This discussion is now closed.

Check out other Related discussions

The Edexcel M3 (14/06/12 - AM) Revision Thread

Scroll to see replies

Reply 20

jukebox123

Original post by browb003

In one of the cases yes;

Case (i)

When t = 0, x = 0
ie the oscillation starts from the origin
For this, you would use

x = asin(\omega t)

as the displacement - time graph follows that of a sine graph.

Case (ii)

When t = 0s, x = AMPLITUDE
ie then oscillation starts from the displacement furthest away from the origin
In this case, you'd use

x = acos(\omega t)

as the displacement - time graph follows that of a cosine graph

Hopefully this distinguishes between the two 'types' of oscillations that M3 deals with :smile:

Is it that simple?
We just have to pretty much remember both formulae?

Reply 21

bencwbrown

Well there are a few more formulae to remember, but those are the only 2 you need to remember directly relating displacement and time yeah :smile:

Reply 22

jukebox123

Original post by browb003

Well there are a few more formulae to remember, but those are the only 2 you need to remember directly relating displacement and time yeah :smile:

Cool, are you doing FP2/FP3?

Reply 23

bencwbrown

I will be next year (I changed from doing history and french to doing physics and further maths after my first year of 6th form, and my first 2 further maths modules have will be M2 and M3) to get the full further maths A level

Reply 24

jukebox123

Original post by browb003

Oh, why the change? And also, have you done any other a-level maths modules in the past?

Reply 25

bencwbrown

I decided that I wanted to do a science degree, and that I'd be a weaker candidate compared to everyone else without physics and further maths (and now I'm looking at a maths and physics joint degree which is quite funny considering that physics is one of the A levels that I took up ha) and I've done C1, C2, C3, S1, M1 but I'm hoping to replace S1 with M2 as S1 is my weakest module

Reply 26

jukebox123

Original post by browb003

Cool, what UMS did you get in these modules?

Reply 27

bencwbrown

C1 - 97
C2 - 88
C3 - 84
S1 - 79
M1 - 83

I hope to get a sneaky 100% in C4 to get an A* ha, (I've seriously upped my workload to try and achieve that ha)

We need more people talking in this threa ha, it seems to be sliding away from M3 :tongue:

Reply 28

jukebox123

Original post by browb003

I'm doing C4 aswell, I'm hoping our paper is nothing like the m2 or m4 papers...they were impossible!

Reply 29

jukebox123

Original post by browb003

hey, could you please help me with excercise 3D question 3.b? I can't get to the answer at the back :frown:

Reply 30

bencwbrown

Original post by jukebox123

hey, could you please help me with excercise 3D question 3.b? I can't get to the answer at the back :frown:

I've made a picture showing how I got the answer :biggrin:

The right hand side is part b

You might have to download it or right click and select view picture to get it larger

Reply 31

jukebox123

Original post by browb003

I've made a picture showing how I got the answer :biggrin:

The right hand side is part b

You might have to download it or right click and select view picture to get it larger

Thank you very much! :smile:

Reply 32

elkana

Original post by browb003

simple question but i dont know the answer

does F=Tcos(a)
or does T=Fcos(a)
paint elka.png

thank you

Reply 33

bencwbrown

Original post by elkana

simple question but i dont know the answer

does F=Tcos(a)
or does T=Fcos(a)
paint elka.png

thank you

I'd say that both are correct, where is the question from? I think it would be interesting to see the context of where it's from

Reply 34

elkana

Original post by browb003

I'd say that both are correct, where is the question from? I think it would be interesting to see the context of where it's from

i made it up since they seem to be the same but it cannot be
lets say that a where 60
then 2F=T
and 0.5F=T
how can that be

Reply 35

bencwbrown

Original post by elkana

i made it up since they seem to be the same but it cannot be
lets say that a where 60
then 2F=T
and 0.5F=T
how can that be

Well then the object that the forces are acting on wouldn't be in equilibrium so the object would have an acceleration I assume

Reply 36

elkana

Original post by browb003

Well then the object that the forces are acting on wouldn't be in equilibrium so the object would have an acceleration I assume

oh yes silly me

Reply 37

bencwbrown

To help everyone revise, here are booklets on each individual topic in M3.
I've even included the reports on each question as they are quite interesting to resort to if you get stuck on a question :biggrin:

Circular Motion - Horizontal Circles.pdf138.8KB

Circular Motion - Horizontal Circles REPORT.pdf70.7KB

Circular Motion - Horizontal Circles SCHEME.pdf158.2KB

Circular Motion - Vertical Circles.pdf146.3KB

Circular Motion - Vertical Circles REPORT.pdf113.9KB

Circular Motion - Vertical Circles SCHEME.pdf210.3KB

CoM.pdf279.2KB

CoM REPORT.pdf53.3KB

CoM SCHEME.pdf168.4KB

Reply 38

bencwbrown

Second lot