Notion de force

2 :

En précisant l’échelle utilisée dans chaque cas, représenter les vecteurs forces suivantes :

1. Une force horizontale, orientée de droite à gauche, et de valeur F=18,5 N.

2. La tension exercée par l’extrémité inférieure d’un fil incliné d’un angle de 20° par rapport à la verticale, et de valeur égale à 29 N.

3. La réaction exercée sur un livre par un plan incliné d’un angle de 15° avec le plan horizontal. Dans les conditions de l’étude, cette force est dirigée suivant la verticale et sa valeur est égale à 4,9 N.

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