What does gravitational Force mean?

June 21, 2020

When we ask "how strong is this force?" what we mean in this context is "How much stuff do I need to get a significant amount of force?" Richard Feynman summarized this the best in comparing the strength of gravity - which is generated by the entire mass of the Earth - versus a relatively tiny amount of electric charge:

And all matter is a mixture of positive protons and negative electrons which are attracting and repelling with this great force. So perfect is the balance however, that when you stand near someone else you don't feel any force at all. If there were even a little bit of unbalance you would know it. If you were standing at arm's length from someone and each of you had one percent more electrons than protons, the repelling force would be incredible. How great? Enough to lift the Empire State building? No! To lift Mount Everest? No! The repulsion would be enough to lift a "weight" equal to that of the entire earth!

Another way to think about it is this: a proton has both charge and mass. If I hold another proton a centimeter away, how strong is the gravitational attraction? It's about \$10^{-57}\$ newtons. How strong is the electric repulsion? It's about \$10^{-24}\$ newtons. How much stronger is the electric force than the gravitational? We find that it's \$10^{33}\$ times stronger, as in 1, 000, 000, 000, 000, 000, 000, 000, 000, 000, 000, 000 times more powerful!

Source: physics.stackexchange.com
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