Monday, April 11, 2016

Q16 mc discussion

7 comments:

  1. Beacsue clay is usually of greater mass than rubber, I thought the glider would move left since the question involves momentum. Since the equation of momentum is p=mv, I thought the clay ball would cause the gilder to move left.
    -Rayna Patel

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  2. Both attended the same mass one sticks and one bounces. Critical Examples
    Spit ball example/ big fish little fish
    Tennis ball example.

    So if the object bounce the one tracking to the right has a + p. And the one traveling to the left has a -p.
    So if the p was say +5 before it must be + 5 after
    in bouncing. The -p+ +p= 5. That means the +p > 5

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  3. This is another question where I had the correct answer and ended up changing it. I still do not understand the correct choice, though. It says the change in P is greater in the rubber ball than the clay ball. Is it because the rubber ball goes from a momentum, to no momentum, back to its original momentum where the clay ball just goes from its momentum to zero and it ends there? It is just confusing because the rubber ball starts with a momentum and in the final picture it goes back with the same momentum, where the clay ball goes from having a momentum to zero.

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  4. This is another question where I had the correct answer and ended up changing it. I still do not understand the correct choice, though. It says the change in P is greater in the rubber ball than the clay ball. Is it because the rubber ball goes from a momentum, to no momentum, back to its original momentum where the clay ball just goes from its momentum to zero and it ends there? It is just confusing because the rubber ball starts with a momentum and in the final picture it goes back with the same momentum, where the clay ball goes from having a momentum to zero.

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    Replies
    1. you are ignoring the total momentum of the system...

      the question is trying to figure out if you vcan apply the idea of momentum to the system...

      Delete
  5. make up #s to represent the momentum....

    Write the expression for the total momentum of the system. Before and After

    set them equal.
    compare

    ReplyDelete
  6. make up #s to represent the momentum....

    Write the expression for the total momentum of the system. Before and After

    set them equal.
    compare

    ReplyDelete