An apple falls from a tree because of gravitational attraction between the earth and apple. If F1 is the magnitude of force exerted by the earth on the apple and F2 is the magnitude of force exerted by apple on earth, then (a) F1 is very much greater than F2 (b) F2 is very much greater than F1 (c) F1 is only a little greater than F2 (d) F1 and F2 are equal

Answer: (d) F1 and F2 are equal

Newton’s third law of motion states that when one body exerts a force on the other body, the first body experiences a force that is equal in magnitude in the opposite direction of the force which is exerted.

  • F1 and F2 are equal because Newton’s third law of motion is obeyed by Newton’s law of gravity. When one object exerts a force on another, the second object responds by exerting an equal and opposite force on the first.
  • An apple falling down has the force of gravity acting downward (F1) which is the action. The opposite reaction is the force the apple exerts on the earth (F2).

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