Question

What happens to the drag force on spheres with increasing radius size?​

Answer 1

Answer:

Explanation:

See, by Stokes' law drag is directly proportional to radius. As radius goes on increasing drag force must also be increased. Hope it helped.

Answer 2

Drag force will increase with the radius of the spherical object

Explanation:

Essentially the drag on the sphere is given by the Stoke's law  

$F_{d} = 6\pi \eta r\upsilon$

Where,  

$F_{d} =$ frictional force – known as Stokes' drag – acting on the interface between the fluid and the particle

$\eta =$ viscosity of the medium

$r =$ radius of the spherical object

$\upsilon$ = flow velocity relative to the object

Due to boundary conditions on the velocity at the surface of the sphere objects and at infinity ensure that pressure and shear stress increases as $\frac{1}{r_{2}}$. When the pressure and shear stress are integrated over the surface of the sphere objects.