Initial Velocity of a Soccer Ball

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Discussion Overview

The discussion revolves around determining the initial velocity of a soccer ball after it is kicked, specifically examining an equation that incorporates the mass of the leg, the velocity of the leg, and the coefficient of restitution. Participants are exploring the factors that influence this velocity, including friction and energy loss.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant seeks clarification on an equation that calculates the initial velocity of a soccer ball after being kicked, referencing specific variables involved.
  • Another participant affirms that the equation indeed represents the initial velocity of the soccer ball.
  • A third participant provides a link to additional resources that may help in understanding the topic further.
  • Another contribution highlights the importance of considering static friction and elastic potential energy, suggesting that these factors could influence the velocity and discussing the impact of gravity on the ball's acceleration.

Areas of Agreement / Disagreement

Participants express varying levels of understanding and focus on different aspects of the problem, indicating that multiple competing views remain regarding the factors affecting the initial velocity of the soccer ball.

Contextual Notes

There are mentions of variables such as static friction and elastic potential energy that are not fully defined or explored, leaving some assumptions and dependencies unresolved.

chapabird
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I am trying to find the initial velocity of a soccer ball ,
but I found this equation and do not understand how it came about:

[PLAIN]http://superforbrain.com/files/vBall.PNG

This is supposed to give you the velocity of the ball right after its kicked, using the mass of your leg, velocity of your leg, and the coefficient of restitution [e].

Any help appreciated!

Thanks
 
Last edited by a moderator:
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Looks like a really cool equation. Yes, it would be the initial velocity of the soccer ball.
 
The variable in velocity that isn’t described is the static friction and elastic potential energy of the two masses. What Joules are lost from the elastic properties of the ball and the direction this force is impacted. If the force is directed up, the acting force would be gravity 9.8 divide by 90=each degree 0.10 m\sec^2. So each degree your ball is incrementally accelerated towards would affect the impacted velocity by 0.10m\sec^2.TM
 

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