile motion: range = u^2 sin 2θ/g, maximum height = u^2 sin^2 θ/2g
- Circular motion: v = ωr, a = v^2/r, F = ma = mv^2/r

Chapter 5: Laws of Motion

- Inertia: F = ma, F = -kx, F = Gm1m2/r^2
- Conservation of momentum: p = mv, Δp = FΔt, Δp = 0 (for a closed system)

Chapter 6: Work, Energy and Power

- Work done: W = Fd cos θ, W = ΔK, W = ΔE
- Potential energy: U = mgh, U = 1/2 kx^2
- Power: P = ΔW/Δt, P = Fv

Chapter 7: System of Particles and Rotational Motion

- Moment of inertia: I = Σmr^2, I = kmr^2
- Angular momentum: L = Iω, ΔL/Δt = τ, τ = Fr sin θ
- Torque: τ = Fr sin θ, τ = Iα

Chapter 8: Gravitation

- Law of gravitation: F = Gm1m2/r^2
- Gravitational potential energy: U = -Gm1m2/r
- Escape velocity: v = √(2GM/r)

Chapter 9: Mechanical Properties of Solids

- Stress: σ = F/A, σ = Yε
- Strain: ε = ΔL/L, ε = σ/Y
- Young's modulus: Y = stress/strain

Chapter 10: Mechanical Properties of Fluids

- Pascal's law: P = F/A
- Archimedes' principle: Fb = ρVg
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