These are the pre lab tasks for my upcoming lab. Find the theoretical value for moment of inertia for a ring with off axis rotation using parallel axis theorem and outline procedure to obtain experimental value of I.
During the lab we will be using a rotating platter with a disc of known weight and radius on the bottom. It will be spun and we will drop a ring of known weight and radii on top with the inner radius touching the axle about which everything is being rotated. So the lower disc will be spinning about centre and ring will be spinning off axis. There will be a computer measurement of angular velocity before and after ring has been dropped onto disk.
Iparallel = Icm + m d2
L = I ω
The Attempt at a Solution
The formula I found for theoretical value for moment of inertia is I = Idisc + ( Iring + m (inner radius)2)
Where I'm at a loss is how to experimentally find a value for the moment of inertia of the ring. My first attempt was to use angular momentum (L = I ω) thinking it would be conserved but looking a the equations, having different theoretical values for I tells me thats not the case. We have not touched on this in class and I'm unsure of what direction to go.
Any help at all with some guidance and equations to use is greatly appreciated I've just feel like I've hit a brick wall.