It's only a convenient way of remembering. An apple has a mass of about 0.1 kg and g is about 9.8 m/s/s. So F=mg. There ya' go!
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On earth, 1 gram of mass weighs 0.0098 newton (0.03527 ounce).
On earth, 1/8th gram of mass weighs (0.000125 x 9.8) = 0.001225 newton (0.00449 ounce, rounded) On the moon, the same 1/8th of a gram would weigh 0.0002 newton (0.00072 ounce)
1 newton is the same weight as about 3.6 ounces of mass (on Earth). That's only about 0.225 pound. 1 pound produces about the same force as 4.448 newtons of weight (on Earth). Technically a Newton is the correct unit of measurement for weight, whilst pounds and ounces (lb/oz) are units of mass.
Newton- Sir Isaac Newton newton- a unit of measure units of measure are not capitalised, though their abbreviations may be: one newton = 1 N, one pascal = 1 Pa