The four forces of nature
• Gravity (Einstein) • Electromagnetism (Maxwell) • Strong force • Weak force The Strong force is responsible for binding protons & neutrons together into nuclei and binding quarks together into protons & neutrons.
The weak force is responsible for certain radioactive decays, such as the beta decay of the neutron.
n ! p + + e " + # e
COSMOS to HUMANITY, Spring 2008
Lecture 2 , slide 18