This setup demonstrates Newton’s third law of motion by showing that for every action (force exerted by balance A on balance B), there is an equal and opposite reaction (force exerted by balance B on balance A). These forces act on two different objects simultaneously.
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This setup demonstrates Newton’s third law as follows: when an object exerts its weight (action force) downward onto the spring balance, the balance exerts an equal and opposite force (reaction force) upward on the object. This interaction illustrates that forces always occur in pairs, with each force being accompanied by an equal and opposite counterpart.