The concept of work?.... and(unrelated)mass and the law of energy?

Question

I want to ask to questions but not use up 10 points.

Question #1
Work in physics is defined by one moving an object. My question is how is doing no work even possible, when just by standing at rest on (lets say) a floor we are bending it. The molecules in the floor are moving, so aren't we in fact doing work? Isn't bending something the same thing as doing work because there is movement on the molecular level? Please explain this if you can because I'm confused.

#2. can some energy be lost as it converts from one form to another(i.e. light to heat). The two forms are made of different properties, but would the mass of heat be equal to the mass that the light had? If yes, how can it if the properties are different. Basically how can energy go from one state to another without loosing part of itself as its properties change during conversion.. I mean you have to lose and gain something to change right? Is lost energy the same thing as destroyed.

I know there is error in my thinking

because energy cannot be created or destroyed, so if you see some wrong thinking here, please straighten me out.

If you get confused, let me know and I will try to restate my question as best as I can. If you can restate it better go for it.

P.S you don't have to answer both of them, just whatever you feel you can. Thanks.

*This isn't homework, it just for my own understanding. Peace:-)*

Answer 1

Hey,
If you are standing on the floor and not moving then how fast are the molecules of the floor moving (ignore rotational spin, and a thermal component bla bla bla,) toward each other? Well if you think about it they are not moving (like how you were referring) they are bent but not in motion. So w = Fd there is no 'a' in the F = ma so no force means no work. So you are right in your intuition when thinking that there is work being done when things are bent but when the deformation process of the object being bent stops so does the work.

Now number two
There is never any loss of energy. Let me just throw that out there first. Steven Hawking is having a problem with this law too (just with the loss of mass in black holes, I described this on another answer sheet). Let me describe how the light bulb works and maybe that will help put things into perspective. Electricity is formed from some process that uses a change in magnetic field and some metal (I am going to keep it simple so my fingers don't fall off, I am not saying a lot here) this magnetic field change causes a change in the motion of electrons, etc, etc, which brings things to heat up when the electricity has resistance to go through. Now the energy of the motion of the electrons (this is not the whole story but you get the point) is changed to heat (not all of it, some remains a kinetic energy within the system) in the filament of the bulb. This "heat" causes the electrons of atoms in the filament to raise then fall. When the electrons fall there is a release of energy in the form of a photon of a certain frequency so it has a certain energy. (reminder all of this is sprung forth from whatever caused to change in magnetic field in the beginning, whether it be sunlight, water fall, a kid on a bike all applying a force to a distance which is work, so energy etc). These photons are what we call light. You seem to think that energy is somehow changed in all this, when really it is the medium where the energy is that is changed. All energy is conserved, any "loss" is maybe thermal, like heat, photogenic, like light, or kinetically like electricity. I wish I could answer you more clearly, if you can come up with a more specific question I'll gladly answer that one. This question you ask is very common, a lot of people have no idea how energy is truly conserved, so you are not alone.

Answer 2

Question 1:
"Work" requires that energy be expended.
An object at rest, (on the floor) is exerting force,
which is balanced by an opposing force.
No energy is expended. No "work" is being done.
The bending of the floor is potential energy
generated when the object was laid in place, and
recovered when it is moved. (There is "work" in the
motion, but not in the steady state condition).

Question 2:
Lost is definitely NOT the same as destroyed.
Energy is not destroyed. It can be hard to keep
track of where it all winds up in any given
transformation and so some might get "lost" in
any given experiment, but if you look hard
enough you will always find it, (at least that has
been the case so far).
Energy loss is an engineering calculation, and yes,
for practical purposes lost energy is of no use, but
that does not invalidate the principle that it is not
destroyed and often makes a problem by showing
up where it is not wanted. (eg. heat in a transformer).

Answer 3

if i can not see the backside and do not know wherein it ends and feature the phantasm that i will be able to use divine vigour and principles... then i reside in a dream. the beingness is residing the character (you, the ego), now not the character is residing the beingness. simply permit your self fall and you spot the unknown is the identified. best through pushing it away considering you're break free it you create the hole, the phantasm of being separate.