Are all forces illusions?

What is a force ? Is gravity a "real" force ? And what is the origin of contact forces ? All these answers in 14 minutes !

0:00 - Introduction
2:00 - Inertial forces
4:12 - Gravity
7:57 - Contact forces
8:56 - Fundamental interactions
11:52 - Conclusion

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Alessandro Roussel,
For more info: http://www.alessandroroussel.com/en

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To learn more :
https://en.wikipedia.org/wiki/Force