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Physics-Energy Questions

  1. Feb 10, 2006 #1
    Hey guys,

    I have a few questions about energy. They're in multiple choice format:

    1. Two magnets attract each other. How can you increase their potential energy?
    A. Push them together
    B. Pull them apart
    C. Speed them up
    D. Heat Them
    E. None of the Above

    2. As a falling rock hits the ground, energy is transformed from
    A. PE to KE
    B. KE to PE
    C. KE to TE
    D. PE to TE
    E. None of the above

    3. As a rock falls frictionlessly to earth, energy is transformed from
    A. PE to KE
    B. KE to PE
    C. KE to TE
    D. PE to TE
    E. None of the above

    4. As a boy lifts the rock from the earth again, energy is transformed from
    Same possible answer choices as 2 and 3

    5. Chemical energy is most closely associated with
    A. Kinetic Energy
    B. Gravitational potential energy
    C. Elastic potential energy
    D. Electric potential energy

    6. Thermal Energy is
    A. The potential energy stored in the molecules
    B. The average kinetic energy of the molecules
    C. Unrelated to the temperature of the object
    D. Generated when potential energy is converted to kinetic energy without friction

    Thanks very much!! :smile:
     
  2. jcsd
  3. Feb 10, 2006 #2

    arildno

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    Science Advisor
    Homework Helper
    Gold Member
    Dearly Missed

    You made a mighty effort in typing all that in.
    thus, it shouldn't be too strenuous for you to post some of your thoughts on what the answers might be.
     
  4. Feb 10, 2006 #3

    lightgrav

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    Homework Helper

    What does this "Potential Energy" have the potential to realize?
     
  5. Feb 11, 2006 #4

    tony873004

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    Science Advisor
    Gold Member

    It has the potential to realize that if you:

    A. Push them together
    B. Pull them apart
    C. Speed them up
    D. Heat Them
    E. None of the Above

    and then release them, that they'll smash into each other with more energy.
     
  6. Jan 11, 2012 #5
    We talk about the properties which energy has and about its many forms but we never say what it is. I think that spacetime must vibrate in certain ways so as to create energy. What energy is, is then contained in a description of that vibration. Any ideas, anyone?
     
  7. Jan 11, 2012 #6

    gneill

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    Staff: Mentor

    I think this is speculative philosophy and not suited to Physics Forums and the homework help forums in particular. Read the guidelines that you agreed to follow when you joined.

    Also, new questions are often better served by creating a new thread rather than "necroposting" at the end of an old one.
     
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