1. The problem statement, all variables and given/known data A yoyo of mass m=2 kg and moment of inertia ICM=0.0625 kg m2 consists of two solid disks of radius R=0.25 m, connected by a central spindle of radius r=0.1875 m and negligible mass. A light string is coiled around the central spindle. The yoyo is placed upright on a flat rough surface and the string is pulled with a horizontal force F=28 N, and the yoyo rolls without slipping. The force is applied at the top of the spindle; so above the center of mass. Find the acceleration of the yo-yo. Find the frictional force 2. Relevant equations F-fr=ma Tq=I*alpha 3. The attempt at a solution I started taking moments about the centre of mass, which came to R*fr - r*F = Torque Then equated this with the Inertia and alpha. R*fr - r*F = I*alpha Then changed alpha to a/R. So ended up with a = ((R*fr - r*F)*R)/I I then use the F-fr=ma equation to solve for both fr and a. The answers i get are incorrect.