Gravitational potential energy is the energy an object has by ... The weight \(W\) of the suit case is a downward force of size \(mg\). In lifting the suitcase, you would have to pull upwards ...

An elastic object, such as a spring, stores elastic potential energy when stretched or squashed. The extension of an elastic object is directly proportional to the force applied. This equation ...

Opinions expressed by Forbes Contributors are their own. Vikram Mittal is a contributor who covers aerospace and defense. Directed energy weapons conjure up images of the Death Star’s Superlaser ...