Are you saying that a cave man didn't know the difference between a small stone and large rock when either one was dropped on his toe? I'm saying he knew quite well that the rock would hurt more than the stone because he already knew instinctively about the direct relationship between mass and force
Your assuming here now let me assume. The cave man didn't know of mass or force, he just new from prior experience that a large rock would cause greater pain then a smaller rock. He didn't know how this worked he just knew it would.
Knowing the outcome of an action dose not mean you know the reason for its consequence.
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