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The mass of an object can be subtracted or added. For example, with water, you can just add more to have a larger mass. With ice, you can just chop off a portion to lessen its mass.
Though, if you take a piece of paper and crumple it up, the mass will stay the same.
It just depends on the context of the situation.
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Does the mass of an object always stay the same?
Yes
Why will a person's mass never change whether they are on earth or on the moon?
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.
When you cut an apple into pieces does its mass stay the same or does it get smaller?
Its mass remains the same (except for the very small amounts that stick to the knife blade).
When a person takes a bite out of the apple do the apple mass stay the same?
No because now part of the apple is missing so the mass would be less. The total mass of the apple is not changed, but part of the mass is now in the biter's mouth.
If an object has a mass of 70 kg and a weight of 686 N on Earth what would the object's mass and weight on Jupiter be?
Your mass is always the same.
