Energy, Matter and the Four Forces

E=mc2 affected me when I trained boxing today. My sparing partner that weighs more than me, that have more mass than me, can deliver a punch with more force and more energy. There is a clear correlation between mass and energy. In Einstein's equation, the speed of light is a constant. Yet in my boxing training, the speed is not constant. Therefore I use my quick speed as an advantage when sparing. My ability to move around the ring and deliver punches with high speed and unexpectedly makes up for my disadvantage in mass, enabling me to have an energy to match my sparing partner. 

I find the four forces interesting in that the affect of gravity is more acknowledged than the others, yet the other three also have an affect. I find electromagnetism fascinating and think that we don't acknowledge that force enough. Gravity is attractive, whereas electromagnetism comes in two charges, positive and negative. Electromagnetism has both attractive and repulsive properties that can combine or cancel each other out. I wonder how electromagnetism can be applied to energy between people, how two people can have an electromagnetic combination and be attracted or repelled by each other based on the energy that those two people have.

The function of gravity is to give explanation for why masses move towards each other. I think about the gravity on Earth, and how our understanding of gravity enables us to make predictions that affect our everyday lives. For example, we can estimate that a full grocery bag will require muscle strength to carry because of the pull of Earth's gravity; we can throw a basketball up in the air towards a hoop based on a projection of how gravity will make the ball come down (hopefully for the Warriors, into the basket!); we can use a crane on a construction site and know that gravity will have a pull on the steel being lifted and ensure that the tension cord is of a certain strength to counter gravity's force on the mass of the object. An understanding of gravity is applicable in our everyday lives.