Class 11

Physics

Mechanics

Mechanical Properties of Fluids

Spherical balls of radius R are falling in a viscous fluid of velocity v. The retarding viscous force acting on the spherical ball is

- directly proportional to R but inversely proportional to v.
- directly proportional to both radius R and velocity v.
- inversely proportional to both radius R and velocity v
- inversely proportional to R but directly proportional to velocity v

Where $R=$Radius of ball

$v=$velocity of ball

$η=$coefficient of viscosity

$∴F∝R$ and $F∝v$ or in words,

Retarding force is directly proportional to both $R$ and $v$