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Dec10-12, 01:12 PM
P: 960
Quote Quote by kavan View Post
When you open a door you apply force in any particular direction and as a result you get rotational motion of the door. My question is how linear momentum is conserved in this case
Linear momentum is conserved in a closed system as long as there are no external forces on the system. In the case of a hinged door or rod there is an external force from the hinge.

How did the momentum along the y direction come into picture when originaly there was none?
The force from the hinge has a component in the y direction.