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.
Lichen planus, a rare rash condition may cause white stripes to appear on the tongue. It may feel itchy and you may note the rash appearing on other parts of the body, especially the on the wrists, forearms, midback and above the ankles.