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Brian's response to the question about a bullet embedding itself in a
block of wood hit upon another question I had, namely: What do you call the
kinetic energy due to the motion of an object as whole, be it rotational or
translational, when you want to contrast it with the internal energy of the
object? Similarly for the potential energy associated with the position of
an object as a whole relative to something external to the object.
External energy, as Brian wrote, makes perfect sense to me but I don't
recall having heard that expression used that way before. I think
macroscopic energy seems to be more common.
-----Original Message-----embedding
From: Phys-l [mailto:phys-l-bounces@mail.phys-l.org] On Behalf Of brian
whatcott
Sent: Friday, February 2, 2018 12:32 PM
To: phys-l@mail.phys-l.org
Subject: Re: [Phys-L] Internal Energy of Wood Taking a Bullet
On 2/2/2018 9:21 AM, Jeffrey Schnick wrote:
When you fire a bullet into a block of wood, while the bullet is
itself in the wood, it is clear that the internal kinetic energy of thewood is
increasing. How about the internal potential energy of the wood? Is itreasons,
increasing because chemical bonds are broken, increasing for other
decreasing because the wood is being compacted bringing the moleculesincreasing
closer together where they find themselves more strongly bound,
decreasing for other reasons, or staying the same?
_______________________________________________Shear and bending to fracture in the substrate heats it somewhat,
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its temperature and increasing the local entropy. The recoil mayincrease its
external kinetic energy as well._______________________________________________
Brian W
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