Angular momentum and linear momentum

I have read everywhere that they are independent of each other

but what if i throw a ball at a half open door.. the ball would hit the door and the door would rotate.. in this case the ball would lose some momentum and the door gains some angular momentum!.. so aren't they convertible?!

Question

Angular momentum and linear momentum 

I have read everywhere that they are independent of each other

but what if i throw a ball at a half open door.. the ball would hit the door and the door would rotate.. in this case the ball would lose some momentum and the door gains some angular momentum!.. so aren't they convertible?!

anonymous · Answer

yes,but still independent

anonymous · Answer

Yes i get it now... 

we could think that the linear motion of the ball got converted into the rotational motion of the door.. however.. it would be very difficult to look at it that way cause.. it depends on where the ball hits the door.. if very near hinge.. the rotation caused will be less and if far away from the hinge. the rotation caused will be more.. .. Thus.. we in general say that the ball HAD A ROTATIONAL motion associated with it too... (even though it wasn't really rotating).. 

I hope thats how we look at it!!

anonymous · Answer

Of course they're convertible. Here's a conversion of angular momentum to linear: http://science.discovery.com/tv-shows/punkin-chunkin/videos/punkin-chunkin-centrifugal.htm

anonymous · Answer

But i had mean't. in terms of EQUATIONS.. we never use conservation of linear and angular momentum TOGETHER.. .. we have conservation of linear.. seperate and angular seperate.. BUT I got it :)