Which of the following parameters influence the form drag?
A. Relative mass
B. Form drag coefficient
C. Relative velocity
D. Frontal surface area
E. Squared relative velocity
Choose the correct answer from the options given below:

Correct option is C

Form drag, also known as pressure drag, arises due to the shape of an object moving through a fluid (e.g., air or water). The following parameters influence form drag:
1. Form Drag Coefficient (B): This is a dimensionless number that quantifies how the shape of an object contributes to drag. A streamlined shape has a lower drag coefficient, reducing form drag.
2. Frontal Surface Area (D): The larger the frontal area of the object, the greater the form drag. For example, a cyclist in an upright position experiences more drag than one in a crouched position.
3. Squared Relative Velocity (E): The drag force is proportional to the square of the relative velocity (v2v^2v2). Faster-moving objects experience significantly greater drag due to this relationship.
Explanation of Other Options: · Relative Mass (A): This influences inertial effects but is not a factor in form drag, which depends on shape and flow dynamics.
· Relative Velocity (C): While velocity influences drag, it is the square of velocity (E) that directly affects the drag force in fluid dynamics.
Correct Answer: (c) B, D, E only Information Booster: 1. Drag Equation:
Fd=12ρCdAv2F_d = \frac{1}{2} \rho C_d A v^2Fd​=21​ρCd​Av2
Where:
· FdF_dFd​: Drag force
· ρ\rhoρ: Fluid density
· CdC_dCd​: Drag coefficient
· AAA: Frontal surface area
· v2v^2v2: Squared relative velocity
2. Types of Drag:
· Form Drag: Depends on shape and surface area.
· Skin Friction Drag: Results from the surface's roughness.
· Wave Drag: Occurs at the interface of water and air for objects like boats or swimmers.
3. Minimizing Form Drag:
· Streamlining shapes (e.g., teardrop designs for cars).
· Reducing frontal area (e.g., aerodynamic cycling postures).