Edexcel Mechanics M1 2018 Unofficial Mark Scheme

Oh right I've done the method the same but got 7.41 so probs wont get any marks out of 10 ugh. Thanks for your time

No,you'll probably get method marks for your equations but no A or B marks where you've used 30 degrees instead of 50.

I find it really difficult to see how they're going to allocate 10 marks since my solution is really short - 5 lines if you ignore splitting the vector form into two separate equations. It's three equations (parallel and perpendicular to the slope) and F = μR, then simply solve.

So three M1 and 2 B1 marks there. Perhaps an M1 mark for taking friction in the right direction? Then an A1 for the final solution. Where do the other 3 marks go?? I've no idea and will be interested to see the eventual mark scheme.

Reply 641

MclarenP1

9

Original post by Reesharr

No,you'll probably get method marks for your equations but no A or B marks where you've used 30 degrees instead of 50.

I find it really difficult to see how they're going to allocate 10 marks since my solution is really short - 5 lines if you ignore splitting the vector form into two separate equations. It's three equations (parallel and perpendicular to the slope) and F = μR, then simply solve.

So three M1 and 2 B1 marks there. Perhaps an M1 mark for taking friction in the right direction? Then an A1 for the final solution. Where do the other 3 marks go?? I've no idea and will be interested to see the eventual mark scheme.

Thank you very much sir If I get 5/10 in that question I will be very satisfied feel much better now.

Reply 642

JSC16

14

How many UMS will 63 give or take 2 marks be roughly?

Reply 643

zMarshaall

8

Original post by MclarenP1

My method for question 2 was correct but I got 7.41 for P as I used 30 degrees instead of 50 how many marks am I likely to get out of 10.
Please reply its bugging me a lot.

I couldn’t say for sure but I know that there’ll be something in the examiner’s notes about if people used 30 degrees instead of 50, worst case scenario you might get 4/10 but best case I’d say 7/10, just try to nail your core modules and you’ll be fine trust me! I did absolutely horrible on this paper but my other modules bring my grade up, and I still have a good chance at getting an A, even though this paper was probably a D for me, any marks made on this paper you can just count as bonus marks really

Reply 644

MclarenP1

9

Original post by zMarshaall

I couldn’t say for sure but I know that there’ll be something in the examiner’s notes about if people used 30 degrees instead of 50, worst case scenario you might get 4/10 but best case I’d say 7/10, just try to nail your core modules and you’ll be fine trust me! I did absolutely horrible on this paper but my other modules bring my grade up, and I still have a good chance at getting an A, even though this paper was probably a D for me, any marks made on this paper you can just count as bonus marks really

Thank you very much mate am motivated to work harder now

Reply 645

zMarshaall

8

Original post by JSC16

How many UMS will 63 give or take 2 marks be roughly?

Mid 80’s I’d say

Reply 646

ymp16

5

In Q7 I put a= 1.2 instead of 1.18 as g=9.8 (2sf so I wrote the result to 2sf)
Then used 1.2 for the next part and didn't get the result given but correct method
How many marks would I drop there?

Reply 647

Blubble

1

It went horrifically got about 44/75 give or take a couple marks probably an E right ?

Reply 648

MclarenP1

9

Original post by Blubble

It went horrifically got about 44/75 give or take a couple marks probably an E right ?

Can be a C no

Reply 649

Daniel111111

6

Original post by MclarenP1

Seems like you are an expert you got 74 and also for the second question do you think any method marks are available taking the cos angle 30 instead of 50

Not sure.

Reply 650

Daniel111111

6

Original post by BenHayward00

Pretty sure for 7a) it’s P: 16gm/5 - T =4ma
Cos it’s 4m x cosa and cosa = 4/5
And acceleration is 1.18ms-2 cos you have to divide yours by 5

I got 3g/25 but forgot the 2 in my post. Sorry

Reply 651

Daniel111111

6

Original post by keeg

I agree with everything here. For question 3 i got 2898. i don't know if they're the same.

Would need to have been rounded as you used a value for g. I think you would lose 1 mark

Reply 652

tiny hobbit

15

Original post by JSC16

Guys I have a serious problem and need some advice, for the lift question how many marks would I lose for using 1000N rather than 10000N in my working, I ended up with -2 but if I used 10000 I would have got 6.97

Provided that you used 1000 right from the beginning (and 10000 is not seen in your working) then it will be treated as a MR and you will lose 2 marks in total.

Reply 653

tiny hobbit

15

Original post by Reesharr

No,you'll probably get method marks for your equations but no A or B marks where you've used 30 degrees instead of 50.

I find it really difficult to see how they're going to allocate 10 marks since my solution is really short - 5 lines if you ignore splitting the vector form into two separate equations. It's three equations (parallel and perpendicular to the slope) and F = μR, then simply solve.

So three M1 and 2 B1 marks there. Perhaps an M1 mark for taking friction in the right direction? Then an A1 for the final solution. Where do the other 3 marks go?? I've no idea and will be interested to see the eventual mark scheme.

When virtually the same question was asked in January 2003, there was M1 A2 for each equation, where the wrong angle would count as an accuracy error, M1 for the use of F = mu R, M1 for eliminating R to get an equation in just P, M1 for solving for P, A1 for the correct answer. So someone using 30 instead of 50 would lose a mark for each equation and then the A mark at the end, 7/10. If they had friction going the wrong way, that would lose another A mark onthe "parallel to the plane" equation.

Reply 654

MclarenP1

9

Original post by tiny hobbit

When virtually the same question was asked in January 2003, there was M1 A2 for each equation, where the wrong angle would count as an accuracy error, M1 for the use of F = mu R, M1 for eliminating R to get an equation in just P, M1 for solving for P, A1 for the correct answer. So someone using 30 instead of 50 would lose a mark for each equation and then the A mark at the end, 7/10. If they had friction going the wrong way, that would lose another A mark onthe "parallel to the plane" equation.

WOW that is mental maaan I put 30 degrees and had friction in the right way with three equations however I did a calculation error (due to my calculator being in radians mode)