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Weight is the force due to gravity, which on earth is mg. An object has no weight when there is no acceleration due to gravity.
Alternatively, I guess an object could be considered weightless if something cancels out mg, like objects with densities identical to water that are submerged in water. This is why NASA conducts some of its training underwater and why senior citizens excercise in water. They don't have to deal with the forces being exerted by that pesky gravity.
Tell us what question/answer/explanation is giving you trouble and we can probably give a better response.
-X
Alternatively, I guess an object could be considered weightless if something cancels out mg, like objects with densities identical to water that are submerged in water. This is why NASA conducts some of its training underwater and why senior citizens excercise in water. They don't have to deal with the forces being exerted by that pesky gravity.
Tell us what question/answer/explanation is giving you trouble and we can probably give a better response.
-X
Abe said:
