1. The problem statement, all variables and given/known data 2. Relevant equations radius of gyration: r = root (I/m) I = moment of inertia m = mass parallel axis theorem given above 3. The attempt at a solution Okay, so I think the moment about CM is just m*0.24^2, but after that, I'm less sure. Is the moment about the hip just m*0.42^2 + m*0.24^2? If so, it's taking the acceleration and the distance to the toe into account that I'm having difficulty with. Is it just F = ma? If so, is the m taken from the moment of inertia at the hip, or the toe? I figure the distance to the toe must be significant, but I don't know how to account for it. Any help?