Cylinder hitting inclined plane

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TSny
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If you have a block resting on a table, the normal force will balance the weight. But if you apply a little upward force to the block (not enough to lift it off the table) the normal force will decrease. The net vertical force on the block remains zero.

Similarly, in the 90 degree wall case, the upward friction from the wall might not be enough to lift the cylinder off the table. The net vertical impulse NΔt + fΔt - mgΔt could be zero.

But, if fΔt > mgΔt the net vertical impulse is clearly nonzero and the cylinder will have some vertical linear momentum after the collision.
 
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Thank you very much TSny .Thanks haruspex .
 

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