# Physics equations

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

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- Created by: CoolKid
- Created on: 04-04-13 09:31

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- 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

- moment = F x d
- 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

- PE = m x g x h
- 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)

- Q = I x T
- 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

- n = sin i / sin r
- 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)

- P = h x ? x g

- Forces and motion

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