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PHY4A




Newton's Law of universal gravitation
Statement:

Every particle in the universe attracts every other with a force which is directly proportional
to the product of their masses, and inversely proportional to the square of their separation.

The law is usually summarized using this diagram:




Equation

The law gives this…

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PHY4A




Motion of planets and satellites

For an object in orbit, the centripetal force required to keep it moving in a ircle is provided by the
gravitational force, given by the equation:

F = GMm



Thus:

GMm
r² = m²r


Where M is the mass of the object being…

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