oh the way i was taught tip to tail was you had to use cosine rule n allat
my best advice is for you to not over think vectors- I had the same problem but once I learnt vectors from 3u this crap become comprehendible. note u dont have to know much 3u prelim content to learn it so like nothing is stopping u and u get basically the best from both worlds. + if ur scared to use vecs just use vector component addition. safest option by far as aneoniudfhskdfhsklah said be4
a negative vector implies it's just flipped 180 degrees (or the other way if you're doing 3d)
ohhhh i get what you mean now, yeah definitely never connect more than 2 vectors at a time, it gets wayy too complicated esp trying to make all the vectors keep their angle, always break it up and then resolve it, i was just confused cause this what we were taught as 'tip to tail' so i didn't know how it was differentincoming 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 intoand
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 bywhile 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 pythagoreasand 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 SENSEyou 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
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 properlyyeah 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
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
by 3u, do you mean like 3u maths?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
yes
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 doincoming 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
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
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
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
EDIT: PLEASE DO NOT FORGET YOUR AXIS LABELS LIKE I DID HERE I'M TOO CEEBS TO DO ANYTHING
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" ?
Wdym by interpret the difference? You should be able to tell just by looking at the lables of fhe axisI 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 likeI 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
already??Biology test on tuesday.
