Newtons Second law of Motion

Van DE Graff Generator also known as Electrostatic Generator. It consists of two insulated pulleys hand driven by rubber belt. The generator is self exiting and charge separation occurs. The resulting positive and negative charges being carried off by combs at lower and upper pulleys. A metal sphere surrounds the upper pulley assembly and charge accumulates on the sphere, which is insulated by a plastic column supporting the pulley assembly. The charge builds up until electrical breakdown of air surrounding the sphere occurs. Supplied with discharging sphere.