Momentum Change in a Collision with Combined Units

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Discussion Overview

The discussion revolves around the calculation of momentum change in a collision involving two objects that combine into a single unit after the collision. Participants explore the implications of combined momentum and the ability to determine individual momentum changes based on given data.

Discussion Character

  • Technical explanation, Debate/contested

Main Points Raised

  • One participant presents a scenario with initial and final momentum values, questioning the ability to find the change in momentum for the two objects when they combine.
  • Another participant asserts that the total momentum remains consistent at 20 kg-m/s to the left before and after the collision, implying that momentum is conserved.
  • A further inquiry is made about how to find the change in momentum for each object, suggesting that the provided data may be insufficient for this calculation.
  • One participant clarifies that without knowing the masses of the two objects, it is impossible to determine how much of the final momentum is attributed to each object, thus hindering the calculation of individual changes in momentum.

Areas of Agreement / Disagreement

Participants express differing views on the ability to calculate individual momentum changes, with some agreeing on the conservation of total momentum while others highlight the lack of necessary data to resolve individual contributions.

Contextual Notes

The discussion highlights limitations related to missing mass information for the objects involved, which affects the ability to calculate individual momentum changes accurately.

sameeralord
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In this collision


Before= p=100 kg m/s---> <-----p=120 kg m/s
After= <--combined unit P= 20 kg m/s

In this question when I work out the change in momentum for 2 objects it is not the same. When there is a combined unit traveling after the collision can't you find the change in momentum?
 
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What's the problem? The total momentum is 20 kg-m/s to the left both before and after the collision.
 
phyzguy said:
What's the problem? The total momentum is 20 kg-m/s to the left both before and after the collision.

How do you find the change in momentum of each object? Is the data insufficient?
 
I see your question. Unless you know the masses of the two objects, you don't know how much of the final momentum belongs to each object, so you can't calculate the individual changes.
 

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