TimeSpaceLightForce Posted March 21, 2015 Share Posted March 21, 2015 J -- -- -- --o||||||o Attached on a 1 unit long and weightless cord are 2 identical balls w/ 1 unit mass.If it slides on hook J w/out friction.. the high ball can be pulled horizontally to distance (d)away from J so that when released it can hit the other ball. Can I assume that the lowball is at rest on time of collision? Link to comment Share on other sites More sharing options...
studiot Posted March 21, 2015 Share Posted March 21, 2015 Is this homework? Can I assume that the lowball is at rest on time of collision? How can it be? Although this is a dynamic question so not an equilibrium one, you can resolve the forces acting on the balls. Link to comment Share on other sites More sharing options...
J.C.MacSwell Posted March 22, 2015 Share Posted March 22, 2015 (edited) Is the ball simply released with the system in a static position? What force would be required to maintain the lower ball at rest prior to collision? Edited March 22, 2015 by J.C.MacSwell Link to comment Share on other sites More sharing options...
studiot Posted March 22, 2015 Share Posted March 22, 2015 (edited) JCMacSwell Is the ball simply released with the system in a static position? What force would be required to maintain the lower ball at rest prior to collision? That mkes no more sense (ie is incomplete) than the OP. Edited March 22, 2015 by studiot Link to comment Share on other sites More sharing options...
swansont Posted March 22, 2015 Share Posted March 22, 2015 Can I assume that the low ball is at rest on time of collision? Under the conditions you've given, yes. 1 Link to comment Share on other sites More sharing options...
studiot Posted March 22, 2015 Share Posted March 22, 2015 (edited) I tried an experiment swansont is correct, it will not move, so long as the masses are equal. +1 Edited March 22, 2015 by studiot Link to comment Share on other sites More sharing options...
TimeSpaceLightForce Posted March 27, 2015 Author Share Posted March 27, 2015 I tried an experiment swansont is correct, it will not move, so long as the masses are equal. +1 thanks.. but the imagine the lower ball moving downward if there is a horizontal tug on the swinging ball. Maybe your experiment has high friction.. Link to comment Share on other sites More sharing options...
TimeSpaceLightForce Posted May 15, 2015 Author Share Posted May 15, 2015 I was directed to almost similar arrangement of this called Swinging Atwood Machine ( also known as smiles & tears). Its a lot complicated than i thought. Below the red circles are pulleys. O -- -- -- --O-- -- --o||||||o Link to comment Share on other sites More sharing options...
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