Thursday, August 1, 2013

Physics Formulas to Memorize For Upcoming Exams!


See Formulas below..............!

Physical QuantityFormula     Remarks
Equations of motion at constant acceleration

Density 
 
Weight W = mgW = weight, N
m = mass, kg
g = gravitational acceleration, m/s2 or N/kg
Force F = maF = force, N
m = mass, kg
a = acceleration, m/s2
Moment of a force about a point


Object in equilibrium with parallel forces acting on it 
 
Work doneW = Fd

W = work done, J
F = force, N
d = displacement, m
Kinetic energyK.E.= 1/2 mv2K = kinetic energy, J
m = mass, kg
v = velocity, m/s
Potential energyP.E. = mghEp = potential energy, J
m = mass, kg
g = gravitational acceleration, N/kg or m/s2
h = gain/loss in height
Efficiency

 
Power 
P = power, W
W =  work done or energy transferred, J
t = time, s
E = energy transferred/used, J
Q = thermal energy transferred, J
Pressure 
 
Liquid pressure

Boyle's Law

Specific heat capacity 



Specific latent heat of vaporization or fusion

Wave equation

Refractive index
n = refractive index
i = angle in air/vacuum
r = angle in medium
c = speed of light in vacuum, m/s
v = speed of light in medium, m/s
 Critical angle 
Amount of chargeQ = ItQ = charge, C
t = time, s
Ohm's Law V = IRV = potential difference, V
I = current, A
Potential differenceV = W/QV = potential difference, V
W = work done between two points, J
Q = charge, C
emf 
 
Electrical powerP = IV = I2P = power, W
I = current, A
V = potential difference, V (voltage)
Electrical energyE = VIT E = electrical energy, J
Resistancep = resistivity, ohm
l = length of wire, m
A = cross-sectional area of wire, m2
Transformer equations 
   

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