where is the centripetal acceleration. The direction of the force is toward the center of the circle in which the object is moving, or the osculating circle (the circle that best fits the local path of the object, if the path is not circular). The speed in the formula is squared, so twice the speed needs four times the force.
PVA (polyvinyl acetate). PVA's are the traditional wood glues, and some of the most common adhesives. They are also called aliphatic resins. They provide a strong wood-to-wood bond but will not adhere strongly or consistently to nonporous materials, such as metal or plastics.
Uses: 1  as wood glue PVAc is known as white glue and the yellow as carpenter's glue or PVA glue. 2  as paper adhesive during paper packaging converting. 3  in bookbinding and book arts, due to its flexible strong bond and non-acidic nature (unlike many other polymers). 4  in handicrafts. 5  as envelope adhesive. 6  as wallpaper adhesive. 7  as a primer for .... Polyvinyl alcohol -[HOCHCH 2 ]-: Polyvinyl acetate is partially or completely hydrolysed to give polyvinyl alcohol. 2  This reversible saponification and esterification reaction was a strong hint for Hermann Staudinger in the formulation of his theory of macromolecules.