Physics Reference
Physics Formulas & Laws Cheat Sheet
Essential equations for Mechanics, Work & Energy, Waves, Optics, and Electricity.
1. Kinematics & Laws of Motion
First Equation of Motionv = u + at
Second Equation of Motions = ut + Β½atΒ²
Third Equation of MotionvΒ² = uΒ² + 2as
Newton's Second LawF = ma
Linear Momentump = mv
Universal GravitationF = G(mβmβ)/rΒ²
2. Work, Energy & Power
Work DoneW = F Β· d Β· cosΞΈ
Kinetic EnergyKE = Β½mvΒ²
Gravitational Potential EnergyPE = mgh
Mechanical PowerP = W / t = F Β· v
Mass-Energy EquivalenceE = mcΒ²
PressureP = F / A
3. Electricity & Magnetism
Ohm's LawV = IR
Electric ChargeQ = It
Electrical PowerP = VI = IΒ²R = VΒ²/R
Resistors in SeriesR_eq = Rβ + Rβ + ...
Resistors in Parallel1/R_eq = 1/Rβ + 1/Rβ
Joule's Heating LawH = IΒ²Rt
4. Waves & Optics
Wave Speed Equationv = fΞ»
Mirror Formula1/f = 1/v + 1/u
Thin Lens Formula1/f = 1/v - 1/u
Lens Power (Dioptres)P = 1 / f(m)
Snell's Lawnβ sinΞΈβ = nβ sinΞΈβ
Refractive Indexn = c / v
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