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.
Another 21 national unions were organized in the 1860s. By the early 1870s, about 300,000 workers were organization, making up about nine percent of the industrial labor force. But during the financial depression from 1873 to 1878, membership in labor organizations fell to just 50,000. The Knights of Labor.