GCSE Physics Key Equations

Question	Answer
density = mass / volume	ρ = m/v
pressure = force / area	P = F/A
Pressure = density x gravity x height	P = pgh
Boyles Law	P1 V1 = P2 V2
The Pressure Law	P1/T1 = P2/T2
Voltage = Current x Resistance	V = IR
Charge = Current x time	Q = IT
Power = Current x Voltage	P = IV
Energy = Current x time x Voltage	E = ItV
wave speed = frequency x wavelength	v = fλ
frequency = 1/Time Period	f = 1/T
Efficiency =	useful energy output / total energy input
refractive index = sine (angle of incidence) / sine (angle of refraction)	n = sin(i) / sin(r)
refractive index = 1 / sine (critical angle)	n = 1 / sin (c)
Work Done = Force x displacement	W = Fd
Gravitational Potential Energy = mass x gravity x height	GPE = mgh
Kinetic Energy = 1/2 (mass x speed^2)	KE = 1/2(mv^2)
Power = Work Done / time	P = W/t
GPE gained = KE lost	GPE lost = KE gained
average speed = distance moved / time taken	s = d/t
acceleration = (change in velocity) / time taken	a = (v - u)/t
Force = mass x gravity	F = mg
Weight = mass x gravity	W = mg
Moment =	Force x perpendicular distance from the pivot

Resource summary

	Created by Nick Stoner over 7 years ago