Mass and weight are two different things. It does not make sense to ask which is more accurate.
Mass is used to measure an object's ability to resist a force. f = ma, or m = f/a.
Weight is used to measure an object's force applied due to gravity. Measured in newtons, f = ma, or newtons = kilograms time 9.81 meters per second squared.
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because of the mass
if seesaw is balanced under its own weight with no added mass on it you cannot balance on one side. If it is unbalanced under its own weight u can add mass to balance on one side with mass depending on distance to pivot
Weight = (mass) x (local acceleration of gravity). Mass = (weight) / (local acceleration of gravity) If you know the weight and the local acceleration of gravity, you can calculate the mass. Anywhere on or near the surface of the earth, the local acceleration of gravity is about 9.82 meters per second2 . As an example, an object with a weight of 9.82 newtons has a mass of one kilogram.
Depend on what exactly do you mean by 'common'. On one hand there are countless photon everywhere which has zero mass. But if you mean everyday objects, then zero weight of cause (free fall, space etc), as I don't think zero mass is even attainable at this scale.
A pound (lb) is a measure of mass which is not the same as weight. An oject with a mass of 2240 pounds on earth would have a mass of 2240 pounds on the moon. But the weight of the object would be only one sixth on the moon. A mass of 2240 lb is equivalent to an Imperial ton.