What is Running: Definition and 385 Discussions

Running is a method of terrestrial locomotion allowing humans and other animals to move rapidly on foot. Running is a type of gait characterized by an aerial phase in which all feet are above the ground (though there are exceptions). This is in contrast to walking, where one foot is always in contact with the ground, the legs are kept mostly straight and the center of gravity vaults over the stance leg or legs in an inverted pendulum fashion. A feature of a running body from the viewpoint of spring-mass mechanics is that changes in kinetic and potential energy within a stride occur simultaneously, with energy storage accomplished by springy tendons and passive muscle elasticity. The term running can refer to any of a variety of speeds ranging from jogging to sprinting.
Running in humans is associated with improved health and life expectancy.It is assumed that the ancestors of humankind developed the ability to run for long distances about 2.6 million years ago, probably in order to hunt animals. Competitive running grew out of religious festivals in various areas. Records of competitive racing date back to the Tailteann Games in Ireland between 632 BCE and 1171 BCE, while the first recorded Olympic Games took place in 776 BCE. Running has been described as the world's most accessible sport.

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  1. N

    Running Coupling for Weak Interaction

    How can I derive the running coupling for the weak interaction. I have found derivations for QED and QCD that involve the β function http://www.physics.umd.edu/courses/Phys741/xji/chapter1.pdf but I can't find anything specific for the WI. Thanks.
  2. N

    MATLAB Matlab Compiling Running (MCR)

    Dear Group, I am trying to run Matlab Compiling Running (MCR) using Python, DOS, Putty ...like matlab.exe Anyone who worked with it before, please give me some recommendation, Thank you very much Group. Nate Duong.
  3. Astronuc

    News Ben Carson Running for President

    Ben Carson seems to be rising in the polls, and he seems to be running on the issues. I hope he stays on the issues and doesn't resort to negative campaigning against the others running for president. Ben Carson on the issues: Inside the mind of the retired neurosurgeon surging in polls...
  4. Astronuc

    News Bernie Sanders Running for President

    Bernie Sanders is drawing large crowds to his rallies and speeches. What’s behind Bernie Sanders’ enormous rallies https://www.physicsforums.com/forums/current-events.20/create-thread He is registered as an independent in Vt. According to the Wikipedia article on him, Sanders is the...
  5. G

    Zero Acceleration in Running and in a Car

    1) While running with a constant velocity ; how do we consume energy? : Only due to vertical movement of our bodies, right? 2) When driving a car in a constant velocity; how this car could consume energy? It does not move upright-downright (in a very straight road).
  6. T

    Calculation of the running coupling

    The beta function is defined as: \beta(\lambda)=M\frac{d}{dM}\lambda If we make the substitution t=ln(p/M) the above equation becomes: \beta(\lambda)=-\frac{d}{dt}\lambda Now if we use e.g. the QED beta function \beta(e)=\frac{e^3}{12\pi^3} and for e(p=M)=e_0 the result is...
  7. tjvv

    Impact forces feet can receive without get injured

    Hi guys, I have been searching for references that could tell what are the average limits of impact (in Newtons per example) of running activity into human´s feet (material = bone). Basically the question I am trying to answer is per example to understand how much of linear acceleration...
  8. S

    Direction of frictional force when running

    When a person is running is frictional force forward or backward? I do not have good knowledge of
  9. StevieTNZ

    News Donald Trump Running for President

    Donald Trump, today, announced his candidacy for President -- http://edition.cnn.com/2015/06/16/politics/donald-trump-2016-announcement-elections/ -- as was alluded to https://www.physicsforums.com/threads/hillary-clinton-running-for-president.808180/page-4#post-5142830 I saw this thread...
  10. majormuss

    Have trouble running the Fermi software on ubuntu terminal

    Hi all, I recently installed ubuntu on my pc and I am trying to run the Fermi software provided by NASA (http://fermi.gsfc.nasa.gov/ssc/data/analysis/software/). I believe I did all the installation steps right but I am having trouble starting the software. If you are familiar with this...
  11. T

    Matlab code running loops to meet conditions

    Homework Statement This is not homework but I am trying to solve a problem to see to general a set of numbers for the grassmanian equations to use in something else.[/B] I have five variables a,b,c,d,e. a-b,a-c,a-d,a-e,b-a,b-c,...etc so that none of them are the same so it generates all...
  12. arivero

    Examples of mass predictions using running masses

    Do we have some? I mean, the typical argument voiced each time that someone tries to fit mass patterns against whatever formula is "you should be using running masses", or more precisely "you should be using all the masses renormalised at the same scale". And indeed it is a very logical...
  13. StevieTNZ

    News Hillary Clinton Running for President

    https://www.hillaryclinton.com/ http://www.nzherald.co.nz/world/news/article.cfm?c_id=2&objectid=11431624
  14. evinda

    MHB What Determines the Running Time of Kruskal's Algorithm?

    Hello! (Wave) The Kruskal's algorithm is the following: MST-KRUSKAL(G,w) 1. A={} 2. for each vertex v∈ G.V 3. MAKE-SET(v) 4. sort the edges of G.E into nondecreasing order by weight w 5. for each edge (u,v) ∈ G.E, taken in nondecreasing order by weight w 6. if FIND-SET(u)!=FIND-SET(v)...
  15. W

    What is the Inductance of Parallel Wires in a Circuit?

    1. Two wires running parallel to each other in a circuit can provide an inductance that is adjustable with their length. For the loop shown below with length L=2m , width w=5cm , and wire radius a=1mm , find the inductance in H?Homework Equations3. I thought i could find the inductance by...
  16. SmokeyMTNJim

    Exercise: who does more work weight lifter/marathon runner

    I was trying to identify which athlete does more work per rep/stride. I am trying to understand how a marathon runner can run sub 6 minute miles under aerobic conditions. To me this seems like a high intensity to I wanted to figure out who was doing more work, producing more force, or if you can...
  17. Glenstr

    Help with distance running formula

    In the winters, I run on an indoor track, and use a footpod to calculate my distances with my GPS watch. The facility has three lanes, inside #1 is 181.6 meters, middle lane #2 is 187.2 and outside #3 lane is 194.3 meters long. The track is more less rectangular shaped as opposed to a circle...
  18. S

    Running 3 motors in circuit, where to insert lipo alarm?

    Hi all! I'm working off of this schematic for a modded Nerf blaster (note: schematic not my own work). I am hoping to hook up a little lipo alarm (http://rcbitz.com.au/images/MiniLipoAlarm.jpg ) somewhere in there to display the voltage of my 1s lipo I'm using to power it. Question: Where...
  19. evinda

    MHB Best-Case Running Time of QuickSort: $\Omega(n \lg n)$

    Hello! (Wave) The following pseudocodes are given: quicksort(A,p,r) if p<r then q<-partition(A,p,r) quicksort(A,p,q-1) quicksort(A,q+1,r) partition(A,p,r){ x<-A[r] i<-p-1 for j<-p to r-1 if A[j]<=x then i<-i+1...
  20. E

    Need help picking material for sole for a running shoe

    Hello. I am thinking about creating an extremely lightweight running shoe to simulate barefoot running, and I need help on picking a material for the sole. 1. It has to be cheap 2.It has to be strong 3.No Metal 4.It has to be extremely bendable(able to role up into a tube)
  21. E

    Running Mbj potentail problem in dft wien2k sofware

    i am runnig mbj calculation using wien2k as mentioned in user guide but can't be able to successful run,ambiguity in scf's so can anyone please guide me clear steps for mbj calculation. and modifications
  22. M

    MHB Worst-case running time of algorithm

    Hey! :o Let the quicksort algorithm be the following: procedure QUICKSORT(S) if S contains at no one element then return S else begin choose an element a randomly from S; let S1, S2 and S3 be the sequences of elements in S less than...
  23. Filip

    Universe Tick Rate: Planck Time?

    I have been wondering this for a uncomfortable amount of time... Does the universe have a defined tick rate? By tick rate I mean a loop that processes all information and changes in the universe in that moment, similar how a video game or a computer processor work. I was also wondering if that...
  24. C

    Comp Sci Need Help Running a program in C++ for Ubuntu (Linux)

    Homework Statement m working on a Engineering Project and I'm having serious trouble trying to run this program in C++. I'm following an example of the program from Program done in C but I'm trying to convert it into C++. I'm going to link the example I'm following and what I'm doing trying to...
  25. M

    MHB Is it Possible? - Running a Program with Data Structures in Separate Files

    Hey! :o I have the main function of a program in a .c file. The main function uses data structures which are defined in an other .c file. And the main function uses also a .txt file to get some inputs. Is it possible to run the program if the main function is an other file as the definition...
  26. S

    Fortran Error 6404 when running fortran code in visual studio

    I am trying to compile several libraries of FORTRAN code and getting the error message as can be seen in the screen shot. As I do not have any experience with FORTRAN I am not sure what is wrong in the line highlighted line. Any help would be greatly appreciated! Thanks a lot! :-)
  27. M

    100 meter running with constant acceleration

    Hello, I am currently by some reason struggling with this problem. I cannot seem to get the correct reasoning here. I would appreciate any help! 1. Homework Statement Ann and Lisa cross the 100 m finish line at the same time, 10.2 s after start. Both had constant acceleration until they...
  28. G

    Asymptotic running time of code segments

    I'm trying to grasp some basic concepts of analyzing code segments. Not sure if I have the right thought process. Can't find many examples online. Homework Statement A.) for (i=1; i<n; i++) for (j=1; j<n; j++) return 1 Guess: Theta(n) because both loops go to (n) and they're...
  29. M

    Running out of Math Classes

    Hi I am a sophmore in high school doing multivariable calculus in a local community college and next semester I will be going into linear algebra with differential equations. The problem is that after differential equations and linear algebra the community college does not have any other math...
  30. M

    Understanding the Running of Mass in Particle Interactions

    I have a question on quantities that 'run' under the renormalization group flow. What's clear is that the properties through which particles couple -- such as charge, isospin, color etc -- change in their strengths as the energy increases. But this running is also true of the mass, which is a...
  31. O

    Integral x^2*e^(-x^2) running into error function

    Homework Statement I am trying to find the expectation value of <x2> of the following function: ψ[(x,t)]=(\frac{2am}{πh})[1/4]e[-a(\frac{mx^2}{h}+it)], where h is hbar and the integral is from -∞ to ∞ Homework Equations <x2>=\intx^2|ψ[(x,t)]|2dx The Attempt at a Solution The resulting...
  32. I

    Fortran Run Fortran Code - Tips from Ilango

    Dear all, Let me introduce myself first. I am Ilango from India. I am new to Fortran, mostly working on Matlab, Modelica & Dymola. Working in an automobile company I was required to go through some battery models and hence landed at this page. http://www.cchem.berkeley.edu/jsngrp/fortran.html...
  33. M

    Are running couplings distinctively 'quantum'?

    As is well known, the charges through which particles interact scale with the energy in QFT. What I was wondering is: can we say that this is a peculiarly 'quantum' phenomenon (or maybe, quantum-relativistic)? Is there a reason why it wouldn't be the case in a classical universe, for example...
  34. S

    How long could you survive without oxygen after running?

    Suppose you exerted yourself quite hard and ran for a while, then you were immediately deprived of oxygen. How long could you actually survive compared to deprived of oxygen at rest?
  35. Y

    Super capacitor for running DC motor

    Hi, I am planning to run a DC motor using a super capacitor. The specification of the motor are: Voltage : 90V - 120 V DC Current : 15 A Duration : Should run for atleast 10 seconds. I have finalized this super capacitor from maxwell for the above operation...
  36. DinosaursRock

    Are we really running out of fossil fuels?

    Just wondering if it's true when people say we will be out of oil in 50 years. If so are there plans to what's going to happen? Any answers are appreciated, thanks.
  37. K

    MATLAB [Matlab] Error running optimization.

    Error running optimization. Inputs must be a scalar and a square matri I am trying to use fminunc using optimtool. But i got the error Error running optimization. Inputs must be a scalar and a square matrix. this is the function i typed in the editor. function F = fun(x) F =...
  38. ChrisVer

    Running Constants: Unifying Gaugino Masses in SUSY

    Well I am having some difficulty in understanding the running constants... I am not sure if this applies to the Standard Model as well, but I saw that in SUSY recently... If we take the value of the gaugino masses m_{\bar{g}},m_{\bar{W}},m_{\bar{B}} (by bar I mean Gluino,W-ino and B-ino) to be...
  39. Dembadon

    Dog w/out collar running around: called animal control

    Yesterday afternoon I noticed a dog running up and down our street, occasionally wandering through and around neighbor's yards. I'd never seen this dog being walked in the neighborhood before, so I went outside and got it to come into our back yard. I immediately noticed it didn't have a collar...
  40. P

    Running Machines: Real Incline vs. Fake Conveyor Incline

    Increasing the incline on a belt type running machine increases the expenditure of energy of the runner. However the runner is not increasing his/her potential energy in the gravitational field. The only change appears to be in the manner the leg joints and muscles bend, flex, stretch and...
  41. J

    What is the significance of arm swing in running?

    Why are we unable to run faster without hands moving? What's the role of hands for running?
  42. M

    Force of water running through a hose

    My daughter is doing a science experiment based on a launch loop (http://en.wikipedia.org/wiki/Launch_loop). I hooked a 2600 psi pressure washer to two 1/8" OD tubes and then tethered them to a board. We rolled a tennis ball over the top of it when the water was flowing through the tubes (not...
  43. A

    M42 and the Running Man nebula with Takahashi 150mm

    First post on PF, thought I'd share my first serious attempt at astrophotography. I used itelescope since it's perpetual cloud cover where I'm at sadly, and all of my processing was done in Astroart. I learned a lot with this, but it's definitely an uphill struggle! M42 and the Running Man...
  44. Z

    Running DC motor at higher than rated speeds

    Hi, I had this power electronics lab experiment where we control the speed of a separately excited dc motor using thyristors. The dc motor is rated at 1500 RPM but we do get readings where the speed is above 2500 RPM. How is that possible? Thanks
  45. mesa

    Need software for running primality checks.

    I love pen and paper but am terrible with computing. I have a copy of MatLab on my computer and aside from the operating system and Word that's about it. I need software that can run primality checks on 'small' gigantic primes of 10,000-20,000 digits in length. Where do I need to start?
  46. P

    Running and Location/Distance Question

    Homework Statement Jan and Jorge ran away from a starting point. If Jorge ran 107m South and Jan ran 212m to the southwest, where is Jan relative to Jorge? Homework Equations Inverse cos = adj/hyp sin theta = opp/hypThe Attempt at a Solution Jorge runs directly south and Jan runs southwest. So...
  47. P

    Running Kinematics: Analyzing Speed and Acceleration in a Marathon

    Homework Statement A man decided to run a marathon. (a) What was his average speed, in m/s, for the first 5K? (b) At 5K, was he speeding up or slowing down? Explain. Homework Equations a) change in distance/time b) acceleration = change in velocity/ change in timeThe Attempt at a Solution...
  48. A

    I feel like I am running out of momentum life wise

    I feel like I am running out of momentum life wise. The last year has been so difficult for me that I see everything different. I still enjoy work and learning, but I don't enjoy school anymore. I have no confidence in myself academically despite actually making some good progress in an idea I...
  49. H

    Running at Different Speeds: Who Experiences Time Differently?

    Lets say we run(forever) with 200km/h and our friend with 10km/h. Time will run slower for me or will run faster for my friend?
  50. P

    Calculating Distance and Time for a Moving Car with Constant Acceleration

    Homework Statement A car starts to run from rest with acceleration 0.5 m/s2. How long does it take to travel distance 60m? [sic] (I have a Russian teacher for AP Physics) Homework Equations V= (Xf-Xi)/(Tf-Ti) ΔX= Vi*T+(1/2)aT2 The Attempt at a Solution I tried to find velocity, but that...
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