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

Reply 720

kiasne

3

do you think i can teach myself this unit and still revise for psychology unit 3 in 6 hours?? lmao help me

Reply 721

JP0458B

16

I saw a couple pages back someone said that if there is a part (i) and (ii) you lose marks if you do it in the wrong order...I'm 95% sure that's wrong, why would you be penalised anyway? You've still shown that you can do it?

Posted from TSR Mobile

Reply 722

Don Pedro K.

9

Original post by NickLCFC

I've checked the mark scheme and I can't really make sense of it.

(Massive diagram ting)

Someone on the interwebs explained it in a way which makes more sense, IMO:

The pipeline runs north-south, going through point (6i, 0j + 0k). You can therefore create a vector equation out of this by doing
r = (6i + 0j + 0k) + x(0i + 1j + 0k) (velocity is 0i + 1j + 0k because the pipeline is running in the j unit direction basically).

Then you can create a second equation using the position of the mast, which goes through the point (0i + 2j + 0k). The "velocity" would be (-1i + -1j + 0k) because the radio mast is south-west to the walker (if you think about going one unit to the left and one down, the direction would be south west).

So you get r = (0i + 2j + 0k) + y(-1i -1j + 0k)

you then set these two equations equal to each other to find where the walker is, work out a value for x or y and sub it into the respective equation (you should get the same answer in either case) to get (6i + 8j)!

Reply 723

Someboady

17

Original post by NickLCFC

Can someone explain how the answer to part a) is (6i + 8j)?

6i is pretty self explanatory from the question.
8j however requires trig. Draw a diagram, and we know that south west is 45 in a downwards left direction. Use trigonometry on the triangle (using 6i) namely the tan function. Then add the 2j. This explanation becomes clear with a diagram.

Reply 724

Someboady

17

Sorry.. i suck at paint

Original post by NickLCFC

I've checked the mark scheme and I can't really make sense of it.

Reply 725

Don Pedro K.

9

Original post by Someboady

6i is pretty self explanatory from the question.
8j however requires trig. Draw a diagram, and we know that south west is 45 in a downwards left direction. Use trigonometry on the triangle (using 6i) namely the tan function. Then add the 2j. This explanation becomes clear with a diagram.

Okay that makes so much more sense hahaha

Reply 726

username1969391

14

Original post by Someboady

Sorry.. i suck at paint

Thanks mate :yy:

Reply 727

Someboady

17

Original post by Don Joiner

I saw a couple pages back someone said that if there is a part (i) and (ii) you lose marks if you do it in the wrong order...I'm 95% sure that's wrong, why would you be penalised anyway? You've still shown that you can do it?

Posted from TSR Mobile

You wouldn't be penalised. I personally do not label my questions. The marker must mark everything legible on your paper.

Reply 728

candol

7

Original post by n2697

I can find the moments for the others but i don't know what to do with X. i worked out that its length is 2root2 but then how do i find its moment, multiply by 2 to get the distance of X from D? i.e. my question is how to get the moment of X?

Didn't think moments with non-perpendicular angles was in M1 but anyway, I guess we need to take moments about D
So (5 x 2) + (3 x 2) = Xcos45 x 2
(this is using force x perp distance)
So 10 + 6 = 2X x rt2/2
16 = X x rt2
16 rt 2 = 2X
so X = 8 rt 2 I guess

Reply 729

wenogk

6

GUYS ANY LAST TIPS BEFORE THE EXAM? :please:

BTW GOOD LUCK! HOPE EVERYONE DOES GOOD :biggrin:

Reply 730

KloppOClock

14

Original post by wenogk

GUYS ANY LAST TIPS BEFORE THE EXAM? :please:

BTW GOOD LUCK! HOPE EVERYONE DOES GOOD :biggrin:

Check if the question says:

speed or velocity
mass or weight
acceleration or decceleration

dont skip steps in long complex calculations, do one step at a time so when you are checking answers you can spot any errors more clearly

good luck to you too!

Reply 731

Tim73

5

Does anyone know how to use the information when something is north west or south west etc in a vectors question? I know it's 45 degrees but idk how that helps.
I can do it when it's north or south or east or west as I know the i/j components are the same. But when it's like north west or something it confuses me
Example question:
GOLD Vectors Question.png

(edited 7 years ago)

Reply 732

math42

20

Does this clash with FP2 again? Was a fun clash for me last year

Reply 733

Tim73

5

Original post by jtlmao

For resolving forces questions is it ok to annotate the diagram? Or do you have to draw a new one out? Basically will you lose marks if you do your working on the diagram given?

Posted from TSR Mobile

No you won't loose marks

Reply 734

particlestudent

13

Original post by Tim73

Does anyone know how to use the information when something is north west or south west etc in a vectors question? I know it's 45 degrees but idk how that helps.
I can do it when it's north or south or east or west as I know the i/j components are the same. But when it's like north west or something it confuses me
Example question:
GOLD Vectors Question.png

When Q is north west of P, the J component will stay the same, but you have to use the negative of the I component from the equation for PQ as it would be on the left. Then equate them.

Reply 735

candol

7

Original post by Tim73

Does anyone know how to use the information when something is north west or south west etc in a vectors question? I know it's 45 degrees but idk how that helps.
I can do it when it's north or south or east or west as I know the i/j components are the same. But when it's like north west or something it confuses me
Example question:
GOLD Vectors Question.png

In this question you can use vector PQ from part b to help you. This vector must equate to k(-I + j) where k is just a constant.
Now equate the i's and the j's to equal -k and k respectively.
Then combine equations and solve for t

Reply 736

saitama kun

2

Original post by candol

Didn't think moments with non-perpendicular angles was in M1 but anyway, I guess we need to take moments about D
So (5 x 2) + (3 x 2) = Xcos45 x 2
(this is using force x perp distance)
So 10 + 6 = 2X x rt2/2
16 = X x rt2
16 rt 2 = 2X
so X = 8 rt 2 I guess

i gt da same answer too fr k

Reply 737

flylikeafly

8

Is there any papers you should do last minute any questions. I have done gold papers and all past papers from 2007-2015 but im still scared, that i could do stupid mistakes in the exam

(edited 7 years ago)

Reply 738

Tim73

5

Original post by candol

In this question you can use vector PQ from part b to help you. This vector must equate to k(-I + j) where k is just a constant.
Now equate the i's and the j's to equal -k and k respectively.
Then combine equations and solve for t

Thanks! I got the right answer :smile:

(edited 7 years ago)

Reply 739

Don Pedro K.

9

Original post by candol

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

In the first part to the solution to this question, it's stated that F = F1 + F2. Why is it possible to state this?

Attachment not found

1.JPG8.6KB

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

Quick Reply

Related discussions

Latest

Trending

Trending

Articles for you