Physics Review Question Unit: Mechanics Year: 1989 Question#: 18 Question: The diagram at the right shows spheres A and B with masses of M and 3M, respectively. If the gravitational force of attraction of sphere A on sphere B is 2 Newtons, then the gravitational force of attraction of sphere B on sphere A is (1 ) 9N (2 ) 2N (3 ) 3N (4 ) 4N What is this question really asking? Explanation by: Anna R [ Return to question menu ] Answer 1 9N INCORRECT The gravitational attraction between two masses is equal both ways, the force of mass A on mass B is equal and opposite to the force of mass B on mass A.  return to top Answer 2 2 N CORRECT The gravitational attraction between two masses is equal both ways, the force of mass A on mass B is equal and opposite to the force of mass B on mass A.  return to top Answer 3 3 N INCORRECT The gravitational attraction between two masses is equal both ways, the force of mass A on mass B is equal and opposite to the force of mass B on mass A.  return to top Answer 4 4 N INCORRECT The gravitational attraction between two masses is equal both ways, the force of mass A on mass B is equal and opposite to the force of mass B on mass A.  return to top What's this question really asking? How do objects relate to each other in terms of gravitational force? (What is Newton's third law...law of force pairs!) return to top
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