having my brain fried with some dynamics problems for uni and my lecturer is on holiday so I dont have anyone to ask. Currently working on un-dampned vibration and simple harmonic motion and I can work out basic questions such as a weight hanging on a spring but when it starts to involve rotation as well I just cant seem to get my head round it. this is the type of question I mean: any help with this would be greatly appreciated! EDIT: is there any way of simplifying the problem in a similar way to parralell/seris spring problems? or is this too simple a problem to simplify!?! ive been trying to rething th problem as a massless wheel of radius L with a tangental downards force (forcing the wheel clockwise) of WL Sin (theta) and a tangental upwards force (anti-clockwise) of Ka Sin(theta) am I making fundametal/retarded misstakes or is this the completely wrong way to go about it?