Question

Viscous drag force depends on

• A. Size of body
• B. Velocity with which it moves
• C. Viscosity of fluid
• D. All of these

Answer 1

The correct option is D All of these

The drag force or viscous force acts on the body in a direction opposite to the velocity of the body. The viscous force is given as
$F_v=6\pi r\eta v$
where,
$F=\text{Drag Force}\eta =\text{Viscosity of fluid}A\left(\text{Area}\right)\propto \text{size of body}\propto rv=\text{Velocity of body}$