Calculadora da Terceira Lei de Newton

The Newton's Third Law Calculator is a free online tool that allows you to verify the action-reaction principle. It calculates the reaction force from a given action force, following the law that states forces have the same magnitude, same direction, and opposite senses. Ideal for physics students and professionals who need quick confirmation in dynamics problems.

The operation is simple: you enter the value of the action force (in Newtons) and the calculator returns the value of the reaction force, which is exactly the same magnitude but with opposite sign. The formula used is F_action = -F_reaction, where the negative sign indicates the opposite direction. The tool can also be used to understand force pairs in everyday situations, such as pushing an object or walking.

Use this calculator when solving physics exercises involving Newton's third law, such as collision problems, rocket propulsion, or simply to confirm that the force you exert on an object is equal to the force the object exerts back. It is also useful in educational experiments and quick concept checks.

Caution: Newton's third law applies to pairs of forces on different bodies. Do not confuse it with equilibrium of forces on the same body. The calculator assumes that the forces are applied to distinct bodies and that no other forces are involved. For systems with multiple interactions, each pair must be analyzed separately.