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.
7 steps to using PVA to glue wood. 1  Squeeze the glue onto the surface of both of the bits of wood you want to glue together. 2  Remove any excess or spills immediately using a damp cloth. 3  Use either a specialist plastic spreader or a brush to spread a thin coat of glue over the surface of both pieces of wood.