How do the fundamental forces work?

More mass equals more gravity. Electromagnetism: Anything that has an electric current flowing through it has a tiny magnetic field. Gravity acts as if the universe were a stretchy type of material, and anything with mass has gravity. These things with mass lay on the material and create a slope in the fabric of the cosmos that things will fall down.

This can be concentrated by creating a temporary magnet by winding wire with current flowing through it around an object that can be magnetized. I apologize for the terrible and incomplete response; I don't know much about the other two. Have you researched each force separately?

The four fundamental forces are gravity, electromagnetism, the weak nuclear force, and the strong nuclear force. Gravity acts between all objects with mass, pulling them together. Electromagnetism acts between charged particles, attracting opposite charges and repelling like charges. The weak nuclear force is responsible for certain types of radioactive decay. The strong nuclear force binds protons and neutrons together in atomic nuclei.