# Physics Formulae

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• Created by: Elle
• Created on: 13-03-13 10:01

## Electrical Power

Electrical Power = current x voltage

P = I x V

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## Voltage

Voltage = current x resistance

V = I x R

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## Charge

Charge = current x resistance

Q = I x T

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## Average Speed

Average Speed = distance moved / time taken

s = d/t

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## Force

Force = mass x acceleration

f = m x a

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## Pressure

Pressure = force/area

P = f/a

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## Moment

Moment = force x perpendicular distance from pivot

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## Wave Speed

Wave Speed = frequency x wavelength

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## Refractive Index

Refractive Index = sin(i) / sin(r)

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## Critical Angle

sin(critical angle) = 1/refractive index

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## Energy Transfer

Energy Transfer = work done

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## Work Done

Work Done = force x distance moved in direction of force

W = F x D

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## Efficiency

Efficiency = useful energy output/total energy input

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## Efficiency

Efficiency = useful energy output/total energy input

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## Density

Density = mass/volume

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## Gravitational Potential Energy (GPE)

Gravitational Potential Energy = mass x g x height

GPE = m x g x h

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## Kinetic Energy

Kinetic Energy = 1/2 x mass x speed(squared)

KE = 1/2 x m x v(squared)

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