The difference between weight and mass often trips up college students, so let’s straighten this out. The mass of an object is how much stuff something is made out of, and the weight is the force of gravity acting on it. Mass deals with how much stuff there is, and weight deals with the pull of the Earth. Mass will never change no matter where you put the object, unless you take a bite out of it or pile more stuff on top of it. The weight can change depending on where you place it, like on another planet.
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Here’s a fun way to check your answers: https://www.exploratorium.edu/ronh/weight/
if you way something on earth and it ways 1 pound and .4 kiligrams. then you way the object on mars and it ways .38 pounds, is it .1 kiligrams?