The Four Fundamental Forces

There are four fundamental forces in the universe that determine how particles interact.

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There's the Strong Nuclear Force, which has the color charge that we looked at before. It interacts with quarks and is what keeps the nucleus of atoms together. 

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We've discussed the Electromagnetic Force, the force that we observe in electricity, magnetism, and light. This study of this force is what led us to our initial understandings of quantum physics.

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Next is the Weak Nuclear Force, the force that causes the radioactive decay of particles. This force is the strangest out of the four forces.

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Finally, we have the Gravitational Force. The gravitational force is the weakest of the four forces and is not part of the standard model.

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Image From: http://hyperphysics.phy-astr.gsu.edu/hbase/Forces/funfor.html#c2

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Don't worry if you don't understand yet. We will go over each force in detail soon.