Resulting force on the string during a stroke with two different finger-bow interactions. The mechanical properties of the bow and the distances of the fingers to the pivot point are assumed to be as follows: m_bow = 60 g, x_CM = 20 cm, x_I = 6.3 cm, x_L = 5.6 cm. (a) Resulting force on the string when the index and little finger forces are null. (b) Finger forces required to obtain a uniform force on the string of 1 N, as presented in equation (3).