I have a doubt which needs to be urgently solved cause i got a test tommorow!!!!!!!!The question is in the replies cause i cannot write a diagram or attach a diagram here!!!!! Its physics i know its a wrong section to ask at but i have no choice!!!!!!!

- anonymous

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- anonymous

I want to know how can we find the vertical component of the force vector here for normal reaction using \[N _{a}\cos \Theta\] rather than\[N_{a}\sin \Theta\]

- watchmath

It depends on where your \(\Theta\) is

- anonymous

hang on i am scanning the diagram

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- anonymous

here is the diagram pls answer quickly!!!!!!!!!!

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- anonymous

this fairly easy

- anonymous

so answer it pls!!!!!!!!!!!!!

- anonymous

well , just consider the angle between theta1 and the vector mg

- anonymous

so then!!!!!!!!!!

- anonymous

this will be 90 - theta

- anonymous

then do trig in that triangle

- anonymous

fine!!! further ahead!!!!!!!

- anonymous

yeh.. im answering it , its just a bit slow lol

- anonymous

k sorry!!!!!!

- anonymous

i need to know why is the vertical component of say Na NaCos Theta and not Na sin Theta

- anonymous

yeh , its basically because sin(90-x) = cos(x)

- anonymous

lol, thats wrong cos(90-x) = sin(x)

- anonymous

but is that the triangle we can use to do this cause i don't think so!!!!!!! and now i am confused with the two comments u made

- anonymous

can any1 make a quick video and attach it i know i am asking way too much but pls do if possible!!!!!!!!

- anonymous

ill draw a picture on paint , hopefully it will help lol

- anonymous

k hopefully!!!!!!!!!!!!

- anonymous

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- anonymous

ill do another one

- anonymous

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- anonymous

second picture is just redrawing the top triangle in the previous picture, and marking in what you know

- anonymous

now in the second triganle you apply trig
sin( 90-x) = Na / Fy

- anonymous

but sin(90-x) = cos(x)

- anonymous

so Fy = Na / cos(x)

- anonymous

wait dont think thats right

- anonymous

thanks for ur effort but cud u use a the line tool to make the diagram cause this is really strange i am not able to make sense

- anonymous

to be honest I dont really know what you are asking , what is the actual question ?

- anonymous

and if you look at it , the second triangle , the one that has two sides ( one being the y axis and the other being the plane along the track

- anonymous

that is a right angled trangle , and the angle between the track and the y axis is just 90-theta

- anonymous

then you re draw the triangle and apply basic trig ratios and simply sin(90-x) to cos(x)

- anonymous

i am trying to relate it to the concept of vectors which we can represent on the x axis and the y axis!!!!!

- anonymous

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