Help: struggling with mechanics

Examsolutions?

Is this the book you have?

http://www.alibris.co.uk/search/books/isbn/9780435519162&cm_mmc=shopcompare-_-paid-_-Google-_-books?ci_src=18615224&ci_sku=15645251&gclid=CIq3i7uBiLoCFTIQtAod-y8AEg

If not, probably get that one. Looks up-to-date to me, though I do OCR MEI, not Edexcel.

I don't think he explains everything in the edexcel syllabus, because I have checked out his videos and it misses out some stuff it seems

Like what?

Perhaps try MyMaths

Erm an example was a particle at the point of slipping on a plane inclined from the horizontal. It's not included in any of his videos, atleast I don't think so

I use this one for M1 and then the C1+2 versions of them and think they are very good as they give you worked examples of every question in the book on a CD and it is quite good at explaining things IMO

http://www.amazon.co.uk/gp/product/0435519166?ie=UTF8&force-full-site=1&ref_=aw_bottom_links


Posted from TSR Mobile

Can you post the question? Think of this in real life, it helps. You should realise that if you are pushing it up slightly, and therefore particle about to go up the plane, friction is pushing the particle down the plane. What I then would do is draw a free-body diagram of the particle with the forces on it whatever their direction e.g. downwards or up etc. The particle doesn't have to b drawn so accurately, so I draw it as a circle. Then I draw another diagram of this circle, but this time I have on it the components of all forces in the previous diagram. These components are parallel or perpendicular to the plane. Then it's usually just a case of resolving, using F=ma or/and even SUVAT

Practice makes perfect, seriously from experience.

Yep someone else also recommended this book, and I realised it's the same as the C1 book we have which explains things pretty well so i've already ordered it, cheers for the input though

THE ANSWER IS 460 seconds- how would we get to that?

Thanks in advance

For future reference, it would be better if you'd started a new thread, rather than post on the tail end of someone else's - fewer people will check it out, thinking it's already been looked at.

Having said that. Did you manage to get an answer different from the given one, as I got 433 1/3 seconds?

Okay, thanks. No I didn't get that answer. I drew it out as a graph but apart from the two triangles and the square there are meant to be two rectangle shapes where the velocity flatlines to deccelerate at the beginning and accelerate at the end. I think we are meant to work out the areas and take them away from 7200 to get the area of these two triangles and find their times then, but I don't get 460 seconds, I get around 370 seconds....

I was assuming that the section restricted to 10m/s was in the area where it was travelling at 30m/s

Whenever the train changes speed it will accelerate/decelerate.

Can you do a diagram of what the shape is / should be.

If you're using windows, you can do it in Paint, and just save it as a jpeg and upload.

Thanks, yes, the graph is attached, note the two sections ( rectangles) are equal