A centripetal force (from Latin centrum center and petere to seek) is a force that makes a body follow a curved path. Its direction is always orthogonal to the motion of the body and towards the fixed point of the instantaneous center of curvature of the path.
There are a number of things that can cause a whitish coating or white spots to develop on the tongue, including the f ollowing: 1  Leukoplakia. 2  Oral thrush. 3  Oral lichen planus.
Fordyce spots on lips or other parts of the body are believed to be caused by sebum which is the natural oil of the skin. This oil gets trapped in a sebaceous gland that does not have hair. In most cases, sebaceous glands open into a hair follicle or pore on skin and its oil is secreted up the hair shaft. But in the case of Fordyce spots, no hair means there is no way to discharge the natural body oil secretions.