Class of 2025 (2025 HSC CHAT) (6 Viewers)

[banigul@30]

yeah components can never get the wrong answer if you define your directions properly and yet my friend & i lost a mark in the first prelim phys assessment because the teacher got a different answer somehow? and when asked, he couldn't even explain why

lol yeah, my phys tutor didn't tell us about the negative and postive direction thing until like 2-3 lessons in and told us a formula (like next to the horizontal and the resultant) for where to add the angle instead of just measuring it from on a position on the cartesian plane, so we were all sooooo lost and id always get the wrong answer, i think the more self study you do the better you get at actually understanding how to do it properly

did you get the mark in the end?

 

[Aeonium]

lol yeah, my phys tutor didn't tell us about the negative and postive direction thing until like 2-3 lessons in and told us a formula (like next to the horizontal and the resultant) for where to add the angle instead of just measuring it from on a position in the cartesian plane, so we were all sooooo lost and id always get the wrong answer, i think the more self study you do the better you get at actually understanding how to do it properly

did you get the mark in the end?

naw components was really straightforward personally it seems like your tutor tried to teach you a shortcut before teaching the content fully; if you understand how negative vectors work then it'd make more sense and if you consider the 3u components form it's also nice

no, neither of us did

 

[banigul@30]

naw components was really straightforward personally it seems like your tutor tried to teach you a shortcut before teaching the content fully; if you understand how negative vectors work then it'd make more sense and if you consider the 3u components form it's also nice

no, neither of us did

by 3u, do you mean like 3u maths?

 

[C_master]

by 3u, do you mean like 3u maths?

yes

 

[notsmartenough]

how do i drop out

 

[eternallyboreduser]

incoming yap fest:

okay so here's what i do personally (easier than tip to tail + cosine and more relevant to module 5)
so you can consider each vector kind of like a right angle triangle. you have TWO perpendicular components (cause phys only does 2d vectors)
so you want to break down each vector into and components using trigonometry.

for instance, a vector angled at 30 degrees above the horizon with a magnitude of, say, 45 can be broken down into the component parallel to the horizon and the component perpendicular to the horizon
. View attachment 42620

for this, the perpendicular component is given by while the parallel component is given by . with this, you can sum all the perpendicular components and parallel components separately and use pythagoreas to get the resultant (make sure to inverse tan the components to get the final vector)

example:
vector a has a magnitude of 75 and is pointing at N30E, vector B has a magnitude of 30 and is pointing at S45W.
View attachment 42621
you can sum the horizontal components as such:

and then vertical:

and then to get the resultant vector, you use pythagoreas and inverse tangent for direction

i suggest this method for two reasons
1. it's easier when you have many different vectors (collisions in module 2)
2. you will decompose vectors anyways in module 5 for projectile motion
ALSO I LOWKEY FORGOT BEARINGS BUT LIKE I HOPE THIS MADE SENSE you can also make a table of the x and y components.
EDIT: PLEASE DO NOT FORGET YOUR AXIS LABELS LIKE I DID HERE I'M TOO CEEBS TO DO ANYTHING

For me thats easy but like the harder qs with relative velocity i just cant get. Like when it comes to math and chem for the harder qs i just have intuition which allows me to lnow what to do but when it comes to physics its like all my intuition disappears and i have no clue whag to do

 

[Aeonium]

For me thats easy but like the harder qs with relative velocity i just cant get. Like when it comes to math and chem for the harder qs i just have intuition which allows me to lnow what to do but when it comes to physics its like all my intuition disappears and i have no clue whag to do

hmmm do you have an example of one? is it like a qn where you're given "the velocity of a relative to b is ... and the velocity of a with respect to the ground is ... –> find velocity of b" ?

 

[Sylfiphy]

I know this is the easiest thing ever but since we're talking abt physics someone pls tell me how interpret the difference between displacement time graphs, velocity time graphs and acceleration time graphs coz it makes sense until I'm not reading the theory and doing the questions by myself

 

[kkk579]

I know this is the easiest thing ever but since we're talking abt physics someone pls tell me how interpret the difference between displacement time graphs, velocity time graphs and acceleration time graphs coz it makes sense until I'm not reading the theory and doing the questions by myself

Wdym by interpret the difference? You should be able to tell just by looking at the lables of fhe axis

 

[Aeonium]

I know this is the easiest thing ever but since we're talking abt physics someone pls tell me how interpret the difference between displacement time graphs, velocity time graphs and acceleration time graphs coz it makes sense until I'm not reading the theory and doing the questions by myself

the relationship within each is like
area under velo time graph = displacement
area under accel time graph is velocity

 

[melanie_o]

Biology test on tuesday.

 

[Average Boreduser]

Biology test on tuesday.

all the best

 

[banigul@30]

Biology test on tuesday.

already??

 

[Average Boreduser]

already??

I had my first internal in wk 4bruh

 

[C_master]

I had my first internal in wk 4bruh

For some reason I always think your a 2024er

 

[banigul@30]

I had my first internal in wk 4bruh

i was supposed to have my perms and combs test last thursday but sir shifted it to friday this week , but i had my first adv test in wk4 too

 

[banigul@30]

already got my marks back too

 

[Sylfiphy]

bro I don't get motion graphs at all

already got my marks back too

did u go well?? Rooting for u bro

 

[banigul@30]

did u go well?? Rooting for u bro

no i got 33/35, but like the highest was full marks

 

[ExtremelyBoredUser]

guys so does physics js go downhill after module 1.. cuz like its been 3 weeks and module 1 is so fun and easy but my classmate showed me year 12 mod 8 or something and it looks like straight horror

no mod 1 - 2 is straight ass its like learning how to tie ur shoes so u can run in a marathon. phys is fun, just be good.