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Angle between forces, when one force and the resultant force known

ÀÛ¼ºÀÚ Uploader : cassiopeia ÀÛ¼ºÀÏ Upload Date: 2019-10-23º¯°æÀÏ Update Date: 2020-02-29Á¶È¸¼ö View : 901

Given the magnitudes of the resultant force F and the force F1 and the angle ¥á as shown in the figure, the magnitude of the force F2 can be obtained as follows. 

Sum of vertical forces : F1*sin¥á+ F2*sin¥â = 0 

Sum of horizontsl forces : F1*cos¥á+ F2*cos¥â = F 

Vertical force of F2 : F2*sin¥â = - F1*sin¥á 

Horizontal force of F2 : F2*cos¥â = F - F1*cos¥á 

F2 = ((- F1*sin¥á)^2 + (F - F1*cos¥á)^2)^(1/2) 

  = (F1^2*(sin¥á)^2 + F^2 - 2*F*F1*cos¥á + F1^2*(cos¥á)^2)^(1/2) 

  = (F^2 + F1^2 - 2*F*F1*cos¥á)^(1/2) 

Thus, the angle ¥â between the resultant force F and the force F2 is :

sin¥â = - F1*sin¥á/ (F^2 + F1^2 - 2*F*F1*cos¥á)^(1/2)

¥â = arcsin(- F1*sin¥á/ (F^2 + F1^2 - 2*F*F1*cos¥á)^(1/2))

*** Âü°í¹®Çå[References] ***

¥â = arcsin(- F1*sin(¥á)/ (F^2 + F1^2 - 2*F*F1*cos(¥á))^(1/2))
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