Trisha Lal 2011 Preliminary Physics

PHYSICS FORMULAEFormula in wordsFormula in SymbolsUnits

Frequency = 1/PeriodFrequency = hertz (Hz)Period = seconds (s)

Velocity = frequency x wavelengthVelocity = Wavelength = m

Intensity = 1/distance ^ 2Intensity = Distance = m

Snells Law = velocity 1/ velocity 2 = sin incidence / sin reflection = refractive I 1 / refractive I 2 / wavelength 1 / wavelength 2Incidence and Reflection = degrees

Electric Field = Force / chargeE=newton per coulomb ()F = Force (N)q = Charge coulombs C

Current = Charge / TimeCurrent = C/sec (amperes) (A)

Voltage = work (change in potential energy) / chargeVoltage = volts (V)Work = joules (J)

Voltage = Current x ResistanceV = IRResistance = ohms ()

Voltage in Series = Total = Voltage 1 + Voltage 2

Current in Parallel = Total = Current 1 + Current 2

Power = Energy / TimePower = Watt (W) = joules/sec

Power = Voltage x Current

Energy = Voltage x Current x timeE = VItEnergy = joules (J)

Average Speed = Distance / TimeSpeed = m/s

Average Velocity = total displacement / total timeDisplacement = m

Adding Vectors = PythagorasAll in metres

Subtracting Vectors = Final Initial = Change VT = Vi V2When one line is in neg y axis

Weight = mass x gravityW = mgWeight = NMass = kgGravity =

Acceleration = final velocity / timeAcceleration =

Centripetal Force = massxvelocity^2 / radiusRadius = m

Force = mass x accelerationF = ma

Kinetic Energy = 0.5 x mass x velocity^2Energy = J = joules

Work = Force x distanceW = FsW = change in kinetic energy=J

Momentum = mass x velocityp = mvMomentum =

Impulse = Force x TimeImpulse = Impulse = kg.m/s

Energy = mass x speed of light^2C = constant = speed of light

Good Luck!