A flat body moves over a fixed surface with a thin Newtonian liquid film between them. Assume the velocity profile in the film is linear. Which statements are correct?
Select all that apply

Question

A flat body moves over a fixed surface with a thin Newtonian liquid film between them. Assume the velocity profile in the film is linear. Which statements are correct?

G1 Physics · Accepted Answer

For a linear velocity profile, F(viscous) = ηAv/d. Therefore increasing d reduces the force if η, A and v are fixed. The force is directly proportional to v. For a block descending an incline steadily with no other resistance, mg sinθ = F(viscous). Therefore all four statements are correct.