Conditions d'équilibre d'un solide soumis à deux forces

Si un corns est en équilibre sous l'action de deux forces $$\overrightarrow{F_{1}}$$ et $$\overrightarrow{F_{2}}$$, alors :

(1) $$\overrightarrow{F_{1}}+\overrightarrow{F_{2}}=\overrightarrow{0}$$

(2) $$\vec{F}_{1}$$ et $$\overrightarrow{F_{2}}$$ ont même droit d'action.

Doc 1. Solide très léger en équilibre sous l'action in? forces : $$\overrightarrow{F_{1}}$$ et $$\overrightarrow{F_{2}}$$

image/svg+xml Remarque

La condition est responsable de l'immobilité du centre d'inertie $$G$$.

La condition est celle de l'absence de rotation autour de $$G$$.

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