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Saturday 26 June 2021

Physics Formulas For Class IX and X - By Sir Sajjad Akber Chandio

Physics Formulas

Chapter Measurement

  • V = l x b x h (To find volume)
  • 4πr2 (To find Surface area)
Units
  • v = volume m3
  • l = length m
  • b = breadth m
  • h = height m
  • π = 3.14 (constant)

Chapter Kinematics Of Linear Motion

  • vf = vi + at (Final velocity maloom karni ho)
  • S = vit + 1/2 at2
  • 2as = vf2 - vi2
  • V = S/t (To find speed)
  • Vav = (vf + vi) / 2 (To find average velocity)
  • vf = vi + gt (Final velocity maloom karni ho)
  • h = vit + 1/2 gt2 (h = height, g = 9.8 m / s2 )
  • h = vf2 - vi2
  • 2gh = vf2 - vi2

Chapter Motion And Force

  • F = ma (To Find force)
  • a = F/m (To Find acceleration)
  • W = mg (To Find weight)

  • S = vit + 1/2 at2
  • vf = vi + at
  • 2as = vf2 - vi2
Units
F = N
m = kg
a = m/s2
W = N
g = 10 m/s or If value of g is not given than it is 9.8m/s


  • P = mv (To Find momentum)
  • a = (vf - vi) / t (To Find acceleration)

Chapter Vector

Components of vectors
  • Fx = F cosθ (Horizontal)
  • Fy = F sinθ (Vertical)

Chapter Equilibrium

  • T = F x d (Torque maloom karna ho jab diatance mojood ho)
  • T = F x r (Torque maloom karna ho jab radius mojood ho)
  • T/d = F (Force maloom karna ho aur torque mojood ho)
Units:
  • T = N . m
  • F = N
  • d = moment of arm = m

Chapter Circular motion

  • Fc = mv/ r (Centripetal force maloom karna ho)
  • Tc = mv2 / r (Tension maloom karna ho)
  • ac = v/ r (Centripetal acceleration maloom karna ho)
  • F = Gm1m/ R2 (Jab force maloom karni ho aur 2 masses mojood ho)
Units
  • Fc = Centripetal force N
  • m = mass kg
  • v = Velocity m/s
  • r = Radius m
  • F = Force N
  • G = constant (6.67 x 10-11 Nm2/kg2)
  • ac = Centripetal acceleration m/s2

Chapter Work, Power And Energy

  • W = F.S cos θ (Jab work maloom karna ho aur angle mojood ho)
  • W = F.S (Jab work maloom karna ho aur angle mojood na ho)
  • P = Fv (Jab Power maloom karni ho aur velocity mojood ho)
  • K.E = 1/2 mv2 (Jab K.E maloom karna ho aur velocity mojood ho)
  • K.E = 1/2 m(vf - vi)2 (Jab KE maloom karna ho aur velocity mojood ho)
  • P = W/t (Jab Power maloom karni ho aur Time mojood ho)
  • P.E = mgh (Jab P.E maloom karni ho aur height mojood ho)

  • S = vit + 1/2 at2
  • 2as = vf2 - vi2

  • F= ma

Units:
  • W = J
  • F = N
  • S = m
  • P = watt
  • t = sec
  • K.E = J
  • P.E = J
  • m = kg
  • g = m /s2

Chapter Heat

  • K = °C + 273 (To find Kelvin)
  • °C = 5/9 (°F - 32) (To find Celcius)
  • °F = 9/5 °C + 32 (To find Farenheit)
  • PV = nRT (jab 1 mole ka zikr ho tou yeh formula use kare gy aur Temperature ko Kelvin main change kare gy)
  • ∆Q = mC∆T (Amount of heat maloom karni ho aur specific heat mojood ho)
  • C = ∆Q m.∆T (Specific heat maloom karni ho)
  • ∆L = αL∆T (jab Thermal expansion aur Linear expansion ka zikr ho)
Units
  • P = Pressure N/m2
  • V = Volume cm3
  • n = No. of moles (no unit)
  • R = Constant 8.31 J/mol °C
  • T = temperature K
  • C = Specific heat J/kg °C
  • m = mass kg
  • Q = Amount of heat J
  • K = Constant
  • L = Length m
  • α = linear thermal expansion k-1
  • A = area m2

Chapter Wave And Sound


Chapter reflection And Refraction Of Light



Chapter Electricity

  • V= IR
  • V/I = R
  • V/R = I
  • I = V/t
  • I = q/t
Units
  • V = Voltage (volt)
  • I = Current (Ampere)
  • R = resistance (Ω)

Chapter Nuclear Energy

  • E = mc2 (To find energy)
Units
  • c = constant= 3 x 108 m/s
  • m = kg
  • E = Energy = Joule

  • P = F/A (To find pressure)


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