Learn how to calculate gravitational forces on a spacecraft from Earth and the Moon! Step-by-step physics tutorial covering force equations, vectors, and practical examples for orbital mechanics.

General relativity explains gravity as the distortion of space-time. Quantum mechanics explains other forces using exchanged "virtual particles." Unifying gravity with quantum mechanics is a major ...

Researchers have succeeded in measuring the gravitational field of a gold sphere, just 2 mm in diameter, using a highly sensitive pendulum - and thus the smallest gravitational force. The experiment ...