What is Newton's law of gravity? (AQA A-Level Physics): Flashcards

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Moon constantly falling towards Earth but never reaches surface

Force $\propto \frac{1}{(\text{distance})^2}$

Directly proportional to product of masses

$F = \frac{Gm_1m_2}{r^2}$

$6.67 \times 10^{-11}$ N m$^2$ kg$^{-2}$

Henry Cavendish

Spherical objects with mass acting as if concentrated at centre

Reduces force to one quarter

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