One of the first “roller-coaster” rides in the U.S. was actually a short coal railway in Pennsylvania that hauled coal downhill between mines and used mules to bring the empty cars back up the hill.

Roller coasters rely on two types of energy to operate: gravitational potential energy and kinetic energy. Gravitational potential energy is the energy an object has stored because of its mass and its ...

More than two dozen members of the Girl Scouts of Central Maryland came to Johns Hopkins University's Homewood campus Saturday to design and build miniature roller coasters out of cardboard boxes, ...