The third law of Newton's mechanics, which states that for every action, there is an equal and opposite reaction, can be a bit counterintuitive at first. However, this law is actually a consequence of the first two laws and the principle of conservation of momentum.

When an object exerts a force on another object, the second object will exert an equal and opposite force back on the first object. This reactive force comes from the second object, and it is a result of the first law of motion, which states that an object at rest will remain at rest and an object in motion will continue in motion with a constant velocity unless acted upon by an external force.

In other words, the reactive force is the force that the second object exerts to maintain its state of motion or to resist the force applied to it. This force is equal in magnitude and opposite in direction to the force applied by the first object, as required by the third law.
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