An object has kinetic energy when itâs in motion. The amount of kinetic energy an object has depends on its mass and speed. Potential energy, on the other hand, is a stored energy when an object is at rest. It describes how much work the object could do if set into motion. Itâs an energy we can generally control. When an object is set into motion, its potential energy transforms into kinetic energy.
The Knights of Labor, the first national industrial union in the United States, was founded in Philadelphia on December 9, 1869, by Uriah Stephens (1821-82) and eight other Philadelphia garment cutters.
1868 First federal eight-hour law passed - applied only to laborers, workmen, and mechanics employed by the . government. Anthracite Coal Strike. 1869 Colored National Labor Union founded. Knights of Labor organized in Philadelphia. Troy, New York, Collar Laundresses' Strike. 1870 First written contract between coal operators and coal miners signed