1. The problem statement, all variables and given/known data http://books.google.com/books?id=uA...ts=4tThicDJOS&sig=d7POqmkxlKMhS72_Rv7oTpMko1o Problem 5.17. 2. Relevant equations Newton's second Law (F = ma) 3. The attempt at a solution I think I can solve the problem, I just can't visualize the system. Would someone draw a picture for me? The next step is to write out newton's laws for the two masses (m * a = sum of forces) and solve the simultaneous second order ODEs. To determine if it is periodic, I simply take the ratio of the two periods. If there is an integer multiple between the two, then it is period.