Fluid Mechanics Notes Class 11 FBISE NBF: Complete solved chapter for Class 11 Physics FBISE new syllabus. Covers upthrust, Archimedes principle, fluid statics/dynamics, MCQs, short/comprehensive questions, numericals, assignments from Hamdard Science Academy PDF.
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Fluid Mechanics
Branch studying fluids (liquids/gases) at rest (statics) and motion (dynamics). Crucial for engineering, medicine.
Upthrust and Archimedes Principle
Definition: Upthrust (buoyant force) upward force by fluid opposing object weight. Archimedes: equals weight of displaced fluid.
Explanation: Pressure increases with depth; net upward force from pressure difference.
Derivation: For cylinder area A, height h in fluid density ρ_f: F_B = ρ_f g A h = ρ_f g V (weight displaced fluid).
Examples: Floating wood (upthrust = weight); sinking stone (weight > upthrust).
Exercises Solved
Solved MCQs
- Principle of floatation finds: A. Density
- Upthrust equals: A. Weight displaced liquid
- Sphere in Stokes law: B. Constant velocity
- Two drops form one, terminal velocity: C. 32 cm/s
Short Responses
6.1 Athletes wear body suits: Reduce drag; streamlined shape minimizes turbulence.
6.2 Turbulent vs streamline: Streamline smooth layers; turbulent chaotic.
6.3 River width change: Continuity; wider slower, narrower faster.
Long Responses
6.1 Upthrust: Upward force = weight displaced. Examples: Wood floats, stone sinks.
6.2 Principle floatation: For floating, weight = upthrust. Derivation, applications.
Numericals
6.1 Fog droplet vt=2.98 mm/s, η=1.9e-5 kg/m·s: r=5.1e-6 m
Solution: vt = [2(ρ_obj – ρ_fl) r² g] / 9η
Assignments
Assignment 6.1 Iron density 7.8 g/cm³, 200 N lighter water: (a) V=0.0255 m³ (b) Weight air=1950 N
Master fluid mechanics chapter notes FBISE with NBF physics unit 6 solved.
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