# Newton's 3rd Law And Free Body Diagrams

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question
Every force has one and only one 3rd law pair force.
True
question
The two forces in each pair act in opposite directions.
True
question
The two forces in each pair can act on the same object or on different objects.
False
question
The two forces in each pair may have different physical origins (for instance, one of the forces could be due to gravity, and its pair force could be a normal contact force).
False
question
The two forces of a 3rd law pair always act on different objects.
True
question
Given that two objects interact via some force, the accelerations of these two objects have the same magnitude but opposite directions. (Assume no other forces act on either object.)
False
question
According to Newton's 3rd law, the force on the (smaller) moon due to the (larger) earth is
equal in magnitude to, and in the opposite direction from, the force on the earth due to the moon.
question
An object is at rest on a tabletop. Earth pulls downward on this object with a force equal in magnitude to mg. If this force serves as the action force, what is the reaction force in the action-reaction pair?