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- Thread starter YMMMA
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- #2

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This is a 2d collision that conserves momentum. Make this the basis of your explanation. Is E consistent with momentum conservation?## Homework Statement

in the attached file

## Homework Equations

Momemtum = mass - velocity

## The Attempt at a Solution

I solved it E. Since object 2 has the larger mass, the effect is less and will move backwards a little bit.

- #3

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I am not sure. But no It should have y and x components , I guess.This is a 2d collision that conserves momentum. Make this the basis of your explanation. Is E consistent with momentum conservation?

- #4

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You guess correctly. The total initial momentum has x and y components, therefore the total final momentum must have x and y components. You need to reconsider your answer.I am not sure. But no It should have y and x components , I guess.

- #5

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I think it is C. Object 2 is having a y component and is pushed horizontally to the first quadrant. Object 1 is having an x component and is pushed vertically to the fourth quadrant. I am a little bit unsure since I don’t know how to right the momentum in the y.

- #6

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1. The total initial momentum is ____________ (positive/negative/zero) in the x-direction and ____________ (positive/negative/zero) in the y-direction.

2. Therefore the total final momentum must be

____________ (positive/negative/zero) in the x-direction and ____________ (positive/negative/zero) in the y-direction.

3. The choice that is consistent with (2) is _________ .

4a. Choice _____ is inconsistent because the total final momentum is supposedly

____________ (positive/negative/zero) in the x-direction and ____________ (positive/negative/zero) in the y-direction.

4b. Choice _____ is inconsistent because the total final momentum is supposedly

____________ (positive/negative/zero) in the x-direction and ____________ (positive/negative/zero) in the y-direction.

4c. Choice _____ is inconsistent because the total final momentum is supposedly

____________ (positive/negative/zero) in the x-direction and ____________ (positive/negative/zero) in the y-direction.

4d. Choice _____ is inconsistent because the total final momentum is supposedly

____________ (positive/negative/zero) in the x-direction and ____________ (positive/negative/zero) in the y-direction.

- #7

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The total momentum is thevector sumof the momenta of the two balls. You don't have to write equations, but you need to be systematic. Not only you have to find the right answer, but also you have to exclude the others as incorrect. Fill in the blanks.

1. The total initial momentum is ____________ (positive/negative/zero) in the x-direction and ____________ (positive/negative/zero) in the y-direction.

2. Therefore the total final momentum must be

____________ (positive/negative/zero) in the x-direction and ____________ (positive/negative/zero) in the y-direction.

3. The choice that is consistent with (2) is ____C_____ .

4a. Choice _____ is inconsistent because the total final momentum is supposedly

____________ (positive/negative/zero) in the x-direction and ____________ (positive/negative/zero) in the y-direction.

4b. Choice _____ is inconsistent because the total final momentum is supposedly

____________ (positive/negative/zero) in the x-direction and ____________ (positive/negative/zero) in the y-direction.

4c. Choice _____ is inconsistent because the total final momentum is supposedly

____________ (positive/negative/zero) in the x-direction and ____________ (positive/negative/zero) in the y-direction.

4d. Choice _____ is inconsistent because the total final momentum is supposedly

____________ (positive/negative/zero) in the x-direction and ____________ (positive/negative/zero) in the y-direction.

That was hard, but helpful. Although I am still not sure. Can’t proceed before making sure I am correct, because basically they are all the same and the rest of the choices..

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- #9

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I think it is 2. Is it like vector addition?must bethe samebefore and after the collision. Two vectors are the same if and only if they have the same magnitude and point in the same direction. In (1) you say that the total momentum before the collision points to the left (negative) and up (positive). In (2) you say that the total momentum after the collision points to the right (positive) and down (negative). These two do not point in the same direction, therefore they are not the same before and after the collision, therefore your answers in (1) and (2) are inconsistent with momentum conservation. You need to reconsider. Hint: One of the answers, (1) or (2), is correct but the other is not. Which one?

- #10

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(2) is what? Correct or incorrect? Yes, it is exactly like vector addition. As I indicated in post #6,I think it is 2. Is it like vector addition?

The total momentum is thevector sumof the momenta of the two balls.

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2 is the right one. Yes, sorry did not concentrate.(2) is what? Correct or incorrect? Yes, it is exactly like vector addition. As I indicated in post #6,

- #12

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All blanks are the same as 2. Choices ABDE except CThe total momentum is thevector sumof the momenta of the two balls. You don't have to write equations, but you need to be systematic. Not only you have to find the right answer, but also you have to exclude the others as incorrect. Fill in the blanks.

1. The total initial momentum is ____________ (positive/negative/zero) in the x-direction and ____________ (positive/negative/zero) in the y-direction.

2. Therefore the total final momentum must be

____________ (positive/negative/zero) in the x-direction and ____________ (positive/negative/zero) in the y-direction.

3. The choice that is consistent with (2) is ____C_____ .

4a. Choice _____ is inconsistent because the total final momentum is supposedly

____________ (positive/negative/zero) in the x-direction and ____________ (positive/negative/zero) in the y-direction.

4b. Choice _____ is inconsistent because the total final momentum is supposedly

____________ (positive/negative/zero) in the x-direction and ____________ (positive/negative/zero) in the y-direction.

4c. Choice _____ is inconsistent because the total final momentum is supposedly

____________ (positive/negative/zero) in the x-direction and ____________ (positive/negative/zero) in the y-direction.

4d. Choice _____ is inconsistent because the total final momentum is supposedly

____________ (positive/negative/zero) in the x-direction and ____________ (positive/negative/zero) in the y-direction.

- #13

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OK. I think you got it.

- #14

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Thank you for your help and time!OK. I think you got it.

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