Imagine a flat plate (length L and thickness D, L >> D) which is placed in a fluid that flows with velocity v. In these exercises, we are going to examine the two components of the drag force F_D. We know that the drag force consists of the form drag force and the friction drag force:

F_D = form drag + friction drag                 (units: Newton)

In each of the following situations, try to choose whether the form drag increases, decreases or is not influenced.

You can find this week’s formulas here.