• Gravitation | Physics | Khan Academy

      www.khanacademy.org/science/physics/newton-gravitation Gravity is the force of attraction between masses. It's the thing that pulls you down to earth. Here, you'll learn precise meanings of the words mass and weight, and ...
    • Sir Isaac Newton: The Universal Law of Gravitation

      csep10.phys.utk.edu/astr161/lect/history/newtongrav.html There is a popular story that Newton was sitting under an apple tree, an apple fell on his head, and he suddenly thought of the Universal Law of Gravitation.
    • gravitation | physical process | Britannica.com

      www.britannica.com/science/gravitation-physical-process ...Gravitational forces are never uniform, and therefore only the centre of mass is in free-fall. All other points of a body are subject to tidal forces because they ...
    • Gravitation | Define Gravitation at Dictionary.com

      dictionary.reference.com/browse/gravitation noun 1. Physics. the force of attraction between any two masses. Compare law of gravitation. an act or process caused by this force. 2. a sinking or falling. 3. a ...