Search the forum,

center

In physics, the center of mass of a distribution of mass in space (sometimes referred to as the balance point) is the unique point where the weighted relative position of the distributed mass sums to zero. This is the point to which a force may be applied to cause a linear acceleration without an angular acceleration. Calculations in mechanics are often simplified when formulated with respect to the center of mass. It is a hypothetical point where the entire mass of an object may be assumed to be concentrated to visualise its motion. In other words, the center of mass is the particle equivalent of a given object for application of Newton's laws of motion.
In the case of a single rigid body, the center of mass is fixed in relation to the body, and if the body has uniform density, it will be located at the centroid. The center of mass may be located outside the physical body, as is sometimes the case for hollow or open-shaped objects, such as a horseshoe. In the case of a distribution of separate bodies, such as the planets of the Solar System, the center of mass may not correspond to the position of any individual member of the system.
The center of mass is a useful reference point for calculations in mechanics that involve masses distributed in space, such as the linear and angular momentum of planetary bodies and rigid body dynamics. In orbital mechanics, the equations of motion of planets are formulated as point masses located at the centers of mass. The center of mass frame is an inertial frame in which the center of mass of a system is at rest with respect to the origin of the coordinate system.

View More On Wikipedia.org
Recent contents Top users
  1. D

    sitting ACS exam in Wales

    I'm having trouble locating a center I can go to sit my ACS exam. I have looked all over the internet but all I seam to be able to find is training companies offering the full package for exorbitant fees. I am NOT looking to do a training course. ALL I want to do is the exams. I live in...
  2. R

    Sunvic wiring center 2202

    I have just installed a greenstar 24 ri . I have disconnected the old oil boiler. The system has yplan control;s with wiring center. The problem is I dont know which connection is switched live or live return to the boiler on the wiring center as it is in a tight corner . There is 10...
  3. T

    Best "fast track" Gas course/training Center

    Does anyone recommendations and/ or advice? Cheers!
  4. T

    Yet another exiting oppertunity for GSR engineers

    Just recieved an email from Safety Check UK offering guatanteed work if I stump up a load of cash Safety Checks UK I don't think so
  5. U

    How many of you are going to one of these

    Hi Guys I went to one of these last year at Basingstoke and found the meeting to be completly unsatisfactory I will be going again to the next one to hear the results so what do you guys think of it all Competence Review 2010/2011 Information validation workshops in July 2011 Dear Some of...
  6. M

    rad sizing

    hi does anyone have a quick method of sizing radiators for a new install as the whole house method takes a long long time many thnaks
  7. T

    About time too

    Just had this email from gas safe, guess all you guys will get it to. It is not before time they did something like this. We are expected to work to a standard but the standard is a secret unless you can shell out major money. Access to normative standards and documents for smaller Gas...
  8. R

    Worcester conentional 30 kw wiring issue.

    Hi Just installed the above boiler on an existing ch system the existing system incorporates the honeywell smartfit s plan controls. I now need to connect the honeywell controls to the boiler. There is no 3 core with the worcester to connect to the honeywell wiring center .Do you need...
  9. C

    Brown push fit bend in upstairs toilet

    I have just had my soil stack altered to accomodate a corner toilet without a flexi. I was very pleased with the finished result: the toilet flushes really well, no up hill pipe, and no worries about flexi in the wall falling to bits in 5 years time. However, 3 plumbers have been round to quote...
    • Copper Top
    • Thread
    • attach bend brown center oil proper push fit toilet upstairs years
    • Replies: 4
    • Forum: Plumbing Jobs | The Job-board
  10. O

    Heard at Build center today!!!!!!!!!!!!!!

    "How do you do a pipe check on gas with no watch?" " I borrow the customers or count in thousands" "cant you use your mobile?" "Nah thats illegal!" said the one builder to another!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Old plumber at the back of the queue made a comment to the effect "bodge it and...
  11. C

    Ideal He24 boiler,condensation trap

    Hi, i've been having a problem with my ideal he24 boiler, the condensation trap is leaking from the drain plug valve,its only a plastic screw(red) at the bottom of the trap, any idea where i can get one from? I've tryed a few plumbing merchants,but no one as it.It's worn an cracked so is...
  12. P

    UK National Business Center (Heard of them? Scam?)

    I get repeated calls from this outfit, about a dozen. In the past I have asked them not to call me as I do not want to share my information with them. I have asked them to remove me from their call list to no avail. They called again today, as I am not currently feeling my best they got a a few...
  13. E

    Blueflameassociates NewCastle ACS Center

    Who can tell if they are "OK"to choose for the ACS Assessment ? Lets say I can choose any of them in UK .
  14. B

    Don't sent your granny to Plumb Center

    My granny phoned me to say her boiler wasnt working, I had a look, it turned out to be her thermocouple, so because she never had any heat and I had no spares I asked her to pop into Plumb Center the next morning and I would replace it when i got home from work. The guy at the shop wouldnt...
    • BrianL
    • Thread
    • apprentice banging boiler center corgi diy funny gas head installers internet job london merchants parts plumb price public trade underground van wall winter work
    • Replies: 20
    • Forum: Plumbing Jobs | The Job-board
Creating content since 2001. Untold Media.

Newest Plumbing Threads

DIY Advice
Tilers Forum
Tiling Advice
Tiling Forums UK
Tiling Tools
Back
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock