Mechanics M2 (6678)

[étudiante]

Thanks you SOOO much! i'll let u know if i need help again

 

[Evolution]

oh i see... what i meant to ask was umm.. the formula we use for triangles is for an equilateral triangle right? or all triangles??

dats so nice of u

Nah it's for any triangle, the distance between the base and the c.o.m is 1/3 the distance between the vertex, and it's corrosponding base, so whatever the base and the vertex are, in any triangle you can use this rule.
anyways if you have any doubts, you can always add co-ordinates to the traingle and the c.o.m is at (x1+x2+x3/3 , y1+y2+y3/3)

 

[étudiante]

Nah it's for any triangle, the distance between the base and the c.o.m is 1/3 the distance between the vertex, and it's corrosponding base, so whatever the base and the vertex are, in any triangle you can use this rule.
anyways if you have any doubts, you can always add co-ordinates to the traingle and the c.o.m is at (x1+x2+x3/3 , y1+y2+y3/3)

ohhh! sorry my misconception (probs wid doing stuff privately >.<")
thanks for clearing it out

 

[Evolution]

Hiya everyone. I have a question and i was hoping you would help me out !
M2 june 2009 Q 7b
I would be very grateful if you could me, thanks in advance xx

OMG buddy, this question is easier than the first part, anyways it's just a simple case of SUVAT rules.
At point Y the velocity is 0. so u=0.
and you wanna find v. so v is the unknown.
the distance is 25m, s=25
and while falling down the particle will have two forces acting on the horizontal which is parallel to the surface, 2gsinα is acting down the plane and the friction force is acting up the plane. since the wieght didn't change the normal reaction force doesn't change, therefore the friction force won't change from the value in part a of the question. So you use F=ma to find the acceleration.
( 2gsinα - friction = 2 x acceleration)

so now you have s, u, and a, and you need to find v. so use v² = u² + 2as

 

[Evolution]

http://www.jonesthesum.greenhill.pembrokeshire.sch.uk/html/notes___exercises.html
M2 notes

 

[Evolution]

If I'm completely lucky I'll get somewhere around a B. But last time when I did M1 I thought I was gonna get an A in it, but instead I got an e. I'm really worried this might happen again.

 

[Youssef Ali Mohammed]

If I'm completely lucky I'll get somewhere around a B. But last time when I did M1 I thought I was gonna get an A in it, but instead I got an e. I'm really worried this might happen again.

I thought i was gonna get an A too and i got a D and totally screwed up my AS grade (got 88 in c1,2)
This exam , i really am clueless.....I know for a fact the the kinematics and projectile question is correct..
For center of mass i really dunno, i actually threw in a random number to get the show that..
I am HORRIBLE at moments, but i did myself proud in the moment question and the second part of COM
As for impulse, I THINK i'm sure of the first part, i got the second part but i really dunno wether its right or wrong..
the second impulse question deduced that the particle will remain at rest for some reason so i just left it.
I messed up the work energy questions...
I Am HOPING for a 70%> But M2 grade thresholds are beyond the roof for some odd reason...

 

[étudiante]

Projectile was easy...

how do u know the thresholds are high?

 

[étudiante]

O.O

who r da lucky ppl hu r getting 90-100% Inshallah! @.@

 

[Evolution]

O.O

who r da lucky ppl hu r getting 90-100% Inshallah! @.@

lol these people voted before they even did the exam.

 

[Youssef Ali Mohammed]

Projectile was easy...

how do u know the thresholds are high?

Edexcel.com gce grade thresholds... for 3 sessions in a row the 80% (A) was 68/75...which is freaking horrible since 68/75 is 92%
And yeh the projectile was easy, feels nice to secure 50% of the exam, (1 and 7) but i really did horrible in the rest..

 

[étudiante]

Edexcel.com gce grade thresholds... for 3 sessions in a row the 80% (A) was 68/75...which is freaking horrible since 68/75 is 92%

S-I-X-T-Y E-I-G-H-T for an A??
Shoot me please -.-"

they think we're engineers or something? :|

 

[Youssef Ali Mohammed]

S-I-X-T-Y E-I-G-H-T for an A??
Shoot me please -.-"

they think we're engineers or something? :|

And i wondered why soo many people got 50%- on last Jan session.....
If u wanna see the rest of GT heres a link : http://www.edexcel.com/iwantto/I want to Tasks/1201 GCE Units Grade Boundaries (Home Int).pdf... God save us all :/

 

[étudiante]

And i wondered why soo many people got 50%- on last Jan session.....
If u wanna see the rest of GT heres a link : http://www.edexcel.com/iwantto/I want to Tasks/1201 GCE Units Grade Boundaries (Home Int).pdf... God save us all :/

Thanks so much

Exactly! only prayers now
no more dan a C for me i guess :|

 

[Evolution]

And i wondered why soo many people got 50%- on last Jan session.....
If u wanna see the rest of GT heres a link : http://www.edexcel.com/iwantto/I want to Tasks/1201 GCE Units Grade Boundaries (Home Int).pdf... God save us all :/

ughh..

 

[Youssef Ali Mohammed]

ughh..

I know exactly how you feel

 

[étudiante]

I know exactly how you feel

we all can relate to it atm i guess Same boat