1. The problem statement, all variables and given/known data The disk in Figure 3.30 of radius R rolls without slipping with constant angular velocity Ω. Carved inside the disk is a slot and a mass moves inside the slot. Denoting the position of the mass inside the slot by s, calculate the velocity and acceleration of the mass as a function of θ. 2. Relevant equations v_A = RΩ v_B = v_A + v_B/A a = dv/dt 3. The attempt at a solution v_A = R*Ω, which is fairly obvious since the disk does not slip. v_B is then = R*Ω + v_B/A Finding v_B/A is where I'm having issues. My first thought is that it would be Ω*√((5R/8)^2+s^2), but this isn't in terms of θ and is only angular velocity. I've thought about trying to relate θ using the relation tan(θ) = 8s/(5R), but I don't know how to fit this into the equation. I haven't taken a look at finding the acceleration yet, but I imagine I could just take the time derivative of the velocity equation to get the acceleration.