The problem involves a rod that is hinged and can freely rotate, with an object attached to its end. The scenario describes the object being raised vertically and then released, prompting a discussion on calculating the time it takes to reach the minimum point after a slight disturbance.
Some participants have provided guidance on the limitations of energy methods for this problem and noted the importance of the small angle approximation in simple harmonic motion. Others have suggested using Newton's second law to derive the equations of motion, although they acknowledge the complexity of the resulting equations.
Participants are navigating the constraints of the problem, particularly the assumption of small amplitude vibrations which may not apply in this case. There is an emphasis on the requirement for initial personal effort before receiving assistance, as per forum rules.
The legend said:Try drawing it out yourself and post it here... as per PF rules you got to do something on your own before you get any help.
vela said:Since you're looking for a time, energy methods generally aren't very helpful. Also, for a pendulum, simple harmonic motion follows from the assumption of small amplitude vibrations — in other words, when θ is small. In this problem, that assumption doesn't hold.