We are trying to do the following experiment: http://farside.ph.utexas.edu/teaching/301/lectures/node90.html.
At the moment, here is the experimental setup:
We have a rod 0.4 m long which rotates about 0.1 m from from one end and we have attached a mass at the longer end of the rod from the axis.
So, what we are basically trying out is to measure the minimum velocity required to be provided to the mass while it is resting at the bottom so that the rod completes a full circle, rather "loop the loop".
However,here are some of our objections:
- We found the expression of initial velocity required to "loop the loop" and it was independent of mass (not really surprising). It was the same expression that was given in the website mentioned above. But in their case the rod was massless. Practically that is never possible.
So what we thought was, instead of attaching an additional mass(bob), why can't we use the rod without the mass(bob)?
(since it has a mass of its own) To resolve this issue what we did was the following:
- What are we losing out on if we place the rod so that it rotates about the center of rotation at a point 0.1 m from the end of the rod instead of the center of rotation being the end of the rod?