If the distance between two suspended masses 10kg each is tripled, the gravitational force of…

Physics JAMB 2002

If the distance between two suspended masses 10kg each is tripled, the gravitational force of attraction between them is reduced by

  • one half
  • one third
  • one quarter
  • one ninth checkmark

The correct answer is: D

Explanation

Let the distance apart the two masses = m.
From the equation F & M1 m2/ϒ2
F1 α 10 x 10/ϒ2 = F α 100/ ϒ2
F2 α 10 X 10/(3ϒ)2 => F2 α 100/9ϒ2
therefore F2/F1 = 100/9ϒ2/100/ϒ2 = 100/9ϒ2 ϒ2/100 = 1/9
Therefore F 2 : F 1 = 1 : 9
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