This is a question for the setup of a lab. I understand that the string must be tied to the mass and then spun in an overhead circle. A cylindrical tube with non-sharp edges will be used to spin the mass. Then, the string will be pulled through the mass, which would reduce the radius and consequently cause the velocity to increase. At one point the string would break. Since the radius at which the string broke is known and the time can be found the velocity could be found, provided the acceleration was known. Velocity=acceleration*times. What is the most efficient method to find acceleration? Can I assume there is a constant angular acceleration because it is traveling the same circle in the same amount of time? But will it change because the radius of the circle in smaller? I have a good understanding of F=mv^2/r and F=mw^2r. I also understand that the force of tension is the centripetal force that is acting inward and causing the acceleration. I just don't understand how to collect data to determine what velocity the mass was spinning at when the string broke. Please help!