# Physics Formulae

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• Created by: hibawot
• Created on: 14-05-14 15:34

## Forces and Motion

• Speed (m/s) = Distance ÷ Time

• Acceleration (m/s ) = Change in Speed ÷ Time

• Weight (N) = Mass (kg) x Gravity

w = mg

• Force = Mass x Acceleration

F = ma

• Moment (Nm) = Force (N) x Distance to Pivot (m)

• Orbital Speed = 2 x π x Orbital Radius ÷ Time

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## Electricity

• Electrical Power (in Watts) = Current x Voltage

P = IV

• Energy Transferred (in Joules) = Current x Voltage x Time

E = IVt

• Voltage = Current x Resistance (Ohms)

V = IR

• Charge (in Coulumbs) = Current x Time

Q = IT

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## Waves

• Speed (m/s) = Frequency (in Hz) x Wavelength (m)

v = f x λ

• Sin C = 1 ÷ Refractive Index

sin C = 1 ÷ n

• Refractive Index = Sin Incident Ray ÷ Sin Refracted ray

n = sin i ÷ sin r

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## Energy Transfer

• Efficiency = Useful Output ÷ Total Energy Input

• Work Done (in Joules) = Force x Distance

W = Fd

• Power (in Watts or Joules/s) = Work done ÷ Time taken

W = Pt

• GPE = Distance x G x Height

GPE = mgh

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## Solids, Liquids & Gases

• Density (in kg/m cubed = Mass ÷ Volume

m = pV

• Pressure (in Pascals or N/m squared) = Force ÷ Area

F = pA

• Pressure Difference (in Pascals) = Height x Density x G

p = hpg

• p1 V1 = p2 V2

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## Magnetism - Fleming's Left Hand Rule

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Alpha Emission:

• Mass number - 4
• Atomic number - 2

Beta Emission:

• Mass number doesnt change
• Atomic number + 1

Gamma Emission: No change, just waves of energy

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