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ksaimouli

  • 3 years ago

newton plane

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  1. ksaimouli
    • 3 years ago
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    |dw:1358006505942:dw|

  2. ksaimouli
    • 3 years ago
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    can u draw components indicate +and -

  3. ksaimouli
    • 3 years ago
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    @mathmate

  4. mathmate
    • 3 years ago
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    Have you learned about FBD?

  5. ksaimouli
    • 3 years ago
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    i am always getting T-Mg cos 60 =Ma

  6. ksaimouli
    • 3 years ago
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    what is FBD

  7. mathmate
    • 3 years ago
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    Free body diagram.

  8. ksaimouli
    • 3 years ago
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    i know

  9. mathmate
    • 3 years ago
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    So the next step is to isolate the object and put all forces that are applied TO the body.

  10. mathmate
    • 3 years ago
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    Memorizing formulas is dangerous, because sometimes theta can refer to something else.

  11. ksaimouli
    • 3 years ago
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    |dw:1358006756106:dw|

  12. ksaimouli
    • 3 years ago
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    i did not memorize i drew FBD

  13. ksaimouli
    • 3 years ago
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    something wrong with vectors

  14. mathmate
    • 3 years ago
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    |dw:1358006741723:dw| Do you have something like this?

  15. ksaimouli
    • 3 years ago
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    ^ what i have

  16. mathmate
    • 3 years ago
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    According your your FBD, "T-Mg cos 60 =Ma" is not correct.

  17. ksaimouli
    • 3 years ago
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    i mean T-Mg sin 60

  18. ksaimouli
    • 3 years ago
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    =Ma

  19. mathmate
    • 3 years ago
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    That's good. Can you continue?

  20. ksaimouli
    • 3 years ago
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    yes i can but i am getting acceleration as -

  21. ksaimouli
    • 3 years ago
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    |dw:1358007157522:dw|

  22. ksaimouli
    • 3 years ago
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    this is other half

  23. ksaimouli
    • 3 years ago
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    -T+mg sin 30 =Ma

  24. ksaimouli
    • 3 years ago
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    M is 5kg for both find the acceleration

  25. mathmate
    • 3 years ago
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    |dw:1358007244777:dw| So you have two unknowns (T and a) and two equations. :)

  26. ksaimouli
    • 3 years ago
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    ok so i got mgsin 30-mgsin 60=ma+ma

  27. ksaimouli
    • 3 years ago
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    m=5kg for both i got a=-1.830 which is wrong

  28. ksaimouli
    • 3 years ago
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    i must get a=1.830

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

  30. mathmate
    • 3 years ago
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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

  31. ksaimouli
    • 3 years ago
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    so what ur doing is making accelration + right

  32. ksaimouli
    • 3 years ago
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    thanks

  33. mathmate
    • 3 years ago
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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.

  34. mathmate
    • 3 years ago
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    yw! :)

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