Forces en mécanique : gravité, élasticité, frottement, loi de la gravitation universelle.

Forces en mécanique : gravité, élasticité, frottement, gravitation universelle

Leçon 4 : lois de Newton. Forces : poids $P=mg$ , élasticité $F=kx$ , frottement $F_{fr}=\mu N$ , gravitation $F=G\frac{m_1 m_2}{r^2}$ .

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