What happens to the magnitude of action and reaction forces in Newton’s third law pairs?
They are always equal in magnitude and opposite in direction
Newton's third law states that for every action there is an equal and opposite reaction. Whenever two objects interact, the force exerted by the first object on the second is exactly equal in magnitude to the force exerted by the second on the first, and the two forces act in opposite directions along the same line.
The magnitudes never depend on which object is heavier: even when a truck hits a small car, both experience the same magnitude of force. The two forces do not cancel because they act on different bodies; each produces its own effect on its own object. They also do not combine to make a stronger force for the same reason.
Hence, the answer is They are always equal in magnitude and opposite in direction.
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