forta de atractie dintre cele doua corpuri este
F1 = k mā mā / rĀ² = k mĀ²/rĀ²
unde k = constanta gravitationala
mā si mā masele celor doua corpuri
r = distanta dintre centrele lor de masa
transferand jumatate din masa primului corp catre cel de al doilea, forta devine
F2 = k mā' mā' / rĀ²
m'ā = m/2
mā' = m+m/2 = 3m/2
F2 = (k mā/2 x 3m/2)/rĀ² = k x mĀ²x 3/4 x1/rĀ² = 3/4 x F1
