They are not the same, because they are completely different concepts. They are more or less proportional - a mass of one kilogram will have a weight of approximately 9.8 Newton - because the gravity is more or less the same on different parts of the Earth: whether you are at the North Pole, or the Equator, the distance from the center of the Earth won't change much.
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Because mass is not the same as weight. Weight is mass times gravity so your weight will change if you are on the earth or moon but your mass will stay the same.
That is because Earth has more gravity. Weight = mass x gravity.
Your mass is always the same.
The object's mass is the same wherever it is. Mass doesn't change. What changes is the object's weight.The weight depends on what other mass happens to be nearby.When you know the object's weight on earth, multiply that by 0.1633 to find its weight on the moon.If you don't need it that close, it might be easier to just divide the earth weight by 6.
45 kg. The same. Your mass doesn't change on which planet you're on, but your weight does.