How Tungsten Alloy Disc Work?

Pinewood derby cars are gravity-powered vehicles. They start the race on a sloped track held back by starting pins. When the pins drop, the cars roll down the sloped track towards the finish line, guided by rails. Most tracks are built with a transition from the sloped starting section to a long flat section. On these tracks, cars must complete the flat section while maintaining as much speed as possible. Weight to volume ratio of tungsten alloy disc is essential here. Maximal energy is generated without creating additional air drag.