Drag forces acting on an object moving in a fluid oppose the motion. For larger objects (such as a baseball) moving at a velocity in air, the drag force is determined using the drag coefficient, the a...Drag forces acting on an object moving in a fluid oppose the motion. For larger objects (such as a baseball) moving at a velocity in air, the drag force is determined using the drag coefficient, the area of the object facing the fluid, and the fluid density. For small objects (such as a bacterium) moving in a denser medium, the drag force is given by Stokes’ law.
Drag forces acting on an object moving in a fluid oppose the motion. For larger objects (such as a baseball) moving at a velocity in air, the drag force is determined using the drag coefficient, the a...Drag forces acting on an object moving in a fluid oppose the motion. For larger objects (such as a baseball) moving at a velocity in air, the drag force is determined using the drag coefficient, the area of the object facing the fluid, and the fluid density. For small objects (such as a bacterium) moving in a denser medium, the drag force is given by Stokes’ law.