Physics Formulas

Mechanics

Density

ρ=mV\rho = \dfrac{m}{V}

Weight

W=mgW = mg

Moment of a Force

Moment=F×d\text{Moment} = F \times d

Hooke's Law

F=keF = ke

Pressure

P=FAP = \dfrac{F}{A}

Pressure in Fluids

ΔP=hρg\Delta P = h\rho g

Acceleration

a=vuta = \dfrac{v - u}{t}

Newton's Second Law

F=maF = ma

Momentum

p=mvp = mv

Impulse

Impulse=Ft=Δ(mv)\text{Impulse} = Ft = \Delta(mv)

Work Done

W=FdW = Fd

Kinetic Energy

Ek=12mv2E_k = \dfrac{1}{2}mv^2

Gravitational PE

Ep=mghE_p = mgh

Power

P=EtP = \dfrac{E}{t}

Efficiency

Efficiency=useful outputtotal input×100%\text{Efficiency} = \dfrac{\text{useful output}}{\text{total input}} \times 100\%

Speed

v=dtv = \dfrac{d}{t}

Thermal

Heat Capacity

EH=CΔθE_H = C\Delta\theta

Specific Heat Capacity

EH=mcΔθE_H = mc\Delta\theta

Specific Latent Heat of Fusion

E=mLfE = m L_f

Specific Latent Heat of Vaporisation

E=mLvE = m L_v

Boyle's Law

P1V1=P2V2P_1 V_1 = P_2 V_2

Charles' Law

V1T1=V2T2\dfrac{V_1}{T_1} = \dfrac{V_2}{T_2}

Pressure Law

P1T1=P2T2\dfrac{P_1}{T_1} = \dfrac{P_2}{T_2}

Combined Gas Law

P1V1T1=P2V2T2\dfrac{P_1 V_1}{T_1} = \dfrac{P_2 V_2}{T_2}

Kelvin Temperature

T=θ+273T = \theta + 273

Waves

Wave Equation

v=fλv = f\lambda

Period & Frequency

T=1fT = \dfrac{1}{f}

Snell's Law

n=sinisinrn = \dfrac{\sin i}{\sin r}

Snell's Law (speed form)

n=v1v2n = \dfrac{v_1}{v_2}

Critical Angle

sinc=1n\sin c = \dfrac{1}{n}

Magnification

M=vu=image heightobject heightM = \dfrac{v}{u} = \dfrac{\text{image height}}{\text{object height}}

Lens Formula

1f=1u+1v\dfrac{1}{f} = \dfrac{1}{u} + \dfrac{1}{v}

Electricity

Charge

Q=ItQ = It

Voltage Definition

V=EQV = \dfrac{E}{Q}

Ohm's Law

V=IRV = IR

Resistance

R=VIR = \dfrac{V}{I}

Electrical Power

P=IVP = IV

Electrical Energy

E=QVE = QV

Resistance (Series)

RT=R1+R2+R3+R_T = R_1 + R_2 + R_3 + \ldots

Resistance (Parallel)

1RT=1R1+1R2+\dfrac{1}{R_T} = \dfrac{1}{R_1} + \dfrac{1}{R_2} + \ldots

Transformer Equation

VsVp=NsNp=IpIs\dfrac{V_s}{V_p} = \dfrac{N_s}{N_p} = \dfrac{I_p}{I_s}

AC Frequency

f=1Tf = \dfrac{1}{T}

Atomic

Mass Number

A=Z+NA = Z + N

Mass-Energy Equivalence

E=mc2E = mc^2