Physical Definition and 1000 Threads

Physical therapy (PT), also known as physiotherapy, is one of the healthcare professions. Physical therapy is provided by physical therapists who promote, maintain, or restore health through physical examination, diagnosis, prognosis, patient education, physical intervention, rehabilitation, disease prevention and health promotion. Physical therapists are known as physiotherapists in many countries.
In addition to clinical practice, other aspects of physical therapist practice include research, education, consultation, and health administration. Physical therapy is provided as a primary care treatment or alongside, or in conjunction with, other medical services. In some jurisdictions, such as the United Kingdom, physical therapists have the authority to prescribe medication.

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  1. MiLara

    I Why do some but not all derivatives have physical meaning?

    I know that taking the derivative of certain functions that explain physical phenomena can lead to another statement describing the physical system, the most famous being the derivatives of position. That is, position-->velocity-->acceleration-->jerk-->jounce...and taking any other further...
  2. R

    Question about Organic Chemistry and Physical Chemistry

    Hi. I have a question about Organic and Physical Chemistry. I have already finished General Chemistry I and II and got decent scores on both of them (B on both of them). I am interested in taking Organic Chemistry, then Physical Chemistry afterwards. I know that both are different from General...
  3. Mayan Fung

    Physical interpretation of Schrodinger equation

    Schrodinger Equation is the very first step when we start learning QM. However, I never learned about the physical meaning of it. I have read a number of articles and discussion online. Regarding the ones I understand, there are generally two points of view. 1. Fundamental physical laws are not...
  4. S

    Physical interpretation of free body force diagram

    Homework Statement Free body force diagram question, where I have selected the best answer but the diagram doesn't ring completely true (see diagram uploaded). I think mathematically the diagram is sufficient but it doesn't properly represent the situation. Do you agree? Homework EquationsThe...
  5. P

    I Invalidating a patent directed to physical laws

    I'm an attorney trying to invalidate a patent that I believe is directed to patent-ineligible subject matter. It's been an interesting exercise, and I'd love to hear other ideas/suggestions/etc. on how to approach it. At a high level, the patent claims certain structures with a certain...
  6. L

    B Is wave a physical object or its just a model?

    Is wave a physical object or its just a model?
  7. S

    A Physical interpretation of Mandelstam variables

    In ##2-2## scattering, the Mandelstam variables ##s##, ##t## and ##u## encode the energy, momentum, and angles of particles in a scattering process in a Lorentz-invariant fashion. ##s=(p_{1}+p_{2})^{2}=(p_{3}+p_{4})^{2}## ##t=(p_{1}-p_{3})^{2}=(p_{2}-p_{4})^{2}##...
  8. A

    I Simple physical example for addition of angular momentum?

    I've been asked to replace a professor for a couple of classes in an undergraduate quantum mechanic course. I have to present some topics on angular momentum, including the addition of angular momentum. I have no problem with the general theory and can present it just fine. But I would like to...
  9. A

    B Why physical quantities need a unit?

    my question is why physical quantities need a unit?
  10. J

    Physical difference between various wave functions

    Homework Statement Is there a physical difference between the following wave functions? If yes, why? If no, why not? \Psi(x,0) =5e^{-ax^2} \Psi(x,0) =\frac{1+i}{\sqrt{3}}e^{-ax^2} \Psi(x,0) =e^{i\pi/7}e^{-ax^2} Homework Equations - The Attempt at a Solution They only differ in the...
  11. I

    Physical Review Letters -- How to submit my paper....

    How to submit paper to physical review letter? is there any specific criteria such as recomendation from expert? or can we submit without recomendation?
  12. Clive Redwood

    I Physical Significance of Eccentricity & Semi-Latus Rectum of Orbital Ellipse

    What are the physical significances of the eccentricity and of the semi-latus rectum of the orbital ellipse?
  13. Jackie CH Liu

    A A Quantum Theory of Spacetime, the Physical Reality of Cross

    I just want to share my paper I recently wrote. I am trying to submit for publication: [Reference to unpublished paper deleted]
  14. Megaton

    B What Is the Physical Meaning of Curvature in General Relativity?

    I'm new at this, trying to understand the overall picture of GR From what I understand space does not actually curve but rather test particles tracing out their world lines in Euclidean space as compared to ones tracing out their world lines near a source of gravity is the physical meaning of...
  15. tomdodd4598

    I Physical eigenstates of systems of n particles of spins sᵢ?

    I am relatively well versed when it comes to systems of spin, or doing the maths for them at least, but am unsure whether all of the {L2, Lz, (other required quantum numbers)} basis eigenstates for a general system of n particles of spins si, where si is the spin of the ith particle, can...
  16. F

    A Physical interpretation of correlator

    Consider the 2-point correlator of a real scalar field ##\hat{\phi}(t,\mathbf{x})##, $$\langle\hat{\phi}(t,\mathbf{x})\hat{\phi}(t,\mathbf{y})\rangle$$ How does one interpret this quantity physically? Is it quantifying the probability amplitude for a particle to be created at space-time point...
  17. P

    B Exploring the Meaning of "d" in Differential Physical Quantities

    [Mentor's note: This question was split off from: https://www.physicsforums.com/threads/meaning-of-physical-quantities-and-division.880214/] What does this differential "d" mean? Why say dE instead of E? or
  18. P

    B Meaning of physical quantities and division

    I read this interesting thread trying to find an answer to my questions (and I got even more confused). I study radiometry units in context of computer graphics. I have a few questions, starting from the basic ones: 1. Following AlexS's note, why is speed=distance/time and not distance*time? 2...
  19. F

    Cosmology Physical Foundations of Cosmology by Viatcheslav Mukhanov

    What are the prerequisites to read this book? In the book he stated that there are no GR and QFT knowledge assumed but some people said that it is not true. Can anyone comment on this book? Thanks.
  20. lamejane

    E-beam Physical Vapour deposition

    Hope we have some PVD specialists in the house :) we have a pfeiffer e-beam PVD in the lab which i use to deposit Ni and Pt thin films ( around 100nm each) on Si wafers. I have always had the problem of "Ni splashes" while heating the target ( with the e beam) which leads to a process stop (...
  21. CuriousLearner

    A The physical constants: relationship to mathematics?

    Do we have any examples of physical constants appearing in topics that are focused more on abstract mathematics? For example, do the values of the physical constants ever appear in the results of papers on mathematics that are not focused on direct applications to physics? Could they do so if...
  22. DoobleD

    B Is the wave function physical ?

    Is the wave function physical ? I've searched for this on the web, and most people seem to agree that it does not represent a physical thing. It'd be just a probability distribution. There is still debate and uncertainty about that question though. What annoys me then is what about the observed...
  23. L

    Studying Trouble with kinematics and other basic physical concepts

    [You don't need to read the whole thing, but I'd recommend doing so, because there are examples of my struggles somewhere in there, like specific problems.] Greetings as usual, It's me again. That hopeful physicist who somehow found himself at the wrong place with the wrong mind in the wrong...
  24. Nate0331

    Electromagnetism and injury -- physical contact at the molecular level....

    So here is my question, and maybe I am not asking it right, but here we go: If electromagnetism prevents me from actually touching anything at a quantum level, how is it that I can get cut by a knife, or get a road rash falling off my bike? If the negative field of electrons that surround...
  25. O

    General study tips for Physical Geology?

    Hey everyone, I am a CS major, and part of my curriculum has me taking 2 sequences in various sciences. Initially I wanted to do physics & chemistry. I ended up taking Physics I, but am unable to take Physics II next semester due to scheduling conflicts; thus this summer I am taking the first...
  26. M

    A Is this a valid physical analogy for the Riemann Hypothesis?

    http://arxiv.org/abs/1202.2115 I know Arxiv isn't a real journal, but this caught my eye. Is this a meaningful physical interpretation of the Riemann hypothesis? From what I understand, the zeta function can be modeled as a wave, but attempting to solve for the real part requires infinite...
  27. G

    I Velocity Addition: Physical Meaning of Non-Singularity at c?

    Hi. In the derivation of the relativistic formula for adding velocities, the Lorentz factor drops out. Mathematically, the formula works for inertial frames with relative velocity c and even gives an answer to Einstein's famous question about what happens if you drive at the speed of light and...
  28. F

    I Quantum superposition and its physical interpretation

    I understand that if we have a quantum mechanical system, then its state at some given time ##t## is fully described by a state vector ##\lvert\psi(t)\rangle## in a corresponding Hilbert space. This state vector containing all possible information about the distributions (of all possible values)...
  29. G

    I Would any physical event happen at absolute zero?

    For example if we could bring a radioactive atom to absolute zero, would it still be subject to the random radioactive decay? Or would absolute zero inhibit the normal half-life decay of the element? Perhaps in other words, would absolute zero inhibit the elapsing of time?
  30. S

    I Physical Meaning of complex wavenumber?

    Hey, This is my first post so I am hoping to do everything right :-) I do not understand the physical meaning of a complex wavenumber. I understand that, with a general approach u(x,t) = Re(A*[e][(i(kx-omega*t)]) and a complex wavenuber that the wave is decaying exponentially with x. What...
  31. EhrEnFeest

    What is the physical dimension/unit of Probability current?

    Homework Statement Question: What is the physical dimension of Probability Current for a particle in 1 dimension? (Quantum Mechanics) Homework Equations Quantum mechanical Probability Current: The Attempt at a Solution I know the physical dimension of mass, that is kg. If I know every...
  32. N

    Why do we use the physical quantity work to measure energy?

    Homework Statement To me it makes more sense to use force*time instead of force*distance. Because when you are aplying force to an object that isn't moving you're still wasting energy. Or when you push a weight over the same distance with little force or big force, the amount of energy wasted...
  33. B

    Physical pendulum with no fixed pole

    1. Homework Statement The violet sleeve has mass M and is free to move horizontally without friction. The green rod has mass 2M and length L and can rotate around a pivot on the sleeve without friction. At t=0, the rod is in vertical position and is rotating with angular velocity w. What are...
  34. arpon

    I Physical significance of integral of F cross dr

    In the vector calculus course, I calculated integrals like, ##\int \vec F \times \vec{dr} ## Does this kind of integrals have physical significance or practical application other than Biot-Savart's Law?
  35. MaxKang

    Sensation of heat, physical explanation?

    I've read some articles online saying that the temperature is a measure of average kinetic energy of molecules so as the temperature increases, more molecules will bump into each other. However, I still don't quite understand why we feel hot when more molecules bump into each other. Is high...
  36. T

    I Physical Significance of 2s Orbital Peaks?

    The volumetric probability density function for the 1s orbital of the hydrogen atom has 1 peak, and it occurs at the Bohr radius. http://img1.mnimgs.com/img/shared/content_ck_images/images/probability%20density.png For the 2s orbital, it has 2 peaks, neither of which coincides with an...
  37. RaulTheUCSCSlug

    Mathematical Methods in the Physical Sciences (alternative?)

    Is there any alternative books that teach you how to just do the problems rather than emphasizing why, and is there any books that emphasize why in an easier format? Something like a "mathematical methods for dummies" book? This is the book I'm referring to (...
  38. A

    Is it possible for heat to be a physical form?

    By physical form I mean stored chemical or actual be a physical thing you can touch. Yes I understand it already is a physical form in atoms but I mean is it possible to have a jar of heat.
  39. ing_it

    Physical Pendulum - Rod - Period and Distance From Center of Mass

    Homework Statement We have a rod (length L, mass m) suspended at a point whose distance from the center of mass is a. 1) prove that (generally) there exist two values of a (a1, a2) for which the pendulum oscillates with the same period. 2) derive and explain: T = 2\pi\sqrt{\frac{a_1+ a_2}{g}}...
  40. ErikZorkin

    I Eigenvalue degeneracy in real physical systems

    I understand this question is rather marginal, but still think I might get some help here. I previously asked a question regarding the so-called computable Universe hypothesis which, roughly speaking, states that a universe, such as ours, may be (JUST IN PRINCIPLE) simulated on a large enough...
  41. L

    I Is the wavefunction a physical quantity?

    Or is it a physical property of the quantum system? Or else? The Joint Committe fo Guides in Metrology: http://www.bipm.org/en/committees/jc/jcgm/ says that: "A physical quantity (or "physical magnitude") is a physical property of a phenomenon, body, or substance, that can be quantified by...
  42. H

    I Are Physical Laws Truly Reversible?

    Must an initial state always be mapped onto exactly one final state and vice versa? Consider a slope that is shaped like a curvy "w". Releasing a ball from either end will result in the same final state where the ball is stationary at the highest point in the middle. So does it mean that...
  43. Guidestone

    Question about Parasitic capacitances and physical grounds

    Hey guys, so the other day I had a course about capacitive sensors and this thing below came up. The capacitive sensor is connected to the conditioner via two coaxial cables, the outer conductor of those cables are conected to a metallic casing which is also conected to physical ground. The...
  44. A

    Calculation of permissible error in physical quantity

    Homework Statement I have doubt in calculating the permissible error. It goes as follows Measure of two quantities along with the precision of respective measuring instrument is A = 25.0 ± 0.5 m/s, B = 0.10 ± 0.01 s. A physical quantity C is calculated as C = A × B. What will be the value of...
  45. A

    Calculation of permissible error in physical quantity

    Homework Statement I have doubt in calculating the permissible error. It goes as follows Measure of two quantities along with the precision of respective measuring instrument is A = 25.0 ± 0.5 m/s, B = 0.10 ± 0.01 s. A physical quantity C is calculated as C = A × B. What will be the value of C...
  46. Kilo Vectors

    I How can any measure of a physical quantity be irrational?

    Hello Aren't all irrational numbers having an infinitely long decimal component? If so, how can any measure of a physical quantity be irrational? the decimal component is infinitely long..but the magnitude of the physical quantity surely isnt?
  47. G

    I Physical implications from Vitali sets or Banach-Tarski?

    Hi. Can we infer something about physics from stuff like Vitali sets or the Banach-Tarski paradox? Maybe if we assume the energy in a given space volume to be well defined and finite, that there must be fundamental particles that can't be split, or that there must be a Planck length and energy...
  48. H

    I Are physical constants subject to the uncertainty principle?

    Are physical constants, such as the elementary charge or the gravitational constant, subject to Heisenberg uncertainty principle, theoretically and empirically? Theoretically in the sense that infinite precision of these constants will directly violate HUP. Empirically in the sense that, for...
  49. Amine_prince

    What Physical Illnesses Can Prevent Student Participation in School Sports?

    what can make a student unable to attend physical activities at school ? like , what are the physical illnesses that make one unable to play sports . thank you
  50. DrClaude

    Quantum state vector and physical state

    Interesting new work on the link between quantum state vectors are physical states: Can different quantum state vectors correspond to the same physical state? An experimental test Daniel Nigg et al 2016 New J. Phys. 18 013007 Abstract A century after the development of quantum theory, the...
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