Physics week 4

E = mc2 affects us all the time. Whenever we do anything, we release energy, which ever so slightly decreases our mass. It also explains the potential energy of objects. The more mass an object has the more energy it can also release. Think about a really huge body builder trying to move a heavy object, versus a child moving the same object. Obviously, the person with more mass will have the most energy to expend. This is a rather simplistic way to view it though. Its the idea of even immobile seemingly "dead" objects having qi. A table's qi is just more dense than our qi - but it still holds energy. 
The four forces are all interactions between particles. Gravity is the easiest force for us to comprehend - its two objects attraction to one another. The earth has great mass, and so our particles are attracted to it - it keeps us on the ground. Electromagnetism holds particles with a charge together. It's what keeps objects in tact. The strong force is what holds the nucleus of an atom together and the weak force is what is responsible for radioactive decay. Together they account for how our atoms stay together and don't float apart.
The function of gravity is very important. It's what keeps the earth close to the sun, but not plummeting into it (because the earth has its own gravity). It's what keeps us on the earth. It helps us make sense of what is up and down. If we didn't have gravity we wouldn't have life because the earth would either float away from the sun or smash right into it.

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