Solid Friction: Viscosity Quiz App Download (Free) & e-Book - 846

For a sphere that is dropped into a viscous liquid, Strokes law states that the force of friction is given by

1. 6π × radius of the sphere × coefficient of viscosity × velocity of the sphere at a particular instant
2. (6π × radius of the sphere × coefficient of viscosity) ⁄ velocity of the sphere at a particular instant
3. (6π × radius of the sphere) ⁄ (coefficient of viscosity × velocity of the sphere at a particular instant)
4. 6π ⁄ (radius of the sphere × coefficient of viscosity × velocity of the sphere at a particular instant)