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How convert mass to weight?

Updated: 9/16/2023
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12y ago

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You convert mass to weight by multiplying by the local acceleration due to gravity ...

f = ma

... where f is the force in newtons, mass is the mass in kilograms and a is the acceleration in meters per second squared. For the Earth, a is 9.81, so a mass of 100 kg has a weight of 981 newtons.

It is "common" though erroneous to say that the "weight" of the 100 kg object is 100 kg. It is precisely correct to say the weight is 981 newtons, on the Earth, but we generally accept the implicit conversion for G=9.81 in the statement that the weight is 100 kg, just not on a physics test.

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