The Four Forces

Strong, electromagnetic, weak, gravity

An interactive lesson with 6 steps, about 5 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• Four forces: strong, electromagnetic, weak and gravity, in decreasing strength.
• Gravity dominates large scales because it always attracts and never cancels.
• Forces are carried by exchanged particles: gluons, photons, W and Z.

Steps

1. Four fundamental forces
2. The weakest wins
3. Electric versus gravity
4. Messenger particles
5. Which force wins?
6. Range from mass