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
Massachusetts Executive Office of Energy and Environmental Affairs several constituent departments, which are responsible for the administration of the office's work. Each department is headed by a director, who is appointed by the governor. Massachusetts Executive Office of Energy and Environmental Affairs The Massachusetts Executive Office of Energy and Environmental Affairs (EOEEA) is a Cabinet level agency under the Governor of Massachusetts. EOEEA is responsible for promoting efficient energy use throughout the Commonwealth while protecting and preserving Massachusetts' natural environment. The agency is under the supervision and control of the Secretary of Energy and Environmental Affairs, who is appointed by the Governor. The current Secretary of Energy and