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JAMB Physics 2012 Question 8

Question 8

Gravitational Field

A rocket is fired from the earth's surface to a distant planet. By Newton's law of universal gravitation, the force F will

  1. A.increase as a r reduces
  2. B.increase as G varies
  3. C.remains constant
  4. D.increases as r increases.
Show the answer and explanation

Answer: A (increase as a r reduces)

Explanation

F = Gm1m2/r2, so the gravitational force gets bigger as the distance r between the bodies gets smaller.