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Homework Help: Word problem- moving object

  1. Oct 10, 2011 #1
    1. The problem statement, all variables and given/known data


    An object is moving to the right, and experiencing a net force that is directed to the right, The magnitude of the force is decreasing with time. the speed of the object is: constant or increasing??
    2. Relevant equations

    none?

    3. The attempt at a solution
    constant??
     
  2. jcsd
  3. Oct 10, 2011 #2

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  4. Oct 10, 2011 #3
    increasing wasn't it?
     
  5. Oct 10, 2011 #4

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    Uhh... :uhh:

    I don't remember. :confused:

    Why would it be increasing?
     
  6. Oct 10, 2011 #5
    because theres acceleration.
     
  7. Oct 10, 2011 #6

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    Aaaaah, yes. :)

    Well, this time it's about a force.
    Do you know the relation between acceleration and force?
     
  8. Oct 10, 2011 #7
    force equals mass times acceleration
     
  9. Oct 10, 2011 #8

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    Good! :smile:

    So we have an object moving to the right.
    In which direction is the force/acceleration?
     
  10. Oct 10, 2011 #9
    the right
     
  11. Oct 10, 2011 #10

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    Yep! :wink:

    Do you also know the relation between acceleration and speed?
     
  12. Oct 10, 2011 #11
    acceleration is the change in speed?
     
  13. Oct 10, 2011 #12

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    Yes. To be exact: acceleration is the change in speed per unit of time.

    Soooooo?
     
  14. Oct 10, 2011 #13
    sooo. its increasing?
     
  15. Oct 10, 2011 #14

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    Maybe...
    Why would it be increasing?
     
  16. Oct 10, 2011 #15
    um because its accelerating?
     
  17. Oct 10, 2011 #16

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    Yes, yes.
    I think I've dragged this out long enough.
    Yes, accelerating means speeding up.

    What is the reason you're still doubting your own answer?
     
  18. Oct 10, 2011 #17
    i dont know. cause i tend to be wrong. haha
     
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