- #1
dowjonez
- 22
- 0
Q. use d'alemberts principal to find the condition of static equilibrium
so
i prolly want to look at the coordinates of the system with respect to theta
x = L sin Theta where L is the length of the string
y = - L cos theta
(Fapplied - Finertial) delta r = 0
Im guessing the F applied is both the horizontal force and the force of gravity
and that the inertial force is m * L * theta (double dot)
delta r = L * delta theta
so I am just wildly guessing that
(Fapplied - Finertial) delta r = 0
(Fsin theta + mg cos theta - m * L * theta (double dot) ) delta r = 0
i know I am wrong but maybe someone can tell me what I am doing wrong