Question

The resistive force (drag force) applied on an object moving in a gas is described by:

Answer 1

the resistance force of the medium, acting in the opposite direction of motion of the particle itself.

It is important to consider that motion in a medium can occur smoothly (laminar motion) or abruptly and tortuously (turbulent motion).

The resistance force can be expressed using Newton's law:

$$R = \zeta S {\omega^2 \rho \over 2},$$

where $\zeta$ - medium resistance coefficient; $S$ - sectional area of the particle itself; $\omega$ - particle velocity relative to the medium (including gaseous); $\rho$ - density of a gaseous substance, which is the medium of particle motion.

Unit Type: Newton (N)