Collision of Two Objects on Ice

  • Context: High School 
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Discussion Overview

The discussion revolves around the physics of collisions, specifically focusing on how much an object must weigh to remain stationary when struck by a hockey puck of varying speeds on a smooth ice surface. The context includes considerations of friction and impulse in the scenario.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant queries the weight required for an object to remain stationary when hit by a 6oz puck at different speeds (100mph, 75mph, 50mph, and 25mph).
  • Another participant suggests that the problem requires empirical data collection, particularly regarding the coefficient of friction between the object and the ice.
  • It is noted that static friction may vary based on how long the object has been on the ice, complicating the calculations.
  • A suggestion is made that using a rubber or cloth band around the object could help distribute the force over a longer duration, potentially aiding in keeping the object stationary.
  • Some participants express a lack of knowledge in the field, indicating that they are seeking practical applications for youth hockey coaching.

Areas of Agreement / Disagreement

Participants do not reach a consensus on a definitive solution to the problem. There are multiple perspectives on the factors influencing the outcome, particularly regarding friction and the nature of the collision.

Contextual Notes

The discussion highlights the need for specific measurements and empirical testing to address the problem accurately, indicating that theoretical approaches may not suffice.

JMS10
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hi, I apologize if this question is placed in the wrong area. I was not sure where it belonged. Can someone please help me with the following:

Assuming the ice is very smooth, like that of your standard indoor hockey arena, how much much would an object have to weigh to remain stationary when hit with a 6oz puck traveling 100mph? 75mph? 50mph? and 25mph?

I don't know if it matters, but the object being struck would smooth on the surface that touches the ice, and would be 72 inches wide, 4 inches deep, and 4 inches tall.

Thank you in advance for any and all help you're able to provide! I appreciate you taking the time!
 
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JMS10 said:
hi, I apologize if this question is placed in the wrong area. I was not sure where it belonged. Can someone please help me with the following:

Assuming the ice is very smooth, like that of your standard indoor hockey arena, how much much would an object have to weigh to remain stationary when hit with a 6oz puck traveling 100mph? 75mph? 50mph? and 25mph?

I don't know if it matters, but the object being struck would smooth on the surface that touches the ice, and would be 72 inches wide, 4 inches deep, and 4 inches tall.

Thank you in advance for any and all help you're able to provide! I appreciate you taking the time!
What conservation laws are you aware of that might be appropriate?
 
None! Sorry, but I am clueless in this field. I am a youth hockey coach trying to create a tool to use in a drill to help develop young players.
 
JMS10 said:
None! Sorry, but I am clueless in this field. I am a youth hockey coach trying to create a tool to use in a drill to help develop young players.

Your problem can only be solved by gathering some data from your set-up and then you can apply some physics. The main factor is how much your object will grip the ice (this is called the coefficient of friction). There is no theorectical way to determine this. You would have to measure this quantity - in the same way that you have to measure the weight of your object and the weight of the puck.
 
JMS10 said:
Assuming the ice is very smooth, like that of your standard indoor hockey arena, how much much would an object have to weigh to remain stationary when hit with a 6oz puck traveling 100mph? 75mph? 50mph? and 25mph?
Friction on ice is complicated, and the static friction might even depend on how long the object was standing on the ice. The max force in collision is also not easy to determine accurately. So as others said, you have to try it out.
 
One thing that should improve your chances of its staying put is to have a rubber or cloth band around it. That will spread the impulse over a longer period, reducing the peak force.
 

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