Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

There is a plank hinged about a point O. At the free end of the plank a small impulse is given. Will the plank perform pure rotation or both rotation and translation?

share|cite|improve this question
how can it translate if it is hinged? Isn't the hinge fixed to a wall or something? Are you talking about the center of mass? How do you push it, sideways, at an angle? Is the hinge in a plane? This question is vague. Generally a free plank will both translate or rotate when pushed, but a hinged plack will only rotate around the hinge. Whether you consider that translation depends on whether you are considering the center of mass motion or the hinge point motion. – Ron Maimon Aug 1 '12 at 8:42
up vote 1 down vote accepted

Both Rotation and Translation. It will execute neither pure rotation nor pure translation

share|cite|improve this answer
While this is formally correct it comes without explanation of how it was arrived at at does not improve on Ron's comment. – dmckee Aug 17 '12 at 14:07

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.