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Lecture 2 - The current state of fundamental physics - page 18 / 27

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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.

anti-neutrino

n ! p + + e " + # e

David Kastor

COSMOS to HUMANITY, Spring 2008

Lecture 2 , slide 18

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