OCR M1 - 31st May 2012 :)

Smiley Face :)

Haven't seen one of these for this exam... post the M1 problems up on here for OCR ...
:smile:

Reply 1

Genesis2703

5

I'm doing M1 also at this time :biggrin:

It is by far the most difficult out of the 4 units I am doing this summer IMO (m1,s1,d1,c2) because I find it hard to understand what the question is actually asking for, and some of the latter examples are very complicated :/

I have no questions I am doing that I am stuck on at the moment, but GL on your revision! :smile:

Reply 2

Smiley Face :)

OP

Original post by Genesis2703

I'm doing M1 also at this time :biggrin:

It is by far the most difficult out of the 4 units I am doing this summer IMO (m1,s1,d1,c2) because I find it hard to understand what the question is actually asking for, and some of the latter examples are very complicated :/

I have no questions I am doing that I am stuck on at the moment, but GL on your revision! :smile:

Post it up.. lets try and solve it :smile:

Reply 3

PeterStoba

How would I solve this question guys?

I get a = 39.2 ms^-2 and T = 147 N but they don't seem right...

PPQSE.png15.6KB

Reply 4

Smiley Face :)

OP

Original post by PeterStoba

How would I solve this question guys?

I get a = 39.2 ms^-2 and T = 147 N but they don't seem right...

I got a = 2.45m/s/s
AND t = 36.75N

Whats the answer??

Reply 5

raheem94

13

Original post by Smiley Face :)

I got a = 2.45m/s/s
AND t = 36.75N

Whats the answer??

I also get the same answers.

Reply 6

Smiley Face :)

OP

Original post by raheem94

I also get the same answers.

Wooop! First time my answers match with u boss :smile:

Reply 7

PeterStoba

I do not know, the mark scheme is unavailable. I know my answer is wrong.

What method did you use?

Reply 8

raheem94

13

Original post by PeterStoba

I do not know, the mark scheme is unavailable. I know my answer is wrong.

What method did you use?

See the diagram in the spoiler:

Spoiler

Now form 2 equations,
First consider the 5kg particle,

5g-T=5a \longrightarrow (1)

Now consider the 3kg particle,

T-3g=3a \longrightarrow (2)

Now solve

(1) \ \ and \ \ (2)

simultaneously.

(edited 11 years ago)

Reply 9

PeterStoba

I don't see where 7 has came from here? But...

Equation 1 x3, 15g - 21 = 15a
Equation 2 x5, 5T - 15g = 15a

15g - 21 = 5T - 15g
(30g - 21) / 5 = T
T = 54.6?

I must be missing something?

Reply 10

Genesis2703

5

Peter, the 7 was meant to be a T. I think Raheem made a typing error.

Try it again with 5g - T = 5a instead of with a 7 :smile:

Reply 11

PeterStoba

Haha I look like an idiot now! I was honestly confused as to where 7 came from.

Right so now I get the correct answers! Thanks everyone :-)

Reply 12

raheem94

13

Original post by PeterStoba

I don't see where 7 has came from here? But...

Equation 1 x3, 15g - 21 = 15a
Equation 2 x5, 5T - 15g = 15a

15g - 21 = 5T - 15g
(30g - 21) / 5 = T
T = 54.6?

I must be missing something?

Sorry, it was a typo.

Original post by Genesis2703

Peter, the 7 was meant to be a T. I think Raheem made a typing error.

Try it again with 5g - T = 5a instead of with a 7 :smile:

Thanks for clearing the doubt.

Reply 13

Genesis2703

5

Original post by PeterStoba

Haha I look like an idiot now! I was honestly confused as to where 7 came from.

Right so now I get the correct answers! Thanks everyone :-)

haha Don't worry about it man! :smile:

Oh and in class we went over an m1 paper we did for HW/in class, and I got 100%.. but I feel bad because Of course I asked for help on the harder questions, and struggle a lot when left alone. I feel like I am giving the teacher the wrong impression tbh :frown:

(It was the Jan 2011 paper btw)

Reply 14

PeterStoba

Just let him know you got some help on a few of the questions and you don't feel you'd get 100% on your own / another paper?

I think you are all doing OCR? I'm MEI, just realised!

Anything about calculating trajectory etc on your spec?

Reply 15

Genesis2703

5

Original post by PeterStoba

Just let him know you got some help on a few of the questions and you don't feel you'd get 100% on your own / another paper?

I think you are all doing OCR? I'm MEI, just realised!

Anything about calculating trajectory etc on your spec?

Unless you mean angle of the resultant force then no I do not think OCR covers that in M1. You could post a question and see if we know though... but I think we will not understand it :P

Reply 16

ugk4life

Original post by Smiley Face :)

Haven't seen one of these for this exam... post the M1 problems up on here for OCR ...
:smile:

Original post by Genesis2703

I'm doing M1 also at this time :biggrin:

It is by far the most difficult out of the 4 units I am doing this summer IMO (m1,s1,d1,c2) because I find it hard to understand what the question is actually asking for, and some of the latter examples are very complicated :/

I have no questions I am doing that I am stuck on at the moment, but GL on your revision! :smile:

Original post by raheem94

I also get the same answers.

hi guys im also doing this paper. i have a quick question; are we allowed to use this formula for tension - T=mg+ma ? thanks a lot.

Reply 17

raheem94

13

Original post by ugk4life

hi guys im also doing this paper. i have a quick question; are we allowed to use this formula for tension - T=mg+ma ? thanks a lot.

You have to form the equation by considering the situation, there isn't a general formula which will apply to all situations.

Always draw a diagram and resolve the forces, to get the equations.

And by the way, i am not doing this exam.

Reply 18

ugk4life

Original post by raheem94

You have to form the equation by considering the situation, there isn't a general formula which will apply to all situations.

Always draw a diagram and resolve the forces, to get the equations.

And by the way, i am not doing this exam.

ok thanks, my friend told me this formula so i was wondering if this can apply to all situations.

guess ill have to stick with drawing the diagrams and stuff lol.

Reply 19

Smiley Face :)

OP

Original post by raheem94

I also get the same answers.

Hey, Could u helpme out please.
http://www.ocr.org.uk/download/pp_11_jun/ocr_66474_pp_11_jun_gce_4728.pdf

June 11
Q2 part 4
I have got that P will further go up by 0.036 M. I then added this to the 0.36M to get 0.396M.. In order to get the greastest height of P
However the markscheme has said that the greatest height of P is 0.756 M
I don't understand how and why they have got that value...

OCR M1 - 31st May 2012 :)

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