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.
A RealAge answered. Yellow tongue usually occurs when the papillae (tiny projections) on the surface of your tongue become enlarged and yellow-colored from bacteria growing in your mouth. Most often, yellow tongue is an early sign of a harmless condition called black, hairy tongue, which is usually brought on by: poor oral hygiene.