1 AFib reduces the ability of the atria to pump blood into the ventricles, and usually causes the heart to beat too rapidly. 2  One-half million new cases of atrial fibrillation are diagnosed every year in the U.S., and billions of dollars are spent annually on its diagnosis and treatment.
noun, (used with a singular verb) 1. the branch of mechanics that deals with the motion of air and other gases and with the effects of such motion on bodies in the medium. Compare aerostatics (def 1). Origin of aerodynamics.
Aerodynamics Aerodynamics is the study of forces and the resulting motion of objects through the air. Studying the motion of air around an object allows us to measure the forces of lift, which allows an aircraft to overcome gravity, and drag, which is the resistance an aircraft âfeelsâ as it moves through the air. Everything moving through the air (including airplanes, rockets, and birds) is affected by aerodynamics. In this section, we will explore how lift and drag work at both subsonic speedsâslower than the speed of soundâand, later, at supersonic speedsâfaster than the speed of sound.