I would not say that. Purely semantically, the sentence is too vague. Physics is an area of study, a specific method of research about one specific aspect of the known universe. It is not a reason, and therefore it is not a reason for anything.
Physics gives you a way to study the goings on of the world. And in turn, gives you predictive power about how an event is likely to proceed. However, it doesn't really give you an (ultimate) reason, since ultimately, physics itself must be based on empirical evidence. A more precise statement might be: "Things happen, apparently according to a set of rules. Physics is the study of such rules."