# Stokes' Law: Why does viscous drag depend upon the radius of the spherical body?

Kaushik
Stokes' Law gives us the value fo viscous force when a spherical body is under motion inside a fluid.
##F_{viscous} = 6\pi\eta av## (where ##a## is the radius of the spherical body and ##v## is the velocity with which it is moving)
What is the reason for the Viscous drag to depend upon the radius of the spherical body?

Homework Helper
The more area, the more grip !

Kaushik
Kaushik
The more area, the more grip !
Is it like, more the area, more fluid in contact. Hence, it pulls more fluid with it, consequently the reaction force by the fluid on the body is more?