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# Edexcel - M3 - 18th May 2016 watch

1. (Original post by BBeyond)
The max part is but not the min?
I haven't done the question, just looked at it. I will do it later on today and let you know what I have done.

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2. Me right now running away from all my M3 problems.

I'm f***ed
3. Is it just an application of F<= Fmax
4. (Original post by J.M.Keynes)
Hey guys I don't understand question 3b june 14 R: https://8a40d6c38bafca75cc407741c0f3...%20Edexcel.pdf

The examiners report says that the inequality is: tension <= frictional force + weight force down plane. But surely if tension is less that the two forces, it will keep on sliding down the plane?
The frictional force is variable, up until fr=frmax. So it's at equilibrium where the component of the weight plus the frictional force equals the tension.
5. With vertical elastic strings, how do I determine the direction of the acceleration? If the particle is pulled down from its equilibrium position, is the acceleration then downwards? And vice versa, if it is pulled up from its equilibrium position is the acceleration upwards?
With vertical elastic strings, how do I determine the direction of the acceleration? If the particle is pulled down from its equilibrium position, is the acceleration then downwards? And vice versa, if it is pulled up from its equilibrium position is the acceleration upwards?
x (dot dot) = -w^2x

Acceleration is always in the opposite direction to displacement, that's the condition for SHM.
7. Does anyone else think the international papers are much harder than the normal ones?
8. (Original post by harry734)
Does anyone else think the international papers are much harder than the normal ones?
Definitely, they're good for preparation though

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9. (Original post by Student403)

Me right now running away from all my M3 problems.

I'm f***ed
You'll be fine

By fine I mean 100 UMS

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10. (Original post by Euclidean)
You'll be fine

By fine I mean 100 UMS

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Thanks bro I wish Some of these COM questions with the wacky moments/geometry are just killing me
11. (Original post by Student403)
Thanks bro I wish Some of these COM questions with the wacky moments/geometry are just killing me
I'm leaving any of that kind of question to the end if it comes up haha
12. (Original post by Student403)
Thanks bro I wish Some of these COM questions with the wacky moments/geometry are just killing me
Yeah the moments is potentially what could finish me, when the weight has two component moments about the axis...

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13. (Original post by samb1234)
I'm leaving any of that kind of question to the end if it comes up haha
(Original post by Euclidean)
Yeah the moments is potentially what could finish me, when the weight has two component moments about the axis...

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All we can do is hope! Are you guys UK or IAL?
14. (Original post by Euclidean)
Definitely, they're good for preparation though

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Yeah, just making sure it's not just me haha
15. What is happening in the second step in the attached solution? Question is 2b from Jan 2011. Where are they getting lambda/(7+lambda) from?
Attached Images

16. (Original post by Euclidean)
Yeah the moments is potentially what could finish me, when the weight has two component moments about the axis...

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Oh do people take two moments. Hm i just extend the line of weight and find the perpendicular distance.

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17. (Original post by Student403)
Thanks bro I wish Some of these COM questions with the wacky moments/geometry are just killing me
Do the exercises from the book!
18. Is this fine doing this
Q2 aJune 15 IAL. I set x increasing away from earth so force is negative and a=-g.
What is happening in the second step in the attached solution? Question is 2b from Jan 2011. Where are they getting lambda/(7+lambda) from?
I posted a solution to this yesterday let me find the post

there u go

on the first line of working the cos30 is cut out for some reason but it should say cos30 after the brackets
20. (Original post by BBeyond)
I posted a solution to this yesterday let me find the post

there u go
Cheers!

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