Pendulums yay?

whn the pendulum is at any point , two forces act 1. mg downwords and the other is tension T(mgcos@) {whr @ is the angle} in the string, now the net force is the resultant of the two forces. increasing length changes the time period. so if u want to compare forces as in after 2 secs of start of motion for both pendulum, obviously @ will be less for a longer string after 2 sec as compared to previous pendulum, n hence the resultant force would be different.