WEIGHT

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The weight of an object is the force of gravity on the object and may be defined as the mass times the acceleration of gravity, w = mg. Since the weight is a force, its SI unit is the newton. The density is mass/volume.
What is the weight of a 40 kg object?
On the surface of the moon, an object with a mass of 40 kg will weigh approximately 64 Newtons. F = 64 N.
What is the weight of a 1kg object on earth?
You can easily calculate an object's weight from its mass, or the mass from its weight. In physics the standard unit of weight is Newton, and the standard unit of mass is the kilogram. On Earth, a 1 kg object weighs 9.8 N, so to find the weight of an object in N simply multiply the mass by 9.8 N.
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