Mcat Physics Formulas

Physics

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 = 2pÖ(l/g) r = m/V
Upward force on a body = weight of fluid displaced by that body Hydrostatic pressure = rgh
r1A1v1 = r2A2v2 P1 + rgh1 + ½rv1
2 = P2 + rgh2 + ½rv2
2
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/I0)
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 Resistivity = RA/l
For resistors in series, RT = R1 + R2 + R3 + … For resistors in parallel, 1/RT = 1/R1 + 1/R2 + 1/R3 + …
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 Lens power = 1/f, where f is the focal length in m. Lens power is measured in diopters.
1/f = 1/u + 1/v Two lenses in contact: 1/F = 1/f1 + 1/f2 E = hf
At = Aoe-kt t½ = ln2/k