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Physics 15 Online
OpenStudy (ksaimouli):

newton plane

OpenStudy (ksaimouli):

|dw:1358006505942:dw|

OpenStudy (ksaimouli):

can u draw components indicate +and -

OpenStudy (ksaimouli):

@mathmate

OpenStudy (mathmate):

Have you learned about FBD?

OpenStudy (ksaimouli):

i am always getting T-Mg cos 60 =Ma

OpenStudy (ksaimouli):

what is FBD

OpenStudy (mathmate):

Free body diagram.

OpenStudy (ksaimouli):

i know

OpenStudy (mathmate):

So the next step is to isolate the object and put all forces that are applied TO the body.

OpenStudy (mathmate):

Memorizing formulas is dangerous, because sometimes theta can refer to something else.

OpenStudy (ksaimouli):

|dw:1358006756106:dw|

OpenStudy (ksaimouli):

i did not memorize i drew FBD

OpenStudy (ksaimouli):

something wrong with vectors

OpenStudy (mathmate):

|dw:1358006741723:dw| Do you have something like this?

OpenStudy (ksaimouli):

^ what i have

OpenStudy (mathmate):

According your your FBD, "T-Mg cos 60 =Ma" is not correct.

OpenStudy (ksaimouli):

i mean T-Mg sin 60

OpenStudy (ksaimouli):

=Ma

OpenStudy (mathmate):

That's good. Can you continue?

OpenStudy (ksaimouli):

yes i can but i am getting acceleration as -

OpenStudy (ksaimouli):

|dw:1358007157522:dw|

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