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This force is directly proportional to the mass of the object . The weight of an object changes as the force of gravity changes , but its mass does not . An astronaut 's mass does not change just because she goes to the moon . But her weight on the moon is only one-sixth her earth-bound weight because the moon 's gravity is only one-sixth that of the earth 's . She may feel `` weightless '' during her trip when she experiences negligible external forces -LRB- gravitational or any other -RRB- , although she is , of course , never `` massless . ''
Please check all the words that can be used instead of the target word in the same context. Note that the morphology of the target (third person singular, past tense etc.) is considered to be applied to the candidate automatically in the process of paraphrasing.