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 passing of the Energy Efficiency and Conservation Act meant that for the first time, New Zealand had a legislative basis for promoting energy efficiency, energy conservation, and renewable energy. The Energy Efficiency and Conservation Authority is responsible for preparing a national energy efficiency and conservation strategy for approval by the administering Minister. In 2004, EECA launched the Energywise Home Grants Programme to provide insulation retrofits to low-income owners of homes built before 1978. That year, minimum insulation standards were introduced to the New Zealand building code, and the majority of homes built prior to this had no insulation at all.