An object of mass m rests on a flat table. The earth pulls on this object with a force of magnitude mg . What is the reaction force to this pull?
A) The table pushing up on the object with force mg .
B) The table pushing down on the floor with force mg .
C) The object pushing down on the table with force mg .
D) The table pulling upward on the Earth with force mg .
E) The object pulling upward on the Earth with force mg .

Question

An object of mass  m  rests on a flat table. The earth pulls on this object with a force of magnitude  mg . What is the reaction force to this pull?
A) The table pushing up on the object with force  mg .
B) The table pushing down on the floor with force  mg . 
C) The object pushing down on the table with force  mg .
D) The table pulling upward on the Earth with force  mg .
E) The object pulling upward on the Earth with force  mg .

Quizplus · Accepted Answer

According to Newton's third law, every action has an equal and opposite reaction. The Earth pulls the object downward with a force of mg, so the object pulls upward on the Earth with an equal force of mg.

An Object of Mass M Rests on a Flat