The force exerted by spring balance A on balance B can be considered as the action force, and the force exerted by balance B on balance A can be considered as the reaction force, or vice versa. Both forces are equal in magnitude and opposite in direction.
In the context of the spring balances, what can be considered as action and reaction forces?
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In the context of spring balances, the action force is the gravitational force exerted by an object being weighed on the Earth. The reaction force is the upward force exerted by the spring balance on the object, equal in magnitude and opposite in direction to the gravitational force, indicating the object’s weight.