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.
Elmers glue is PVA (PVAC) based-but has lots of other stuff (tackifiers and solvents), and has a pH of 5 (meaning it is acidic).For book binding, I would definitely recommend using a pH neutral PVA based glue that is specific to book binding.The acid in Elmers has a nice way of breaking down the cellulose in paper over time, and who knows what the other ingredients might do. GarrasP chemantics 1 month agoReply.or book binding, I would definitely recommend using a pH neutral PVA based glue that is specific to book binding. The acid in Elmers has a nice way of breaking down the cellulose in paper over time, and who knows what the other ingredients might do. GarrasP chemantics 1 month agoReply.