# Physics Formulae

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Speed
Speed = Distance/Time
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Weight
w = m X g
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Acceleration
Acceleration = Change in velocity/Time taken
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Momentum
Mass X Velocity
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Density
Density = Mass/Volume
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Force
F = m X a
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Extention
Extention = Constant X Load or x = k X F
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Work Done
Work Done = Force X Distance
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Gravitational Potential Energy
GPE = m X g X h
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Kinetic Energy
K.E. = 1/2 X m X v2
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Efficiency
Efficiency = (Useful energy output/Total energy input) X 100%
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Power
Power = Work done/Time taken
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Wave Speed
Wave Speed = Frequency X Wavelength
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Angle of Incidence
Angle of Incidence = Angle of Reflection or i = r
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Index of Refraction
n = Sin i / Sin r
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Charge
Charge = Current X Time
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Voltage
Voltage = Current X Resistance
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Electrical Power
Electrical Power = Current X Voltage
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Energy Transferred
Energy Transferred = Current X Voltage X Time
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Voltage and Number of Turns (Transformers)
Vp/Vs = Np/Ns
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Voltage and Current (Transformers)
Input Power = Output Power or VpIp = VsIs
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Pressure
Pressure = Force / Area
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Pressure Difference
Pressure Difference = Height X Density X Gravitational field strength or p = h X p X g
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Pressure and Volume
P1V1 = P2V2
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Pressure and Temperature
P1/T1 = P2/T2
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Moment
Moment = Force X Perpendicular distance from pivot
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Weight

w = m X g

Acceleration

Momentum

Density