Ball colliding with rod elastically

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Homework Help Overview

The discussion revolves around a problem involving a ball colliding elastically with a rod. Participants express concerns regarding the lack of specific data, such as the mass and speed of the ball, which they believe may be necessary to solve the problem.

Discussion Character

  • Assumption checking, Exploratory

Approaches and Questions Raised

  • Some participants question whether the absence of mass and speed data makes the problem unsolvable. Others suggest making assumptions about these values to explore potential outcomes. There is also mention of focusing on the impulse applied to the rod rather than the specifics of the collision.

Discussion Status

The discussion is active, with participants exploring different interpretations of the problem. Some guidance has been offered regarding the relevance of certain details, indicating a productive direction in the conversation.

Contextual Notes

Participants note the imposed constraints of the problem, particularly the missing information about the ball's mass and speed, which is under discussion. The mention of "instantaneous axis of rotation" also raises questions about understanding specific terminology related to the problem.

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Homework Statement



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The Attempt at a Solution



The problem I am having in this question is that mass and speed of ball is not given . I think it is not possible to solve this question without this data .

Am I correct or is data sufficient in this problem ?

Thanks
 

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Vibhor said:
The problem I am having in this question is that mass and speed of ball is not given . I think it is not possible to solve this question without this data .

Am I correct or is data sufficient in this problem ?

Thanks

Just make something up for the mass and speed of the ball and see what answer you get. Then, try a different mass and/or speed, and see whether you get the same answer.

PS Do you understand what they mean by "instantaneous axis of rotation"?
 
Last edited:
You can save yourself some calculation by ignoring the ball and the statement that the collision is elastic. The important information is that the rod has had an impulse applied at one end at right angles to its long axis. The ball and the rebound speed required to conserve total energy are an irrelevant distraction.
 
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jbriggs444 said:
You can save yourself some calculation by ignoring the ball and the statement that the collision is elastic. The important information is that the rod has had an impulse applied at one end at right angles to its long axis. The ball and the rebound speed required to conserve total energy are an irrelevant distraction.
Thanks a lot :smile:
 

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