Post by: Yoda on September 12, 2012, 07:28:53 pm
Can someone please explain vertical motion and what formulas to use to find the veritcal motion?
Thankyah mang
Post by: Jenny_2108 on September 12, 2012, 08:42:56 pm
Hello
Can someone please explain vertical motion and what formulas to use to find the veritcal motion?
Thankyah mang
Vertical motion is one dimensional motion along a straight line of force :P
Normally we mention about vertical motion under gravity (constant acceleration g)
Formula:
P/S: I don't do Physics though, its just from Spesh :D
Post by: abeybaby on September 12, 2012, 08:46:54 pm
Post by: Jenny_2108 on September 12, 2012, 09:09:03 pm
s=vt-1/2at^2, dont forget that one!
its not in the formula sheet. Can we use it directly in the exam?
Post by: Bhootnike on September 12, 2012, 09:19:55 pm
s=vt-1/2at^2, dont forget that one!
its not in the formula sheet. Can we use it directly in the exam?
yes, its pretty much the same as the x= ut + 1/2at^2
except its using final veocity
Post by: Jenny_2108 on September 12, 2012, 09:22:13 pm
s=vt-1/2at^2, dont forget that one!
its not in the formula sheet. Can we use it directly in the exam?
yes, its pretty much the same as the x= ut + 1/2at^2
except its using final veocity
final and initial velocity are totally different. I'm unsure if we can use it without proving
Post by: Bhootnike on September 12, 2012, 09:26:02 pm
and no, you dont have to prove it.
its fine!
im sure lovephysics would love to share his thoughts on proving things in vce physics here btw :p
Post by: Jenny_2108 on September 12, 2012, 09:39:52 pm
i didnt say they were the same haha
and no, you dont have to prove it.
its fine!
im sure lovephysics would love to share his thoughts on proving things in vce physics here btw :p
LOLLLLLLLL
Post by: abeybaby on September 12, 2012, 11:25:24 pm
Post by: Bhootnike on September 13, 2012, 05:09:57 pm
its not on the formula sheet :O
i dont think it matters.
theres a few other formulas that arent on the formula sheet we use, e.g.
Post by: Aurelian on September 13, 2012, 05:20:56 pm
Post by: Jenny_2108 on September 13, 2012, 07:32:33 pm
Like you can't apply method of spesh into maths methods because the formula isn't in the course (you can but people said you might not get full mark for it)
Post by: Bhootnike on September 13, 2012, 07:43:48 pm
Like you can't apply method of spesh into maths methods because the formula isn't in the course (you can but people said you might not get full mark for it)
It says on vcaa im pretty sure that you get full marks still :)
i think you just need to justify, e.g. if you use second derivatives..! which you should do regardless of whether its spesh or methods
but yeah, theres many formulas in physics which we use that arent on the formula sheet.
tsfx gives out all these extra ones too which they say to use!
Post by: paulsterio on September 13, 2012, 07:53:24 pm
Now just add them:
Which is a common formula. There you go, it's not hard to derive and if you think about it, it's common sense because what you "add" to the initial velocity is what you "subtract" from the final velocity, if that makes sense.
final and initial velocity are totally different. I'm unsure if we can use it without proving
Not really, they're not "totally different" - remember that we are talking about rectilinear motion with constant acceleration, meaning that the final velocity is dependent upon the initial velocity. So they are related.
And lastly, Jenny, Physics is completely different to maths - in Physics, you're allowed to (and some would even say encouraged to) take shortcuts and use quick formulas, because marks are awarded for the correct answer in the box, i.e. if you get a correct answer in the box, you will be awarded full marks, regardless of your working.
Post by: Jenny_2108 on September 13, 2012, 08:33:52 pm
Post by: pi on September 13, 2012, 08:36:05 pm
im sure lovephysics would love to share his thoughts on proving things in vce physics here btw :p
I think it's implied ;)