Before we had technology, the original method to calculate the mass of astronomical objects like Earth or the moon, was a stick and a string. Here's how this works:
kilograms. That is such an enormous mass that it's difficult to comprehend. And if it's so difficult for us to even imagine numbers that large, how would we go about finding those values? Well, the original method was to use some small masses, a stick, and a string. Yes, this is one of the important steps in determining masses of both the sun and all the planets in our solar system. It's called the Cavendish experiment—. It's really cool, so I'm going to explain how it works.
So, just step back for a moment. When we measure stuff, we always have to make some type of choice. If we want to have a mass in kilograms, then we have to decide how to specify the value of 1 kg. One way would be to say that a kilogram is the mass of 1 liter of water. Of course, that's not the best definition . OK, what about measuring force? We use a unit called the Newton where 1 Newton is the force required to accelerate 1 kilogram at 1 meter per second per second.
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