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fundamental forces

The Four Interactions
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The Four Interactions

Four fundamental forces rule the universe. Two of these — gravity and electromagnetism — we know well. The strong and weak force do their vital work on the scale of atoms.

Get to know the fundamental forces and you'll understand how objects can move each other around without touching, and why your butt doesn't fall though your chair.

Lawrence Berkeley National Laboratory
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Gravity Simulator

Gravity Simulator

In this game, stars, planets, and asteroids are your toys. Fling them into space. Watch gravity pull them into orbit around each other. And save the fantastic patterns you make. More...

Game
TestTubeGames
Electromagnetism: Magnetic Force

Electromagnetism: Magnetic Force

If electrostatic force and magnetic force are two parts of the same overall force — electromagnetism — then each should be able to produce the other, right? In fact, each can. More...

Video
SciShow
Strong Interaction

Strong Interaction

How does the strong nuclear force work? And why is it important? Well, for starters, this force holds the nucleus of atoms together so that all of the particles don't just drift away. More...

Video
SciShow
Weak Interaction

Weak Interaction

The weak force isn't as weak as it sounds — it's just that it acts over really small distances. It's able to change the identity of particles when they come very, very, very close to each other. More...

Video
SciShow
Electromagnetism: Electrostatic Force

Electromagnetism: Electrostatic Force

It's the force responsible for balloons sticking to your sweater, and lightning. Electrostatic force is produced as atoms lose and gain electrons. More...

Video
SciShow
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Faraday’s Electromagnetic Lab

Faraday’s Electromagnetic Lab

By playing with virtual magnets, as well as a virtual generator, compass, and transformer, you can see how electricity and magnetism work together. More...

Interactive
PhET
Michio Kaku on the 4 Forces of Nature

Michio Kaku on the 4 Forces of Nature

You want to understand a piano. So you throw one down some stairs and analyze the sounds it makes. Could that be roughly how scientists have come up with the standard model of particle physics?

More...

Video
Science Channel

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