Physics Help Forum rotation

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

 Jun 9th 2015, 11:29 AM #1 Junior Member   Join Date: Jun 2015 Posts: 11 rotation a ball rolls without slipping.The radius of gyration of the ball about an axis passing through the centre of mass is K.If radius of the ball be R,then the fraction of total energy assosciated with its rotational energy will be?
 Jun 9th 2015, 11:47 AM #2 Senior Member   Join Date: Apr 2015 Location: Somerset, England Posts: 995 What have you worked out so far? What sort(s) of energy does the ball possess, assuming it rolls on a horizontal surface (which you should have mentioned).
 Jun 9th 2015, 12:01 PM #3 Junior Member   Join Date: Jun 2015 Posts: 11 the answer comes as k^2 divided by k^2+R^2. how?
 Jun 9th 2015, 12:04 PM #4 Senior Member   Join Date: Apr 2015 Location: Somerset, England Posts: 995 I didn't ask for the answer and I am not going to do your homework for you. But I did ask what should be a helpful question.
 Jun 9th 2015, 12:08 PM #5 Junior Member   Join Date: Jun 2015 Posts: 11 the ball possess rotational and translational energy because it is in a rolling motion.Question seems confusing to me..
 Jun 9th 2015, 12:10 PM #6 Senior Member   Join Date: Apr 2015 Location: Somerset, England Posts: 995 Correct, so the link is the rotational speed which determines both the rotational energy and the translational velocity, which in turn determines the translational energy. And the mass will cancel out when you write the fraction to calculate the % or ratio.
 Jun 9th 2015, 12:13 PM #7 Junior Member   Join Date: Jun 2015 Posts: 11 okay,thankyou!

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