How air friction affects motion of objects.Explain how air friction is reduced in its case?
Air friction (also called drag) is what causes an object (that is moving through the air) to lose kinetic energy. Some of the energy is transferred to the air molecules by knocking them out of the way and/or by dragging them along. Air friction can be reduced by increasing the smoothness of the object (so it can’t drag as much air with it). It can also be reduced by changing the shape of the object: if the shape is narrow (more like a needle than like a ball), then not as much air gets run into, and pushed aside, while the object moves forward.
