Some Important Physics Formulas for Students

Some Important daily life Physics Formulae for Students
v = u + at
v² = u² + 2as
s = ut + ½at²
F = ma
F = Gm1m2/r2
a = v2/r
Static friction = FN mS
Dynamic friction = FN mD
MA = load/effort = number of supporting ropes in a frictionless pulley system
VR = distance moved by effort / distance moved by load = number of supporting ropes
Efficiency = work out / work in
Moment = F x perpendicular distance to pivot point
Momentum = mv
Smv before collision = Smv after collision
Impulse = Ft
PE = mgh
KE = ½mv2
Work done = Fd
Power = Fd/t
Dl = kF
Y = stress / strain = (F/A) / (Dl/l)
S = stress / strain = (perpendicular F/A) / (Dx/l)
B = stress / strain = DP / (DV/V)
f µ Ö (k/m)
T = 2p Ö (l/g)
r = m/V
Upward force on a body = weight of fluid displaced by that body
Hydrostatic pressure = rgh
r1A1v1 = r2A2v2
P1 + rgh1 + ½rv12 = P2 + rgh2 + ½rv22
Velocity of sound in a fluid, v = Ö (B/r)
v µ Ö (T/mw)
Velocity of sound in a solid = Ö (Y/r)
Velocity of a wave in a taut string = Ö (tension/[mass/length])
dB = 10log10(I/10-12)
Beat frequency = difference between the two frequencies
f' = f(C±Vd / C±Vs)
F = kq1q2/r²
E = F/q
Between two parallel plates, E = V/d
Concerning a point charge, E = kq/r²
V = Fd/q
V = IR
For resistors in series, RT = R1 + R2 + R3 + ...
For resistors in parallel, 1/RT = 1/R1 + 1/R2 + 1/R3 + ...
Resistivity = RA/l
C = q/V = permitivity x A/d
For capacitors in series, 1/CT = 1/C1 + 1/C2 + 1/C3 + ...
For capacitors in parallel, CT = C1 + C2 + C3 + ...
P = IV
If a.c., P = (Imax/Ö2) (Vmax/Ö2) = Imax Vmax/2
n1sin i = n2sin r
1/f = 1/u + 1/v
Lens power = 1/f where f is the focal length in m. Lens power is measured in diopters.
Two lenses in contact: 1/F = 1/f1 + 1/f2
E = hf
At = Aoe-kt
t½ = ln2/k

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