Say you have two plastic balls each has a mass of 500 grams, one is on earth, and the other one is on the moon. Identical objects with identical mass. The one on earth would weigh 500 grams=.5 kg=1.1 lbs. The one on the mood would weigh 82.67 grams=.0827 kg=.182 lbs. Mass is the amount of matter of an object, in this case they are identical, but weight is affected by gravity, which there is less of on the moon.
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