According to reid, we could trust our notions about the physical world because:

Because "it made common sense to do so".

In philosophy of mind, Reid is most commended today for the contentions he gave in help of the position known as direct realism, which, at its most fundamental, expresses that the essential objects of sense observation are physical articles, not thoughts in human personalities. Be that as it may, Reid's logic of mind neither starts nor closes with perception. 

answer; collective security;

answer; fulfilling a goal of the president's council of physical fitness and sports;