Question

A person has mass 80 kg on earth. What is his weight on earth?

Answer 1

I think it will have 10kg.

Answer 2

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What is the weight of a man with a mass of 80 kg on Earth and the moon?

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Expert Answers

BANDMANJOE | CERTIFIED EDUCATOR

Let us make sure we understand mass and weight are not the same thing.  80 kg of mass is not the same thing as 80 N of weight.  To calculate weight, we use Newton's 2nd Law of Motion, which gives us the formula "Force = mass x acceleration".  We would take the mass given, 80 kg, and multiply it times the acceleration of Earth's downward pull on that mass, 9.8 m/s/s.

784 N = 80 kg x 9.8 m/s/s

So the weight on Earth is 784 newtons.