Forces

Forces

1. Gravity

   • attractive btw all particles
   • Extremely weak at particle level
   • General Relativity
     • Gravity is a distortion of space-time b/c matter
   • Long Range

2. Electro-Magnetic Force

   • Long Range
   • Force btw charged particles
   • Holds together: atoms, solids, liquids, molecules
   • Magnetic force acts on charged particles in motion

3. Strong Force

   • Short Range 10^-15 m
   • Only acts on nuclear scale (holds together protons/neutrons)
   • Color charge btw particles
   • Holds quarks together to form protons and neutrons

4. Weak Force

   • Short Range 10^-18 m
   • Radio decay Beta +
   • Only force on the particle scale seen by neutrinos