PHYSICS FORMULAS (NEET/JEE) 2022

PHYSICS FORMULAS

1. FORCE

  • F = ma
  • F = kx
  • F = m(vf² – vi²/2S)
  • F = mv/t
  • F = md/t²
  • F = m(vf – vi) /t
  • F = Area × density × velocity²
  • F = 1/2 mv²/d
  • F = 1/2 Pv/d
  • F = Power/velocity
  • Fc = mv²/r
  • Fc = mrw²
  • Fc/2 = mv²/2r
  • Fc = 2K.E/r
  • F = Area × Stress
  • F = pir² × stress
  • F = YA × Strain
  • F = YAl/L
  • F = pressure × area
  • F = change in momentum × time interval
  • F = – 2mVx × Vx/2l
  • F2 = F1/A1 × A2
  • F = qE
  • F = kQ/r²
  • F = ILB sintheta
  • F = q (v × B)
  • F = qE + q(v × B)

2. Formulas related to energy and work

  • Fd = k.e
  • mgh = 1/2 mv²
  • E = 1/2 kx²
  • E = Ve
  • E = nhf
  • E = nhc/lambda
  • E = Pc
  • K.e = hf – work function = hf – hf° = hf – hc/w° (here w° is cutt off wavelength)
  • E = 1/2 Pv
  • mv²/2r= Fc/2
  • K.E/r = Fc/2
  • K.E = Fc×r/2
  • K.e = 1.5 KT
  • E = VQ
  • E = Power × time
  • E = Fvt
  • % loss in K.e = v1² – v2²/v1² × 100
  • % loss in P.e = h1² – h²/h1² × 100
  • Energy lost due to air friction(Fh) = 1/2mv² – mgh (when body is thrown upward)
  • Energy lost due to air friction(FS) = mgh – 1/2mv² (when body is thrown downward)
  • E = 1/2 CV² (capacitor)
  • E = R × hc (R is Rydberg’ constant)
  • J = m-¹ × Js ms-¹
  • hf kalpha x rays = EL – Ek
  • hf kbeta x rays = EM – Ek
  • Binding energy = mass defect × c²
  • W = Fd Costheta
  • W = nmgh (when person is climbing stairs)
  • W = n(m+m) gh (when person is climbing stairs with some load)
  • W = 0mgh + 1mgh + 2mgh + 3mgh ……. (in case of stacking bricks. For ist brick h=0. For 2nd brick h=1. For 3rd brick h=2 and so on)
  • W = Fd = PA × change in V
  • W = Q – change in U
  • Q = mc × change in T
  • T/273.16 = Q/Q3 (Thermodynamic scale)
  • W = I²Rt
  • W = emf×charge
  • W = VQ
  • W = 1/2 lF
  • W = YAl²/2L
  • W = StressAl²/2Strain
  • W = PressureAl²/2Strain
  • W = Fl²/2Strain

3. Formulas related to Power

  • P = Fv
  • P = E/t
  • P = n(mgh/t)
  • P = Fd/t
  • P = mv²/2t

4. Formulas related to distance, displacement, velocity and acceleration

  • d = vt
  • d = at²
  • d = (vf + vi/2) ×t
  • d = 5t² (for distance in ‘n’ seconds)
  • d = 5(2tn – 1) (for distance in ‘nth’ second)
  • d = 1/2 mv²/F
  • d = vit + 5t²
  • d = v × underroot 2H/g
  • d = vt = x°wt = x°2pi/T × t = x°2pift
  • x = x° Sin wt
  • x = x° Sin (underroot k/m) t
  • vf = vi + at
  • 2as = vf² – vi²
  • 2as = (vi + at)² – vi²
  • 2as = vf² – (vf – at) ²
  • v = underroot Vfx² + Vfy²
  • v = Power/Force
  • v = 2×K.E/momentum (k.e = 1/2 Pv)
  • v² = 2×Power×time/mass (P = mv²/2t)
  • v = underroot 2as
  • v = underroot gr (speed at highest point in a verticle circle)
  • v = underroot 5gr (speed at lowest point in a verticle circle)
  • v² = 2FS/m
  • v² = 2E/m
  • v² = 2Ve/m
  • v = eBr/m (velocity of particle under action of magnetic force along circular path)
  • v² = Force/Area.Density
  • v = w underroot x°² – x²
  • v = underroot k/m × underroot x°² – x²
  • v = x°w (at mean position where x=0)
  • v = x° underoot k/m
  • v = v° underroot 1 – x²/x°² (for determining ratio b/w inst. Velocity and maxi. Velocity)
  • v= x°2pif = x°2pi/T
  • a = x°w² = x°w.w = vw = v.2pif
  • Common velocity = m1v1/m1+m2
  • vi² = Rg/Sin2theta
  • v = underoot Tension×length/mass
  • V = 2pi ke²/nh (speed of e- in nth orbit)
  • Vn = V/n
  • v = nh/2pimr (lambda = 2pir and lambda=h/p)
  • ma = kx
  • a = kx/m (SHM)
  • a = – gx/l (Simple pendulum)
  • ac = v²/r

5. Formulas related to wavelength ‘w’

  • w = v/f
  • w = 1/wave number
  • w1 = 2l (when pipe is opened at both ends)
  • w1 = 4l (when pipe is opened at one end)
  • Delta w = Us/f (doppler shift)
  • Wavelength for obs. = w – delta w = v/f – Us/f
  • w = hc/Ve
  • w = hc/E
  • w = h/mv
  • w = h/P as P = underroot 2mE so
  • w = h/underroot 2mE (de Broglie wavelength)
  • w = underroot 150/V A° (short method for de Broglie wavelength. This formula is applicable only for e-)
  • 1/w = RH (1/p²-1/n²)
  • Wmaxi/Wmini = n²/n²-p² (for determining ratio b/w maxi. Wavelength to mini. Wavelength for series of atomic spectrum)
  • w = 2pir/n (n is no. of loops in a circle)
  • h/mv = 2pir

 

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