ksaimouli
  • ksaimouli
newton plane
Physics
schrodinger
  • schrodinger
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ksaimouli
  • ksaimouli
|dw:1358006505942:dw|
ksaimouli
  • ksaimouli
can u draw components indicate +and -
ksaimouli
  • ksaimouli

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mathmate
  • mathmate
Have you learned about FBD?
ksaimouli
  • ksaimouli
i am always getting T-Mg cos 60 =Ma
ksaimouli
  • ksaimouli
what is FBD
mathmate
  • mathmate
Free body diagram.
ksaimouli
  • ksaimouli
i know
mathmate
  • mathmate
So the next step is to isolate the object and put all forces that are applied TO the body.
mathmate
  • mathmate
Memorizing formulas is dangerous, because sometimes theta can refer to something else.
ksaimouli
  • ksaimouli
|dw:1358006756106:dw|
ksaimouli
  • ksaimouli
i did not memorize i drew FBD
ksaimouli
  • ksaimouli
something wrong with vectors
mathmate
  • mathmate
|dw:1358006741723:dw| Do you have something like this?
ksaimouli
  • ksaimouli
^ what i have
mathmate
  • mathmate
According your your FBD, "T-Mg cos 60 =Ma" is not correct.
ksaimouli
  • ksaimouli
i mean T-Mg sin 60
ksaimouli
  • ksaimouli
=Ma
mathmate
  • mathmate
That's good. Can you continue?
ksaimouli
  • ksaimouli
yes i can but i am getting acceleration as -
ksaimouli
  • ksaimouli
|dw:1358007157522:dw|
ksaimouli
  • ksaimouli
this is other half
ksaimouli
  • ksaimouli
-T+mg sin 30 =Ma
ksaimouli
  • ksaimouli
M is 5kg for both find the acceleration
mathmate
  • mathmate
|dw:1358007244777:dw| So you have two unknowns (T and a) and two equations. :)
ksaimouli
  • ksaimouli
ok so i got mgsin 30-mgsin 60=ma+ma
ksaimouli
  • ksaimouli
m=5kg for both i got a=-1.830 which is wrong
ksaimouli
  • ksaimouli
i must get a=1.830
mathmate
  • mathmate
Your equation assumed that the masses accelerate DOWN the 30 deg. plane, so a<0 is correct! :)
mathmate
  • mathmate
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
ksaimouli
  • ksaimouli
so what ur doing is making accelration + right
ksaimouli
  • ksaimouli
thanks
mathmate
  • mathmate
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.
mathmate
  • mathmate
yw! :)

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