Quarks, leptons, and the four fundamental forces

Video lesson
Protons and neutrons are made of quarksVideo lesson
The electron has no smaller partsInteractive lesson
Fundamental and composite particlesInteractive lesson
Fundamental or composite?Interactive lesson
Quarks come in six flavorsInteractive lesson
Charges of the up and down quarksInteractive lesson
What a proton is made ofVideo lesson
The neutron is uddInteractive lesson
Quark charges add up to the particle's chargeVideo lesson
Quarks are never found aloneInteractive lesson
The electron is a leptonVideo lesson
The neutrino

The four fundamental forces

Interactive lesson
Quark or lepton?Video lesson
Four fundamental forcesInteractive lesson
Gravitational force: acts on mass, unlimited range, weakestInteractive lesson
Electromagnetic force: acts on charge, unlimited range, strongInteractive lesson
Strong nuclear force: acts on quarks, nuclear range, strongestInteractive lesson
Why the nucleus holds togetherInteractive lesson
Weak nuclear force: acts on all matter, nuclear range, weakVideo lesson
The weak force changes particle typesInteractive lesson
Why neutrinos barely interactInteractive lesson
Rank the four forces by strengthInteractive lesson
Classify the four forces by range

The standard model, antimatter, and how we know

Video lesson
The photon carries the electromagnetic forceVideo lesson
Force-carrier bosonsVideo lesson
The gluon carries the strong forceVideo lesson
The W and Z bosons carry the weak forceInteractive lesson
Match each force to its carrier bosonInteractive lesson
The standard modelInteractive lesson
Gravity is missing from the standard modelInteractive lesson
The Higgs bosonInteractive lesson
Place any particle on the standard-model chartInteractive lesson
The positronInteractive lesson
Every particle has an antiparticleVideo lesson
AnnihilationInteractive lesson
Particle acceleratorsInteractive lesson
Why collisions need high energyInteractive lesson
Particle detectorsVideo lesson
Read a track's curve for the charge sign