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Originally Posted by Nebe
mass is the physical volume or bulk of a solid body. A nail made out of steel will never weigh as much as a nail made out of a heavier metal such as lead that is the same mass as the steel nail.
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The derivative of Newton's second law is
Weight = Mass x Gravity
If the nails are the exact length and diameter but different weights the mass is different per the law. Therefore the mass is different and not the same.