Subject: What is the difference between need and drive?

From what i have read i have come to beleive that need indicates the 
physiological need and drive indicates the corresponding psycological state.This 
differentiation of need and drive suits such basic primary needs such as 
hunger,thirst.But iam not able to understand how this applies to the social 
needs such as need for affliation, need for power and need for acheivement.Can 
we use need and drive interchangebly in case of social needs?Please clarify.

Re: What is the difference between need and drive?