conceptual concepts on torque according to Hewitt?

Answer 1

I think you are looking for a discussion of torque by Paul Hewitt Conceptual Physics series. (see http://www.conceptualphysics.com/books.shtml (books and videos) ).

A torque is an angular force which can be expressed as
T= r F (vector product) where
T – torque
r - radius
F – force applied at the radius.
or
T=IA where
I is the second moment or moment of inertia
A – angular acceleration