Physics Practicals Class 11

# Coefficient of Viscosity – Terminal velocity

• Teach science experiments in a gamified way
• Boost conceptual clarity and knowledge retention
• Aligned with National Education Policy 2020
• Helpful in getting NAAC accreditation
• CBSE, ICSE, and state boards aligned curricula
• Engaging simulations with easy-to-teach instructions

• During the simulation, you will gain a comprehensive understanding of how the coefficient of viscosity influences the flow of engine oil through a motorcycle engine, empowering you with valuable insights into engine lubrication dynamics.
• Through the simulation, you can explore firsthand how various viscosities of both thin and thick lubricants navigate through an engine, providing you with practical experience.
• The fundamental concept of viscosity, enabling you to grasp the underlying principles governing fluid flow and resistance.
• The significant effects of the coefficient of viscosity, allowing you to appreciate its impact on various engineering applications, including engine efficiency and durability.

• The determination of terminal velocity of glass beads and the principle of the coefficient of viscosity, equipping you with valuable analytical skills applicable to a wide range of scientific and engineering disciplines.

### Simulation Details

Duration – 30 Minutes
Easily Accessible
Languages – Odia & English
Platforms – Android & Windows

Description

Viscosity:
Viscosity is a fluid’s resistance (liquid or gas) to a change in shape or movement of neighbouring portions relative to one another.

Coefficient of viscosity: The coefficient of viscosity η is defined as the tangential force F required to maintain a unit velocity gradient between two parallel layers of liquid of unit area A. The coefficient of viscosity is a measure of the resistance of the fluid to deformation at a given rate due to internal friction.

Principle of coefficient of viscosity:
When a spherical body of radius r and density σ falls freely through a viscous liquid of density ρ and viscosity η, with terminal velocity v, then the sum of the upward buoyant force and viscous drag, force F, is balanced by the downward weight of the ball.

The terminal velocity depends directly on the square of the size (diameter) of the spherical ball. Therefore, if several spherical balls of different radii are made to fall freely through the viscous liquid, then a plot of v vs r2 would be a straight line. The slope of the graph is used to find the coefficient of viscosity of liquid.

### Requirements for this Science Experiment

• Stopwatch
• Glass jar apparatus
• Vernier caliper