Apple QuickTime movie | 1995-06-06 | 5.3 MB | 512x276 | 30fps | 1 minute, 27 seconds
Transcription: we see such a variety of forces that it may seem hopeless to try and organize them. Nevertheless, physicists have been able to show that all the known effects in the universe are the result of these four basic forces. Gravity, electromagnetism, the attraction and repulsion of electrically charged bodies, the subatomic weak force, the strong force holding the atomic nucleus together. By the way, the only one of the basic forces you've ever felt is electromagnetism. When you push the wall and it pushes back, you're feeling electric repulsion between atoms. You've never felt gravity, only the ele ...
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