Newton's law of gravitation

Change the masses and the distance between them to see the gravitational force and how it falls with distance squared.

Works in metric or imperial units.

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Questions students ask

What is the inverse square law?

Double the distance and the force falls to a quarter; triple it and it falls to a ninth.

What formula does it use?

F = Gm₁m₂/r², G = 6.67 × 10⁻¹¹ N m²/kg².

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