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.
A lot of art or craft projects call for PVA glue... I don't know how many times I thought this was some sort of special glue. I figured if I didn't have it, I'd better just forget about the project until I could get my hands on some of this stuff.Well, it turns out it's actually the most common white glue around.hat's THE glue they're talking about! To start with, PVA stands for Polyvinyl acetates. Hey, I don't make this stuff up...I just read it somewhere. So don't get all bent out of shape trying to find some super-special version of it.