PHYS 17200 Lecture 4: Fundamental Interactions
12 Mar 2015
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Phys 17200 - modern mechanics - lecture 4_fundamental interactions. The universal, attractive gravitational interaction between any two objects that have mass. The electromagnetic interaction responsible for attractive or repulsive interaction between objects with electric charge. As a consequence of the fact that ordinary matter consists of atoms made of charged protons and electrons, we will find that all of the examples of contact interactions on the preceding slide are fundamentally electromagnetic. The very short-range strong or nuclear interaction that acts only between objects made of quarks like protons and neutrons. It is this strong interaction that holds atomic nuclei together inspite of the repulsive electric forces protons exert on each other. The very short-range weak interaction that acts between all kinds of elementary particles. F_grav_on2by1 = (-gm1m2/(r_mag)^2)*r_unit r_unit points from object being attracted to object which is attracting. F_grav = mg ; g = 9. 81 ms^-2 g = (-g*mass_earth/(r_earth)^2)*r_unit.
