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 Answers (1) Follow Following Unfollow Pending Disabled. A RealAge answered. A smooth spot on the tongue can have several causes, but it may be linked to a general condition called glossitis, in which the tongue can swell and change colors. With glossitis, the tiny projections called papillae normally found on the tongue are lost and the surface becomes smooth in patches or over the entire tongue.