...with situations like this, I donít know if I would have had the strength...
I'd like to know why 'strength' is used in this sentence instead of 'force'. how to distinguish when to use each one, please?
strength = the quality or state of being strong, physically, emotionally or intellectually.
force = energy as an attribute of action or movement
With reference to the [part] sentence you have given, the context makes it clear that strength of mind or emotions is required to cope with events. There is no physical exertion implied.