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#109619 - 12/09/09 11:03 PM Re: Ball physics ? cant find the answer to help! [Re: J_w73]
Joe Bowler Offline
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Originally Posted By: J_w73
in that physics scenario.. just one point in space that they touch...no matter the size of the sphere

In a pure analytical geometry scenario, I would agree. But...the question was asked based on physics. There are too many internal and external forces acting on objects, no sphere is perfectly round, no surface is perfectly smooth, no object is perfectly resistant to compression. In fact, if it were possible to enlarge a cue ball to the size of the earth, it would have mountains with higher peaks and valleys with lower depths than imaginable.
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#109622 - 12/09/09 11:40 PM Re: Ball physics ? cant find the answer to help! [Re: Joe Bowler]
Leopard11 Offline
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Registered: 02/01/09
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Originally Posted By: Joe Bowler
Originally Posted By: J_w73
in that physics scenario.. just one point in space that they touch...no matter the size of the sphere

In a pure analytical geometry scenario, I would agree. But...the question was asked based on physics. There are too many internal and external forces acting on objects, no sphere is perfectly round, no surface is perfectly smooth, no object is perfectly resistant to compression. In fact, if it were possible to enlarge a cue ball to the size of the earth, it would have mountains with higher peaks and valleys with lower depths than imaginable.
Wow that is pretty wild. So if a cue was magnified to the size of the earth. The material that makes up a cue balls surface as we see and feel it being smooth in its natural size but have microscopic imperfections (i would assume) that we do not see or feel in its normal size would become amplified if it were to be scaled to the size of the earth?
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#109627 - 12/10/09 01:48 AM Re: Ball physics ? cant find the answer to help! [Re: Leopard11]
J.Brown Offline
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Registered: 11/21/08
Posts: 368
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Quote:
Wow that is pretty wild. So if a cue was magnified to the size of the earth. The material that makes up a cue balls surface as we see and feel it being smooth in its natural size but have microscopic imperfections (i would assume) that we do not see or feel in its normal size would become amplified if it were to be scaled to the size of the earth?


Yup exactly, if you looked at the surface of a cue ball in a microscope it would look like the surface of the moon.


Edited by J.Brown (12/10/09 01:48 AM)
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#109631 - 12/10/09 07:54 AM Re: Ball physics ? cant find the answer to help! [Re: J.Brown]
cgeorg Offline


Registered: 10/12/07
Posts: 3567
A/S/L: Pittsburgh, Pa
Things that affect surface area contact:

  • Lane surface - wood will be softer than synthetics, and different synthetics are softer or harder than others. The softer the material, the greater the contact area.
  • Coverstock hardness - different balls have different durometer ratings, which is the scale used by the USBC to limit how hard or soft a ball can be. Pearl balls tend to be harder than solids. Polyester coverstocks are harder than polyurethane. Some manufacturers intentionally make coverstocks on dry-lane balls harder - this is the case on the Lane Masters Hornet.
  • Coverstock chemistry - I would imagine that a more porous ball would have less actual contact with the lane than a less porous ball, but the contact points for the more porous ball would be spread out over a larger area.
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