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 Efficiency and Conservation Authority Energy Efficiency and Conservation Authority Energy Efficiency and Conservation Authority (EECA) is a New Zealand government/Crown agency responsible for promoting energy efficiency and conservation. The EECA was set up by the Fourth National Government of New Zealand in 1992 to encourage, support and promote energy efficiency, energy conservation, and the use of renewable sources of energy. The EECA, by promoting energy efficiency, helps to reduce climate change and GHG emissions through energy efficiency measures. In 2000 EECA became a Crown entity, established under the Energy Efficiency and Conservation Act 2000. It is subject to the Crown Entities Act 2004. The