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ksaimouli Group Title

newton plane

  • one year ago
  • one year ago

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  1. ksaimouli Group Title
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    |dw:1358006505942:dw|

    • one year ago
  2. ksaimouli Group Title
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    can u draw components indicate +and -

    • one year ago
  3. ksaimouli Group Title
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    @mathmate

    • one year ago
  4. mathmate Group Title
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    Have you learned about FBD?

    • one year ago
  5. ksaimouli Group Title
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    i am always getting T-Mg cos 60 =Ma

    • one year ago
  6. ksaimouli Group Title
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    what is FBD

    • one year ago
  7. mathmate Group Title
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    Free body diagram.

    • one year ago
  8. ksaimouli Group Title
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    i know

    • one year ago
  9. mathmate Group Title
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    So the next step is to isolate the object and put all forces that are applied TO the body.

    • one year ago
  10. mathmate Group Title
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    Memorizing formulas is dangerous, because sometimes theta can refer to something else.

    • one year ago
  11. ksaimouli Group Title
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    |dw:1358006756106:dw|

    • one year ago
  12. ksaimouli Group Title
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    i did not memorize i drew FBD

    • one year ago
  13. ksaimouli Group Title
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    something wrong with vectors

    • one year ago
  14. mathmate Group Title
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    |dw:1358006741723:dw| Do you have something like this?

    • one year ago
  15. ksaimouli Group Title
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    ^ what i have

    • one year ago
  16. mathmate Group Title
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    According your your FBD, "T-Mg cos 60 =Ma" is not correct.

    • one year ago
  17. ksaimouli Group Title
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    i mean T-Mg sin 60

    • one year ago
  18. ksaimouli Group Title
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    =Ma

    • one year ago
  19. mathmate Group Title
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    That's good. Can you continue?

    • one year ago
  20. ksaimouli Group Title
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    yes i can but i am getting acceleration as -

    • one year ago
  21. ksaimouli Group Title
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    |dw:1358007157522:dw|

    • one year ago
  22. ksaimouli Group Title
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    this is other half

    • one year ago
  23. ksaimouli Group Title
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    -T+mg sin 30 =Ma

    • one year ago
  24. ksaimouli Group Title
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    M is 5kg for both find the acceleration

    • one year ago
  25. mathmate Group Title
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    |dw:1358007244777:dw| So you have two unknowns (T and a) and two equations. :)

    • one year ago
  26. ksaimouli Group Title
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    ok so i got mgsin 30-mgsin 60=ma+ma

    • one year ago
  27. ksaimouli Group Title
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    m=5kg for both i got a=-1.830 which is wrong

    • one year ago
  28. ksaimouli Group Title
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    i must get a=1.830

    • one year ago
  29. mathmate Group Title
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    Your equation assumed that the masses accelerate DOWN the 30 deg. plane, so a<0 is correct! :)

    • one year ago
  30. mathmate Group Title
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    It is logical that the masses slide down the 60 deg. plane. So put mg sin(60)-T = ma , and T-mg sin(30) = ma This assumes mgsin(60)>T (=> a>0) and T>mg sin(30) , again => a>0

    • one year ago
  31. ksaimouli Group Title
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    so what ur doing is making accelration + right

    • one year ago
  32. ksaimouli Group Title
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    thanks

    • one year ago
  33. mathmate Group Title
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    You don't always have to guess the direction right the first time. Make a reasonable guess, using logic, and if it comes out negative, reexamine to see if it is logical, or if you made a mistake. This is how scientiests work: examine the work when there is a surprise.

    • one year ago
  34. mathmate Group Title
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    yw! :)

    • one year ago
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