Ping Pong ball through a bowling ball

  • Context: Undergrad 
  • Thread starter Thread starter DrSammyD
  • Start date Start date
  • Tags Tags
    Ball Bowling
Click For Summary

Discussion Overview

The discussion revolves around the theoretical exploration of the conditions under which a ping pong ball could pass through a bowling ball without being significantly damaged. Participants are considering aspects of soft body physics, momentum conservation, and energy transfer during impact.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant inquires about the necessary speed for a ping pong ball to pass through a bowling ball and whether there exists a speed that would prevent the ping pong ball from being destroyed.
  • Another participant argues that momentum conservation would slow the ping pong ball upon impact, suggesting that deformation would occur, making it unlikely for the ping pong ball to remain unscathed.
  • A different viewpoint is presented using an analogy of a karate expert punching through bricks, proposing that there is a threshold speed where the energy is effectively transferred, preventing injury to the hand.
  • Another participant challenges the simplicity of the karate analogy, asserting that more complex factors are involved in such scenarios and emphasizing the need for rigorous application of physics principles.

Areas of Agreement / Disagreement

Participants express differing views on the feasibility of a ping pong ball passing through a bowling ball without damage. There is no consensus on the conditions or mechanics involved, indicating an unresolved discussion.

Contextual Notes

Participants have not fully explored the assumptions regarding material properties, impact dynamics, and the specific definitions of "penetration" and "damage." The discussion remains open to various interpretations of the physics involved.

DrSammyD
Messages
21
Reaction score
0
What information would I need in order to calculate the speed necessary to go through a bowling ball, and how would I calculate it. Also, is there a speed that is fast enough that that ping pong ball doesn't get demolished? (such as the front of the ball having enough energy in itself to go through the bowling ball such that the back of the ball doesn't expend any energy going through it because there is already a hole in it?)

This isn't a homework question, it's just something I'm wondering about soft body physics.
 
Physics news on Phys.org
But the front of the pingpong ball will be slowed up a bit on impact because of Momentum conservation, however fast it's going. That will involve an internal force within the ball, which will cause deformation, surely. If it damages the bowling ball, then how could you suggest that the pingpong ball could ever be unscathed? What if the bowling ball were fired at the pingpong ball? In the observational frame of the centre of mass of the two together, it would be the same situation.
There would, of course, be a speed at which the pingpong ball would 'penetrate' through the bowling ball - but it would come out of the other side in a sorry state.
 
Well I'm thinking of when a karate expert punches through a bunch of bricks, and doesn't hurt his hand, but if he goes two slow, he can break his hand because he hasn't punched through the bricks and all of that energy is immediately put back into his hand instead of over the course of time of the breaking.
 
There must be a lot more to the Karate situation. I think my simple argument shows what happens in the ping pong ball situation.
In Karate there is a lot of strength and psychology involved but there are clear limits to what can actually be achieved. You still need to apply the Physics rigorously to the situation.
 

Similar threads

Replies
2
Views
2K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 2 ·
Replies
2
Views
3K
  • · Replies 12 ·
Replies
12
Views
5K
  • · Replies 6 ·
Replies
6
Views
4K
  • · Replies 12 ·
Replies
12
Views
4K
Replies
8
Views
4K
  • · Replies 6 ·
Replies
6
Views
14K
  • · Replies 3 ·
Replies
3
Views
1K