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Homework Help: Plum-bobs < Help Please

  1. Mar 27, 2006 #1
    Hello

    I have to Explain how a plum-bob can me made and what it is used for? can anyone tell me this, i know what it is used for but i do not know how once can be made...

    I also need to know why it is said that a plum-bob always points towards the centre of the earth ? Please Help
     
  2. jcsd
  3. Mar 27, 2006 #2

    HallsofIvy

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    Science Advisor

    A plumb-bob is simply a weight- take anything that has weight and tie a string to it. A plumb-bob always points toward the center of the earth because of gravity- it is pulled down!

    (I'm moving this to "Introductory Physics")
     
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