A force is an external agent which changes or tends to change the behavior of any solid body. It is a vector quantity since it is designated with magnitude and direction. The forces may be of tensile or compressive in nature. Copy the link given below and paste it in new browser window to get more information on Resultant of Two Unlike and Unequal Parallel Forces:- http://www.transtutors.com/homework-help/mechanical-engineering/force-systems-and-analysis/resultant-of-two-unlike-and-unequal-parallel-forces.aspx