Re: Hydraulic Presses and Force
- From: "Timo A. Nieminen" <timo@xxxxxxxxxxxxxxxxx>
- Date: Sat, 1 Jul 2006 06:35:54 +1000
On Fri, 30 Jun 2006, Dennis B wrote:
Force is defined as mass times acceleration.
Close enough. (The original definition was rate of change of momentum, and this is still often a better definition, when one of the interacting things has no mass or acceleration.)
In other words, force is
essentially a measure of the total energy it takes to move a certain
mass a certain distance within a certain amount of time.
No, that's not F=ma in "other words", that's completely different. And wrong.
Go read some Newton. It's all there right at the start of Principia. Newton wrote in Latin, and our terminology has changed. Newton's "vis insita" (innate force) and "vis inertiae" (inert force, or force of inactivity) are what we now call "momentum", "impressed force" is what we now call "force". Newton goes to some effort to explain the difference between "innate force" and "impressed force", a difference sufficient for us to use two completely different names today.
--
T
.
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