# Physics equations

All the equations you need to know for iGCSE double award physics. You have to memorise them all.

• Created by: CoolKid
• Created on: 04-04-13 09:31
• Physics Equations
• Forces and motion
• moment = F x d
• Force x distance
• S = d / t
• Speed = distance / time
• W = m x g
• Weight = mass x gravity
• F = m x a
• Force = mass x acceleration
• orbital speed = ( 2?r ) / period of orbit
• Energy
• PE = m x g x h
• Potential energy (J) = mass x gravity x height
• KE = 0.5mv(2)
• Kinetic energy = 0.5 mass x velocity (squared)
• Efficiency = useful work / total energy
• Power = work / time
• power in watts (W)
• Work = F x d
• Force x distance. Work in Watts, force Newtons, distance metres
• Electricity
• Q = I x T
• coulomb (C), current x time
• E = I x T x V
• Energy Joules.
• P = I x V
• power in Watts
• V = I x R
• Volts = current (amps) x resistance (ohms)
• Waves
• n = sin i / sin r
• Refractive index = incident angle / refracted angle
• F = 1 / period
• period time of one wave
• sin c = 1 / n
• critical angle, n refractive index
• Solids, liquids and gases
• P = h x ? x g
• Pressure (N/m (2)) = height, density, gravity
• P = F / A
• A area
• ? = m / v
• ? density, kg/m (2)

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