9th Class Physics – Important Questions & Chapter-wise Notes (Sahiwal Board, Pakistan)

9th Class Physics – Important Questions / Notes (Sahiwal Board, Pakistan)




Chapter 1: Physical Quantities & Measurements
• Fundamental Quantities: Length, Mass, Time, Temperature, Electric Current
• SI Units: meter, kg, second, Kelvin, Ampere
• Derived Quantities: Area, Volume, Density, Speed, Acceleration
• Formulas: Density = Mass / Volume; Speed = Distance / Time


Chapter 2: Motion
• Types: Uniform, Non-uniform, Circular
• Speed = Distance / Time; Velocity = Displacement / Time
• Acceleration: a = (v - u)/t
• Equations of Motion: v = u + at; s = ut + 1/2 at^2; v^2 = u^2 + 2as


Chapter 3: Force and Laws of Motion
• Newton's Laws of Motion 1,2,3
• Weight: W = mg
• Friction: Ff = μN
• Concepts: Mass vs Weight, Free fall, Terminal velocity


Chapter 4: Work, Energy, and Power
• Work: W = F × d × cosθ
• Kinetic Energy: KE = 1/2 mv^2; Potential Energy: PE = mgh
• Power: P = W / t
• Law of Conservation of Energy


Chapter 5: Heat & Thermodynamics
• Temperature vs Heat: T = hotness; Q = energy transfer
• Specific Heat: Q = mcΔT
• Latent Heat: L = Q/m
• Laws of Thermodynamics


Chapter 6: Waves and Sound
• Types: Mechanical, Electromagnetic
• Properties: Frequency, Wavelength, Amplitude, Speed




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