Kevin and Colleagues,



Kevin asked:

>>So, Norman, is it proper in biomechanics, in your opinion, to say that the force flows from one bone to another or from one object to another.  Or is this improper terminology?  I understand that energy and power can flow from one segment to another, however, it doesn't seem that it would be proper to say that force flows from one segment to another.  Isn't that correct?>>

Proper term to use is "force is transmitted from one bone to another".



And Kevin commented:

BTW, Norman, congratulations on significantly decreasing your gravitational acceleration on the Earth since I last saw you.  I guess this means you won't be able to keep up with me now at the bars in Boston in October. ;-)

Thansk for kind words.

Regarding keeping up with you, there is need to determine thru experimenting/testing if decreasing gravitational acceleration on the Earth will hinder the keep-up. Hypothesis for this study is three-fold:

1) Decrease in gravitational acceleration on the Earth will not significantly reduce the keep-up,

2) Decrease in gravitational acceleration on the Earth will significantly affect/reduce the state of the keep-up, and

3) Decrease in gravitational acceleration on the Earth will significantly affect the state of keep-up next morning.



Cheers,

and appropriate here

Norman



	-----Original Message----- 

	From: A group for the academic discussion of current issues in podiatry on behalf of Kevin Kirby 

	Sent: Mon 9/20/2004 11:43 PM 

	To: [log in to unmask] 

	Cc: 

	Subject: Re: GRF on Forefoot, What Moves?

	

	

	Norman and Colleagues:

	 

	Norman wrote:

	 

	<<The term "flow" is mostly assosciated with displacement of matter in liquid or gas states, and one reason why "flow of force" is not often found in biomechnaics, mechanics and engineer related books.

	

	Also, transmission of force is most often used, and one reason is from that a force (load) causes vibration at molecular level on the matter (structure) the load is applied to. This vibration of the molecules also act on the adjacent and touching structures, such that the molecules of the adjacent structure also start to vibrate. This vibration is source of energy, and why it is most often written/referred as energy transfer, hence force transfer (transmission of force). In true terms, if is not force that is transmitted, but the eneregy discipated from the vibrating molecules of one structure onto its adjacent structure. A mouth full to use, and since what is most often measured is force (a parameter of energy, and not the actual energy - vibration of molecules), transmission of force is used.

	

	"May the Force be With You" for a Jedi fighting (self-defense I should say in the case of a Jedi) sounds more appealing than "May the Energy be With You".

	

	Fighting, force, kicking butt... sounds more appealing with the term force then with the term energy, especially to my 9 year old where the one who is kicking butt has more force. Energy, what is that Dad?

	

	Also, "flow of force" is an english use, has some meaning/understanding, but which is hard to translate as is in other languages. Wonder how Bart would translate flow of force in Flemish, as opposed to transmission of force...:-)

	 

	Force is flowed from the calcaneous into the talus.

	Force is transferred from the calcaneous into the talus>>

	 

	So, Norman, is it proper in biomechanics, in your opinion, to say that the force flows from one bone to another or from one object to another.  Or is this improper terminology?  I understand that energy and power can flow from one segment to another, however, it doesn't seem that it would be proper to say that force flows from one segment to another.  Isn't that correct?

	 

	BTW, Norman, congratulations on significantly decreasing your gravitational acceleration on the Earth since I last saw you.  I guess this means you won't be able to keep up with me now at the bars in Boston in October. ;-)

	 

	Cheers,

	 

	Kevin

	 

	****************************************************************************

	Kevin A. Kirby, DPM

	Adjunct Associate Professor

	Department of Applied Biomechanics

	California School of Podiatric Medicine at Samuel Merritt College

	 

	Private Practice:

	107 Scripps Drive, Suite 200

	Sacramento, CA  95825  USA

	 

	Voice:  (916) 925-8111     Fax:  (916) 925-8136

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