13. APPLICATION | FORCE Un cerf-volant est soumis aux deux forces suivantes. F: une force de 4 newtons avec F₁: une force de 5 newtons avec = = 30°, N.-E.; 135°, S.-E. Représenter graphiquement les forces F, et F, et déterminer la force F qu'il faudrait appliquer à l'objet pour annuler l'effet des forces F, et F.

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