Physics > Common Equations
Listed below are the most commonly used equations in physics. They are divided into sections for ease of use.
Energy

Equation 
Written Equation 
Gravitational
potential energy 
GPE = mgh 
Gravitational Potential Energy =
mass x gravity x height 
Work Done 
W = E 
Work Done = Energy transferred 
Efficiency 
 
Efficiency (%) =
(useful energy out / total energy in) x 100 
Kinetic Energy 
KE = ½mv^{2} 
Kinetic Energy = 0.5 x mass x velocity^{2} 
Power 
P = E / t 
Power = Energy / time 
Work Done 
W = F x s 
Work Done = Force x distance moved
in direction of force 
Forces and Motion

Equation 
Written Equation 
Speed 
s = d / t 
Speed = distance / time 
Weight 
w = m x g 
Weight = mass x gravitational field strangth
(also written as w=mg) 
Density 
d = m / v 
Density = mass / volume 
Force 
F = m x a 
Force = mass x acceleration
(also written as F=ma) 
Acceleration 
a = (vu) / t 
Accelration = change in velocity / time 
Moment 
m = F x d 
Moment = Force x perpendicular distance from pivot (also written as m=Fd) 
Pressure 
p = F / a 
Pressure = Force / area 
Waves

Equation 
Written Equation 
Velocity 
v = f x λ 
Velocity = frequency x wavelength
(also written as v=fλ).
'λ' is Lambda, the symbol for wavelength
