L?
??
40mm
F
L?
30mm
??
30mm
R
3. A mechanical sliding mechanism is designed for two arms to move the roller at point C along the ground. A force
F = 100 N is applied at the connecting link. The long arm OA has length $l_1 = 50 \text{ mm}$ and the short arm has length
$l_2 = 42.43 \text{ mm}$. A restoring force, R, is applied to prevent the system from accelerating
a. What angle, $\theta_1$, would the restoring force be R = 0?
b. When the system is in the given configuration above, what is the restoring force R?