IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => GCE AS & A2 Level => Sciences => Topic started by: MKh on January 14, 2012, 12:15:38 pm

Title: Edexcel A2 Physics Practical paper help needed
Post by: MKh on January 14, 2012, 12:15:38 pm

Assalaamo Alaikum,

I know everyone must be busy but please help me out here.

Doubt 1: How do u guyz tackle the planning questions? I am looking at past papers from the old Spec. to help me with the planning part but i really want help with it. Is there anyone here who has aced this paper? Please share your advices.

Doubt 2: There is always this question that goes along the lines: explain why a graph of ..... against ..... would be straight line. It involves using logs or natural logs (e). I know which one to use -- it will be stated in the question. I know we have to use little math here but is the method same for both logs and lns or is it any different?

Any other advice is always welcome.

Thanks.

Title: Re: Edexcel A2 Physics Practical paper help needed
Post by: Romeesa-Chan on January 14, 2012, 12:30:52 pm

6B ?

Revised the practical investigation papers, did old papers and re-did the new papers.

Title: Re: Edexcel A2 Physics Practical paper help needed
Post by: Deadly_king on January 14, 2012, 02:51:57 pm

I don't know if it's the same thing but in CIE we did these......

https://studentforums.biz/sciences-149/paper-5!!!!!!!!!!!!!!!!/

https://studentforums.biz/sciences-149/physics-paper-5-exam-11012/

Take a look, it might help :)

As for your doubts,

For you to be able to plan, you first really understand what's required of you and what the practical is all about.

Y = mx + C
log Y = mlog X + C
ln Y = mln X + C

If you don't understand, let me know and I'll try to be clearer ;)

Title: Re: Edexcel A2 Physics Practical paper help needed
Post by: MKh on January 14, 2012, 06:00:03 pm

Much appreciated. The links r very helpful. Actually the planning questions in Edexcel Physics are quite similar to those at CIE.

So the method of using logs and ln is the same right?

And do we not have to add 'log' or 'ln' before the 'c' also in the equation y=mx+c?

Thanks once again. :)

Title: Re: Edexcel A2 Physics Practical paper help needed
Post by: Deadly_king on January 14, 2012, 06:07:52 pm

Quote from: MKh on January 14, 2012, 06:00:03 pm

Much appreciated. The links r very helpful. Actually the planning questions in Edexcel Physics are quite similar to those at CIE.

So the method of using logs and ln is the same right?

And do we not have to add 'log' or 'ln' before the 'c' also in the equation y=mx+c?

Thanks once again. :)

Yes, it's the same with log and ln ;)

Actually the log or ln of a constant is another constant ;) So if in the equation it's C, the log or ln of C will be another constant which you can name whatever you want like A....

You're most welcomed :)

Title: Re: Edexcel A2 Physics Practical paper help needed
Post by: Deadly_king on January 14, 2012, 06:11:45 pm

This (https://studentforums.biz/sciences-149/paper-5!!!!!!!!!!!!!!!!/) may help you learn how to answer these sorts of questions ;)

Title: Re: Edexcel A2 Physics Practical paper help needed
Post by: MKh on January 14, 2012, 06:26:18 pm

Thanks :D

Some more doubts please:

Compounding uncertainties

When compounding uncertainties, can we compound the absolute uncertainties involved first or is it necessary that we compound the percentage uncertainties involved?

Although it is not very common in physical investigations, when we add two values, we must add the uncertainties/%uncertaintes involved?

When we multiply two values, then also we add the uncertainties involved or is it any different for this case?

I hope u understand what i m asking here.
Exams r close and u helped. JAZAK ALLAH.

Title: Re: Edexcel A2 Physics Practical paper help needed
Post by: Deadly_king on January 15, 2012, 05:40:31 am

Quote from: MKh on January 14, 2012, 06:26:18 pm

Thanks :D

Some more doubts please:

Compounding uncertainties

When compounding uncertainties, can we compound the absolute uncertainties involved first or is it necessary that we compound the percentage uncertainties involved?

Although it is not very common in physical investigations, when we add two values, we must add the uncertainties/%uncertaintes involved?

When we multiply two values, then also we add the uncertainties involved or is it any different for this case?

I hope u understand what i m asking here.
Exams r close and u helped. JAZAK ALLAH.

I guess you already had these notes :P

https://studentforums.biz/sciences-149/uncertainty-cie-physics/

http://www.saburchill.com/physics/chapters/0068.html

If you don't understand, please let me know :)

Title: Re: Edexcel A2 Physics Practical paper help needed
Post by: MKh on January 15, 2012, 10:04:21 am

Quote from: Nelson Mandela on January 15, 2012, 05:40:31 am

I guess you already had these notes :P
https://studentforums.biz/sciences-149/uncertainty-cie-physics/
http://www.saburchill.com/physics/chapters/0068.html
If you don't understand, please let me know :)

Oh yes, I do. I saw these in late october and saved the webpages as a fav. Forgot about them.
Sorry, my bad.
Thanks for reminding me.

Title: Re: Edexcel A2 Physics Practical paper help needed
Post by: Deadly_king on January 15, 2012, 05:06:53 pm

Quote from: MKh on January 15, 2012, 10:04:21 am

Oh yes, I do. I saw these in late october and saved the webpages as a fav. Forgot about them.
Sorry, my bad.
Thanks for reminding me.

You're welcome :)