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