Newton's cradle Newton's cradle Newton’s cradle is a device that demonstrates conservation of momentum and energy using a series of swinging spheres. When one sphere at the end is lifted and released, it strikes the stationary spheres, transmitting a force through the stationary spheres that pushes the last sphere upward. The last sphere swings back and strikes the still nearly stationary spheres, repeating the effect in the opposite direction. The device is named after 17th-century English scientist Sir Isaac Newton. It is also known as Newton's balls or Executive Ball Clicker. A typical Newton's cradle consists of a series of identically sized
Energy Policy and Conservation Act petroleum based fuels was extended through 1977. This mechanism would reduce the use of these fuels for power generation and free them for use by other consumers. Furthermore, the President was given authority to order maximum domestic oil and gas production, and the President was directed to submit plans for energy conservation and energy rationing in case of a fuel shortage. Energy Policy and Conservation Act The Energy Policy and Conservation Act of 1975 (EPCA) () is a United States Act of Congress that responded to the 1973 oil crisis by creating a comprehensive approach to federal energy policy. The