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![[Post New]](/templates/default/images/icon_minipost_new.gif) 6 Feb 2008 22:26:14 IST
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see karthik u are having a confusion on what a normal force is....see this...
http://www.youtube.com/watch?v=l3k7ldqWwN4
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Be Strong Be Different. Just Be
    
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6 Feb 2008 22:41:13 IST
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The collision in which the kinetic energy of the two colliding bodies remain conserved is known as an elastic collision.
For an elastic collision the coefficient of restitution=1
In an elastic collision the two bodies do not stick to each other but remain only in contact for a short period of time. As a result, the velocities of the two colliding bodies is always different before and after collision.
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<TABLE CELLSPACING="1" CELLPADDING="1" BORDER="0">
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<DIV ALIGN="right">Glitter Graphics</DIV></TD></TR></TABLE>
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7 Feb 2008 14:13:19 IST
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in a rolling body,the normal reaction and the displacement may or my not be perpendicular to each other...............
and the kinetic conservation u wer talking about...its not "just before the collision"...its "just before and just after the collision......consider this:
a disc rests on a rough horizontal surface.a particle comes(moving on the surface) and strikes it at its lowestmost point...KE is conserved in this case just before and just after the collision
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