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The gravitational force between masses depends on the distance between them.

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The force (and reaction) can be calculated from:

:

f (newtons) = (G * 7 * 4) / d2

where:

G = newtons gravitational constant ( 6.672 * 10 -11)

d = distance between centres of gravity in metres

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Example: a distance of 0.1 metres between the masses would exert a force of

on each mass of 1.868 * 10 -7 newtons

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