# 萬有引力

(由引力跳轉過嚟)

 「 宇宙入邊每個質點都憑一種力吸引其他各個質點，之同佢哋質量乘積成正比、同佢哋之間個距離平方成反比。Every particle in the universe attracts every other particle with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. 」 ——艾薩克·牛頓，《自然哲學嘅數學原理》

${\displaystyle F=G{\frac {m_{1}m_{2}}{r^{2}}}}$