1. The problem statement, all variables and given/known data http://online.physics.uiuc.edu/cgi/courses/shell/common/showme.pl?courses/phys211/oldexams/exam3/fa08/fig10.gif [Broken] A spool of mass M = 1 kg sits on a frictionless horizontal surface. A thread wound around the spool is pulled with a force T = 4 N as shown below. The total moment of inertia about the center of mass of the spool is I = 0.8 kg·m2, its outer radius is R = 1 m and its inner radius is r = 0.5 m. The spool starts from rest. When the center-of-mass of the spool has traveled 2 m, the net work done on the spool is 8 J. (True/False Question) 2. Relevant equations 3. The attempt at a solution I simply thought the net work done here is only by the tension force.. And i vaguely remember that the force given to the center of mass or the outer part of the edge would have the same acceleration "Acm".(Not sure if it's correct) So i used the given tension 4N and into 2 meters which gives me 8J. But it turns out that the answer is FALSE... What's wrong in my thought? Could someone help me out here....?