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.
PVA Glues. Plain old white glue. PVA (Polyvinyl acetates) are probably the most common adhesive on the market. They come in a variety of formulas, all ever so slightly different, and specific to what they are designed to glue. Here are some tips for using Polyvinyl acetates.1  All PVAs are designed to work on porous materials only. PVAs are water based, and clean up with warm soapy water. 2  PVA is only toxic to ingest, it does not emit any harmful fumes, and is not hazardous to touch. 3  PVA sets best in good air circulation, at room temperature. 4  PVAs need pressure to adhere, see our info on clamping.