Physics O Levels Formulas

Formula for speed

distance/time=speed

Formula for density

density = mass/volume

Formula to calculate thermal energy supplied, for a substance melting

Q = mlf

How is pressure and volume related for a gas?

pV = constant

Formula to calculate critical angle

n = 1/sinc

Formula to calculate thermal energy supplied, if there is a temperature change

Q = mc (∆θ)

Formula for frequency of a wave

f = 1/T

Formula for kinetic energy

KE = ½mv²

Formula for power (for mechanics)

P = WD/t

Formula for moment

moment = force x perpendicular distance

Formula for weight

W = mg

formula for acceleration

a = (v-u)/t

3 formulas for refractive index

n = sin(i)/sin(r) OR n = c/v or n = 1/sin(c)

Formula for wave speed

v = fλ

Formula for work done

W = F x d

Formula for GPE (gravitational potential energy)

GPE = mgh

Formula for resultant force

F = ma

How is pressure at the 2 pistons related for a hydraulic press?

F₁/A₁ = F₂/A₂

Formula for pressure

P = F/A

Formula relating power transmitted for an ideal transformer

IpVp = IsVs

Formula for electrical energy consumption

E = Pt

Formula for resistors in parallel

Rtotal = (1/R₁ + 1/R₂ + ....)⁻¹

Formula relating current, voltage and resistance

V = IR

Formula to calculate charge in a circuit

Q = It

Formula for pressure (in general)

P = F/A

Formula for pressure (in liquids)

P = hpg

Formula to calculate power loss in transmission lines

P = I²R

Formula relating turns ratio and voltage for a transformer

Np/Ns = Vp/Vs

Formula for electrical power

P = IV

Formula for resistors in series

Rtotal = R₁ + R₂ + ...

Formula for potential difference or e.m.f.

V = W/Q

Formula for calculating distance based on echo

2d = s x t