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Edexcel - M3 - 18th May 2016

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Reply 200

username1162972

Original post by Foutre en L'air

Doing them all, yup!
I haven't sat any FM yet so I just need the normal for the A*

Just get a decent UMS like a C or B then smash the other modules for he A*!

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Reply 201

username1763791

I anyone else just quickly relearning all topics (refreshing it) and then using the physicsmathstutor booklets with past paper questions for each topic?

Reply 202

BBeyond

Original post by Foutre en L'air

I anyone else just quickly relearning all topics (refreshing it) and then using the physicsmathstutor booklets with past paper questions for each topic?

I prefer to just smash through some past papers

Reply 203

Imperion

Original post by Foutre en L'air

I anyone else just quickly relearning all topics (refreshing it) and then using the physicsmathstutor booklets with past paper questions for each topic?

Imo past papers is the best way to go about it... :dontknow:

Reply 204

kkboyk

Original post by Foutre en L'air

Who else feels f****d for this so far?

Original post by Foutre en L'air

I anyone else just quickly relearning all topics (refreshing it) and then using the physicsmathstutor booklets with past paper questions for each topic?

Me lol. I've been struggling with M3 until last week, which I started to go through the book.
I love those booklet so much, sinxe it means I can just focus on my weak areas :tongue:

Reply 205

J.M.Keynes

Could someone look at qu 2 on this paper:

https://8a40d6c38bafca75cc407741c0f3e1889c8e66b2.googledrive.com/host/0B1ZiqBksUHNYWENTbktxdlk5dEU/June%202015%20(IAL)%20QP%20-%20M3%20Edexcel.pdf

Surely if the particle is moving and being accelerated towards the centre of the earth, there is no need for a negative sign. However the markscheme adds a negative sign which leads to mgR^2/x^2 = -ma

Reply 206

username1162972

Original post by J.M.Keynes

Define x as positive the further away it is from earth define a in the same direction. I always do them this way and never get them wrong. Note a=-g at surface and not +g.

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Reply 207

J.M.Keynes

Original post by physicsmaths

Define x as positive the further away it is from earth define a in the same direction. I always do them this way and never get them wrong. Note a=-g at surface and not +g.

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Ok, I think it get it😀

Reply 208

J.M.Keynes

Does anyone know whether we are allowed to draw forces on the diagrams they give us and then refer to them in the question or do we always have to draw our own diagrams

Reply 209

Ayman!

Original post by J.M.Keynes

Does anyone know whether we are allowed to draw forces on the diagrams they give us and then refer to them in the question or do we always have to draw our own diagrams

You can use the given diagram. Don't bother drawing a new one unless you really have to

Reply 210

TheFarmerLad

Is this working acceptable? June '12 Q4b)

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Tried to make it readable

(edited 7 years ago)

image 2.jpeg485.8KB

Reply 211

TheFarmerLad

Also how do you prove the COM of a conical shape?

Reply 212

MaySouth17

What unit does angular speed need to be in? Is it rad/s?

Reply 213

tiny hobbit

Original post by TheFarmerLad

Also how do you prove the COM of a conical shape?

Assuming that you mean a solid cone, use the standard formula for the volume of a solid, using the line y = rx/h

This gives the distance from the vertex.

Reply 214

kkboyk

Does anyone have any tips in getting an A in M3? So far I've managed to move from a U to a B in a week, but can't seem to get into the next grade :frown:

Reply 215

samb1234

Original post by kkboyk

Does anyone have any tips in getting an A in M3? So far I've managed to move from a U to a B in a week, but can't seem to get into the next grade :frown:

If you understand the content, do as many papers as you can - so many of the questions are recycled year after year

Reply 216

kkboyk

Original post by samb1234

If you understand the content, do as many papers as you can - so many of the questions are recycled year after year

I'm planning on starting past papers from Jan 2002 tomorrow. Also how would you go about solving vertical circle questions in which a particle leaves the circle?

Reply 217

samb1234

Original post by kkboyk

I'm planning on starting past papers from Jan 2002 tomorrow. Also how would you go about solving vertical circle questions in which a particle leaves the circle?

Leaves when R=0, then it's just a projectile question

Reply 218

Ayman!

Original post by kkboyk

Also how would you go about solving vertical circle questions in which a particle leaves the circle?

Assuming your reaction force/tension is in terms of an arbitrary angle, it's just T = 0 (when string goes slack - won't happen for a rod) or R = 0. June 13 and June 13 R is are good examples.

Could you do me a favour and tell me which ones between 2002 and 2005 are worth doing once you get started, if it's not too much trouble? :colondollar: