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.
the tongue where top side of it is covered in small protrusions called papillae. There are red patches on the surface bordered by grayish. white. The diseases cause the papillae to disappear and replace them with white grayish patches which can disappear and reappear in hours or days or change in shape or size.