Giulio's bag of marbles is twice as heavy as Jim's. If it takes 5 extra marbles to make Jim's bag feel heavier, it will take 10 extra marbles to make Giulio's bag feel heavier. This best illustrates:

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Quizplus · Accepted Answer

This scenario illustrates Weber's law, which states that the perceived difference between two stimuli is proportional to the magnitude of the stimuli. In this case, the amount of marbles needed to make Jim's bag feel heavier is 5, which is proportionate to the weight of his bag. Similarly, it takes 10 extra marbles to make Giulio's bag feel heavier, which is proportionate to the weight of his bag being double the weight of Jim's.

Giulio's Bag of Marbles Is Twice as Heavy as Jim's