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# OCR Breadth - Need help with a question! watch

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1. Hi, I was wondering if anyone could help me with the following question:

http://i.imgur.com/qwYHCwA.png

For some reason the things on the mark scheme were never taught to us and I never came across it in my textbook, so if you could explain it or link me some material to study that would be amazing! =)

2. Can't give you the direct answer sorry
I can help tho.

Momentum.

Sum of moments in left direction = Sum of moments in right direction.

What is the horizontal momentum? Is the water moving left or right before it hits the floor?
3. That's part of the new specification sadly, what's on the markscheme is often not in any textbook, it's so much about application of knowledge. As you're just looking for an explanation, this is to do with the conservation of momentum. The overall momentum in this system has to be constant and I believe the way they word it is that "if one drop were to go in one direction, it must be paired by another going in the opposite direction" or something along those lines. As momentum is a vector quantity, the direction part is important when thinking about it being conserved.
Another example I've seen is for a grenade exploding, same principle as the fragments must conserve momentum as a whole and do the same as this water situation.
4. Thanks to all of you . That makes perfect sense now! I just needed to be thinking about conservation of momentum and it all clicks!
5. (Original post by gedr)
Thanks to all of you . That makes perfect sense now! I just needed to be thinking about conservation of momentum and it all clicks!
+1 rep for you for being a good student in asking questions.

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