By attaching one end of a spring balance to a fixed support and applying a force through the free end of another spring balance, you can observe that both spring balances show the same reading. This demonstrates that the force exerted by one spring balance on the other is equal but opposite in direction, illustrating the third law of motion.
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To demonstrate Newton’s Third Law of Motion with two spring balances, connect them with a rigid rod. Hang one balance vertically and attach a mass to it. As the first balance pulls down, the second balance will register an equal force but in the opposite direction. The hanging mass on the first balance is the action, and the tension in the rod is the reaction. The readings on the spring balances will be equal in magnitude but opposite in direction, illustrating the law of action and reaction forces. This simple setup visually reinforces the fundamental principle of equal and opposite forces in Newton’s Third Law.