I am trying my level best to give this screwdriver a horizontal push only, but it is going in a circular path. I thought of uneven friction due to non-uniform normal reaction...what do you think? I have read up torque a bit, but I dont have a clear understanding of it..does it have anything to do here?
here is the video: https://docs.google.com/file/d/0BzGx6LKK8aWkU2pYaGJMdFZZZkk/edit?usp=sharing
if the above doesn't work: http://www.youtube.com/watch?v=B21BBV0PUXo&feature=youtu.be