What are drag, air resistance, velocity, terminal velocity & acceleration due to gravity and how do these…?
Drag is the amount of force felt in resistance to motion because of friction within the medium. Example: a plane flying through the air. Air resistance is is the result of collisions of molecules of air with objects attempting to move. The amount of air resistance felt is proportional to the cross sectional area of an object and its velocity. Velocity is speed with a specific direction. The direction is important, as equal magnitude but opposite directions of velocity are possible. Terminal velocity is the speed at which the force of gravity downward is equal to the force caused by air resistance upward on an object. It’s a balancing act. This is why you fall slower when you fan out your arms or use a parachute. Acceleration due to gravity is just as it sounds. Gravity creates a potential field around massive objects (well all objects actually, but massive ones have much greater influence). When you jump out of a plane or off a high cliff or whatever, you immediately accelerate at 9.8m
