Example 1
A 1 kg mass at Earth’s surface is attracted with about 9.82 N using Earth’s mass and mean radius.
Mendeleev
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Physics tools › Universal gravitation
Mendeleev · Physics
Universal gravitation
Newton’s law of universal gravitation gives the magnitude of the attraction between two point masses, or spherical masses treated from their centres.
Formula usedF = Gm₁m₂/r²
Visual cue · circular motion
Calculate
Universal gravitation
What do the symbols mean?
Fforce
mmass
Mcentral mass
rradius
Two worked examples
Example 2
Doubling the centre-to-centre distance divides gravitational force by four.
Good to knowDistance r is measured between centres of mass. The calculator uses the 2022 CODATA value of G.