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Stokes' Law and Terminal Velocity Class 11 Physics Notes | Derivation, Formula, MCQ, Questions Answers for JEE, NEET chapter 9 Mechanical Properties of Fluids - Physicskund Introduction When a body moves through a viscous fluid, it drags the fluid layers in contact with it. The fluid layers farther away remain almost undisturbed. As a result, relative motion is produced between different layers of the fluid. Due to this relative motion, a backward dragging force acts on the body and opposes its motion. This force is called viscous force or drag force . The magnitude of this force increases with the velocity of the body. Stokes' Law Statement According to Stokes, The viscous drag force acting on a small spherical body moving through a viscous fluid is directly proportional to the coefficient of viscosity of the fluid, radius of the sphere and velocity of the sphere. Mathematical Form $$F \propto \eta$$ $$F \propto r$$ $$F \propto v$$ Combining, ...

Complete notes on Angle of Contact with Young's Equation, wetting, non-wetting, applications, MCQs, FAQs, numericals and exam questions for Class 11 Physics chapter 9 Mechanical Properties of Fluids - Physicskund  Angle of Contact The free surface of a liquid near the plane of contact with another medium is generally curved. The angle between the tangent drawn to the liquid surface at the point of contact and the solid surface, measured inside the liquid, is called the Angle of Contact . Symbol: θ Definition of Angle of Contact Angle of contact is the angle between the tangent to the liquid surface at the point of contact and the solid surface, measured inside the liquid. Interfacial Tensions At the line of contact between solid, liquid and air, three interfacial tensions act: S la = Surface tension of liquid-air interface S sa = Surface tension of solid-air interface S sl = Surface tension of solid-liquid interface Young's Equation For mechanical equi...

Learn Capillary Rise with complete derivation, formula, factors affecting rise, capillary depression, numericals, MCQs and NCERT Class 11 Physics notes chapter 9 Mechanical Properties of Fluids - Physicskund  Capillary Rise One consequence of the pressure difference across a curved liquid-air interface is the phenomenon of capillary rise. When a narrow tube is dipped vertically into water, the water rises inside the tube against gravity. This phenomenon is called capillary rise . Definition of Capillary Rise Capillary rise is the phenomenon in which a liquid rises in a narrow tube due to the pressure difference created by surface tension at the curved liquid surface. Capillary Tube A capillary tube is a very narrow tube of small radius. Water rises inside the tube. The liquid surface becomes curved. A pressure difference develops across the curved surface. The liquid rises until equilibrium is established. Meniscus The curved surface of a liquid in contact ...