rotation
i hve one conceptual doubt
case-1 we hve a rod in a horinzontal plane and a bullet comes and strike it as some point...in these cases we apply momentum conservation the linear one,about the point of collision
case2- we hve a rod which is not hinged and it is rotating with w about com and again one bullet strikes it at some point..Now here when we conserve linear momentum we conserve it about the com unlike in fixed axis rotation..why is this so?
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@Gyro Gearloose
Note for OP
+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.one reason im able to think of is that in fixed axis rotation..there could be some force of the hinge due to the impulse from bullet so we cannot conserve momentum of whole sys
In case 1, is the rod hinged?
sorry i forgot to mention
yes it is
Haan, then the hinge exerts some force on the rod
Think of it this way: If the hinge was not there the rod would have some linear momentum right?
But the hinge stop it from moving and "converts" some of this to rotational momentum
if the rod was initially at rest then some part of kinetic energy of bullet got converted into rotational kE?
and ofc some energy would be lost in collision
Yes correct
Oky
+solved @Real potato
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