Momentum of falling mass problem

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Homework Help Overview

The problem involves a collision between a horizontally traveling object and a hanging metal plate, focusing on the conservation of momentum. The original poster is attempting to determine the speed of the plate after the collision.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the application of momentum conservation and question the correctness of the original poster's calculations. One participant suggests considering the coefficient of restitution, while another emphasizes the need to account for the direction of momentum.

Discussion Status

The discussion is ongoing, with participants exploring different interpretations of the momentum conservation principle. Some guidance has been offered regarding the calculation of initial momentum and the consideration of direction, but no consensus has been reached on the correct approach.

Contextual Notes

There appears to be confusion regarding the application of momentum conservation and the potential influence of external factors, such as friction or resistance, which may not have been fully defined in the problem statement.

rachael
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6 An object of mass 0.80 kg traveling horizontally with a
speed of 30 m s–1 hits a hanging metal plate of mass
12.0 kg and rebounds with a speed of 16 m s–1. What is
the speed with which the plate moves forward?

i used p=mu+mu but the answer was not correct why is that?
 
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rachael said:
6 An object of mass 0.80 kg traveling horizontally with a
speed of 30 m s–1 hits a hanging metal plate of mass
12.0 kg and rebounds with a speed of 16 m s–1. What is
the speed with which the plate moves forward?

i used p=mu+mu but the answer was not correct why is that?

Did you try (0.8*30) - (0.8*(-16)) = 12v ? If you did, and that didn't work, maybe there is a coefficient of resistuation (sorry about the spelling) between the object and the plate, so [tex]\frac{Speed.of.sparation}{Speed.of.approach} = e[/tex]
 
Find the total momementum of the system before the collision. This momentum must remain constant. You can calculate the momentum of the object, but remember this is traveling in the oppoisite direction to the plate so:
[tex]P_{plate} - P_{object} = P_{initial}[/tex]
 
thank you ...
 

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