• JP Williams Gravitational Force: How it Works
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    Atimes you might wonder why we jump up and come down almost immediately, or why when we throw some object up they come down after some time. This is gravitational force at work. It helps keep the universe in equilibrium.

    Gravitation is a natural phenomenon by which physical bodies attract with a force proportional to their mass
    Gravitation is responsible for keeping the Earth and the other planets in their orbits around the Sun; for keeping the Moon in its orbit around the Earth; for the formation of tides; for natural convection, by which fluid flow occurs under the influence of a density gradient and gravity; for heating the interiors of forming stars and planets to very high temperatures; and for various other phenomena observed on Earth.
    Gravitation is one of the four fundamental interactions of nature, along with electromagnetism, and the nuclear strong force and weak force. Modern physics describes gravitation using the general theory of relativity by Einstein, in which it is a consequence of the curvature of spacetime governing the motion of inertial objects.

    Gravitational Force is the force attraction exerted by a body in all other bodies of the universe. Thus gravitational field is the region in which gravitational force is exterted.

    Newtons Law of Universal Gravitation
    This states that the force of attraction between two given particles is inversely proportional to the square of their distance apart.
    Thus mathematically,

    F & MM/r^2
    F = GMM/r^2

    where,
    F = force of attraction
    G = gravitational constant
    M = individual particles of masses
    r = distance between the masses

    Eg: if a proton mass is 1.67x10^-27kg, electron mass is 9.11x10^-31kg and radius of hydrogen atom is 0.53x10^10m. Calculate the force of attraction. Take G = 6.67x10^-11Nm^2/kg^2.

    F = GM1M2/r^2
    M1 = Mass of Proton
    M2 = Mass of electron

    F = (6.67x10^-11 x 1.67x10^-27 x 9.11x10^-31)/(0.53x10^10)^2
    F = 3.61x10^-87
    22 April 2011Comment
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