Edexcel AS/A2 Mathematics M1 - 8th June 2016 - Official Thread

c2 was pretty sound altho i messed up the discrimination question on c1 :/

you?

For this question, why is it not possible to just say x + 9 = 41 --> X = 41 - 9 = 32N? I thought resultant forces are the sum of the other forces :/?

the forces are not acting in the same direction. You need to draw a force diagram (triangle in this case), showing the forces in series (one after the other). The resultant is the diagonal joining the start point to the end point

Ah alright, thanks

Also, is it just me being stupid (again) or is the equation for solving (--> in this solution wrong? Surely it should be
F + Rcos(60) = 30cos(30)?

that's the same thing

But in their equation, F - 30cos(30) = Rcos(60) so F = Rcos(60) + 30cos(30)

but if it was F + Rcos(60) = 30cos(30) to begin with, F would = 30cos(30) - Rcos(60), which isn't the same as above?

quite right its not - do apologise. wasn't paying full attention. There equation looks right, but why would you draw 2 diagrams for a question?

Hmm I'm not sure :/ I have a feeling that it's wrong but I don't know to be honest! @Zacken could you have a look?

Hmm I'm not sure :/ I have a feeling that it's wrong but I don't know to be honest! @Zacken could you have a look?

It's correct.

If you resolve to the right, you get F - 30 cos 30.

This is the resultant force to the right. The resultant force to the right is also given by R cos 60

So F - 30 \cos 30= R \cos 60.

They've been drawn on different diagrams for a reason, you're treating them as though they are the same diagram.

Good luck for tomorrow guys I'm shitting it as always!!

the forces are not acting in the same direction. You need to draw a force diagram (triangle in this case), showing the forces in series (one after the other). The resultant is the diagonal joining the start point to the end point

sorry for the crap quality but does anyone know how to do this question? I can't find a mark scheme for it anywhere

sorry for the crap quality but does anyone know how to do this question? I can't find a mark scheme for it anywhere

I see, I see. Why do we use two separate diagrams then?

part a) suvat
s=h
A=-9.8
t=5
u=20

Check your s.

What is this from?

true, but as its a distance (not a displacement in this case) it can only have magnitude - but I agree, strictly it should be negative