You are Here: Home >< Maths

Mega A Level Maths Thread MK II watch

1. (Original post by MathsNerd1)
Well the thing I tend to struggle with is the Work-energy principle as I'd rather just use M1 techniques as I can't get the concept straight in my head yet, everything else tends to be alright
Ah yes the work-energy principle, I can't say I remember how to do it but I remember that I didn't know how to do it properly when we covered it in class, and then I went over it at home during revision and it made sense, what about it do you not understand?
2. (Original post by Anythingoo1)
Ah yes the work-energy principle, I can't say I remember how to do it but I remember that I didn't know how to do it properly when we covered it in class, and then I went over it at home during revision and it made sense, what about it do you not understand?
Yeah its quite annoying for me really and I understand the equations for the 2 different parts of Gain/Loss in PE = mgh where h is the vertical height and where the Gain/Loss in KE = 1/2mu^2, the main problem I find I have is working out when Work is done by friction on which side it goes on, after I've got that sorted then I'll have that entire part down and they shouldn't really throw me off if one came up in June.
3. (Original post by MathsNerd1)
Yeah its quite annoying for me really and I understand the equations for the 2 different parts of Gain/Loss in PE = mgh where h is the vertical height and where the Gain/Loss in KE = 1/2mu^2, the main problem I find I have is working out when Work is done by friction on which side it goes on, after I've got that sorted then I'll have that entire part down and they shouldn't really throw me off if one came up in June.
Oh yeah ok I remember, just remember if it's an inclined plane, then in the ball is going up the slope, friction is acting down the slope, if the ball is falling down the slope, friction is acting up the slope
4. (Original post by Anythingoo1)
Oh yeah ok I remember, just remember if it's an inclined plane, then in the ball is going up the slope, friction is acting down the slope, if the ball is falling down the slope, friction is acting up the slope
Oh okay, so is the work done by friction just in the direction that friction acts upon?

So for an example if you're going up the plane the equation would be
Loss in KE = Gain in PE + WD by friction? Or would the work done be on the other side of the equation?
5. (Original post by MathsNerd1)
Oh okay, so is the work done by friction just in the direction that friction acts upon?

So for an example if you're going up the plane the equation would be
Loss in KE = Gain in PE + WD by friction? Or would the work done be on the other side of the equation?
Hey it can never be in the other side of the equation (and still be positive). The LHS is the energy that will be transferred and the RHS is the energy that it has been transferred to. And energy is not a vector quantity so you can neglect any direction.

Posted from TSR Mobile
6. (Original post by Anythingoo1)
85 is pretty good! Erm the moments definitely get more complicated, but there is a pattern to the questions which makes it easier
Thanks, yeah... I have a loooooooong time anyway to perfect it!
7. Guys I have a question about histograms.... I know the data has to be continuous so there can be no gaps between the class boundaries. Therefore if it's to the nearest pound (for example), then we use the boundary £1.50-£2-50. However, what happens when the data starts at 0? Do we use 0.50-1.50 or just 0-£1.50?Thanks!
8. (Original post by StUdEnTIGCSE)
Hey it can never be in the other side of the equation (and still be positive). The LHS is the energy that will be transferred and the RHS is the energy that it has been transferred to. And energy is not a vector quantity so you can neglect any direction.

Posted from TSR Mobile
I think I understand it now, thanks for the help as well as anythingoo1

Posted from TSR Mobile
9. (Original post by GCSE-help)
Guys I have a question about histograms.... I know the data has to be continuous so there can be no gaps between the class boundaries. Therefore if it's to the nearest pound (for example), then we use the boundary £1.50-£2-50. However, what happens when the data starts at 0? Do we use 0.50-1.50 or just 0-£1.50?Thanks!
Interesting question
Have you come across a problem regarding it? If so post the question also. Most times the question will guide you, I guess

Posted from TSR Mobile
10. Anyone help me on how to finish this q -

It's q6 and there's one final bit to simplify it but I don't understand how it's arrived at it - the answer is y =100x^3

Posted from TSR Mobile
11. (Original post by krishkmistry)
Anyone help me on how to finish this q -

It's q6 and there's one final bit to simplify it but I don't understand how it's arrived at it - the answer is y =100x^3

Posted from TSR Mobile

Posted from TSR Mobile
Attached Images

12. Can someone help me with S1 .

Watch this exam solution video/ question c

I don't understand part C. Here's the Question Paper, its Q3 part C

13. (Original post by Xx4L3x)
Can someone help me with S1 .

Watch this exam solution video/ question c

I don't understand part C. Here's the Question Paper, its Q3 part C

The sales for the top 75% of months would be the lower quartile and above.

The lower quartile is £7000. This means that the top 75% of months had an amount received of greater than £7000 rather than £10000, so there is no basis for the company's claim.
14. (Original post by justinawe)
The sales for the top 75% of months would be the lower quartile and above.

The lower quartile is £7000. This means that the top 75% of months had an amount received of greater than £7000 rather than £10000, so there is no basis for the company's claim.
75% = UQ though ~?????
15. (Original post by Xx4L3x)
75% = UQ though ~?????
That's the 75th percentile, or the top 25%.

You want the TOP 75%, so that's 25th percentile (lower quartile) and up.
16. Is there something as error carried forward? And what do they do?
17. Been panicking about this but in core 2 exams - if you leave your answer with an ellipsis at the end indicating an accurate figure - would you get full marks - that's if they don't ask how accurate you need to be.

Posted from TSR Mobile
18. (Original post by MAyman12)
Is there something as error carried forward? And what do they do?
It means that if you make a mistake at the beginning of a question, or say in part a), and then you use that answer later on to do something else in theory you shouldonly be penalised once if the rest of your method is correct. In general, certainly for AQA they tend to use 'show that' questions if they think you will need the answer later on, don't know what the other exam boards do though.

Posted from TSR Mobile
19. (Original post by furryface12)
It means that if you make a mistake at the beginning of a question, or say in part a), and then you use that answer later on to do something else in theory you shouldonly be penalised once if the rest of your method is correct. In general, certainly for AQA they tend to use 'show that' questions if they think you will need the answer later on, don't know what the other exam boards do though.

Posted from TSR Mobile
That's a bummer I'm on edexcel though.
20. Hai, I'm doing S1 on Friday and need some last minute help!

It's edexcel June 2010 and I'm stuck on 3e, 4e and 6f.
Any help greatly appreciated
Attached Images

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: July 10, 2013
Today on TSR

The most controversial member on TSR?

Who do you think it is...

Is confrontation required?

Discussions on TSR

• Latest
Poll
Useful resources
Discussions on TSR

• Latest

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE