Rotation - collision with an obstacle

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cupid.callin
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Homework Statement


Physics problem: a cube of side a moves right with velocity v on a smooth horizontal plane toward a ridge at point O; answer options A to D: 3v/(4a), 3v/(2a), √3v/(√2a), zero. Small diagram shows the block and ridge.



The Attempt at a Solution



First i thought i could apply conservation of momentum about O

but about O ... mg has a torque ... now what to do ?
 
Attachments
  • Physics problem text: a cubical block of side a moves with velocity v on a horizontal smooth plane and hits a ridge at point O, with multiple-choice options (A) 3v/(4a), (B) 3v/(2a), (C) √3v/(√2a), (D) zero, and a small diagram of the block with arrow v and a point O on the ground.
    01280.jpg
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Discussion

hi cupid.callin! :smile:
cupid.callin said:
but about O ... mg has a torque ...

but not an impulsive torque :wink:
 

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