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Homework Help: Sick Physics student needs Help

  1. Dec 2, 2003 #1
    Sick Physics student needs Help!!!

    I was sick for one day of my Physics class and I missed the lecture on Equilibrium. I thought that I could just read the book and learn from there... but The book speaks a whole differant language than my teacher. I have no Idea how to do these problems, and because I'm an idiot and didn't ask my teacher before, i have tonight to make up my homework and I have no Idea how to do it... I can't afford to get a bad grade on this assignment (or the next test for that matter) cuz I am down to a C+ because of the last Test!

    I don't want to post all my homework on here for someone else to do it, and me still not understand what I'm doing...

    So if some kind soul out there wants to tudor me a little you can IM me on Earth_kissed4555@hotmail.com or you can e-mail me at the same address!!

    I only have tonight to try to figure this out so hopfully someone will see my plea for help in time!!

    Any help is welcome!! (BTW I thought it would be okay to skip Chemistry and go straight to Physics cuz it more has to do with my carrer goal, but now I regret it cuz I don't understand any of this!)

    A girl in need,
  2. jcsd
  3. Dec 2, 2003 #2
    Ah your a CHEAT-AH!
  4. Dec 2, 2003 #3


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    Staff Emeritus
    Science Advisor
    Gold Member


    Asking us to explain some large topic for you better than a textbook is not likely to generate many responses.

    Go ahead and post some (or all) of your problems here. We're not going to just hand you the answers, don't worry. We'll try to help you understand how to solve them.

    - Warren
  5. Dec 3, 2003 #4


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    Science Advisor

    Can you also explain a little bit more of what you mean by "equilibrium"? There are many kinds of equilibrium....
  6. Dec 4, 2003 #5
    Re: Sick Physics student needs Help!!!


    An object in equilibrium is a non-accelerating object. The sum of all forces effecting the body is zero.

    (Info found when i searched for equilibrium on yahoo)

    equilibrium, state of balance. When a body or a system is in equilibrium, there is no net tendency to change.

    In mechanics, equilibrium has to do with the forces acting on a body. When no force is acting to make a body move in a line, the body is in translational equilibrium; when no force is acting to make the body turn, the body is in rotational equilibrium. A body in equilibrium at rest is said to be in static equilibrium. However, a state of equilibrium does not mean that no forces act on the body, but only that the forces are balanced. For example, when a lever is being used to hold up a raised object, forces are being exerted downward on each end of the lever and upward on its fulcrum, but the upward and downward forces balance to maintain translational equilibrium, and the clockwise and counterclockwise moments of the forces on either end balance to maintain rotational equilibrium. The stability of a body is a measure of its ability to return to a position of equilibrium after being disturbed. It depends on the shape of the body and the location of its center of gravity (see center of mass). A body with a large flat base and a low center of gravity will be very stable, returning quickly to its position of equilibrium after being tipped. However, a body with a small base and high center of gravity will tend to topple if tipped and is thus less stable than the first body. A body balanced precariously on a point is in unstable equilibrium. Some bodies, such as a ball or a cone lying on its side, do not return to their original position of equilibrium when pushed, assuming instead a new position of equilibrium; these are said to be in neutral equilibrium. In thermodynamics, two bodies placed in contact with each other are said to be in thermal equilibrium when, after a sufficient length of time, their temperatures are equal. Chemical equilibrium refers to reversible chemical reactions in which the reactions involved are occurring in opposite directions at equal rates, so that no net change is observed.
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