Physics P5 in 5 minutes !!!

[Taci12]

Yeah, I am!

 

[Saloon]

Yeah, I am!

Well then good luck to you too

 

[yashmehta96]

can you all guyz look at question 1 in november 2010 paper 52 .
so that we discuss it .

 

[yashmehta96]

here's a revision note for 9702 physics paper
Question 1:
first be able to reduce the equation in the simplest form ..i.e y=mX=c ..and recognize the gradient
calculate the data in 3 s.f(generally done) or to one s.f more or equal to the s.f of the raw data
in case of logarithmic calculations, the number of d.p is the number of s.f ..hence for a raw data of 3 s.f the log should be calculated to 3 or 4 d.p
to calculate absolute uncertainty the most accepted method is to calculate the maximum difference and divide by 2 ..sf of uncertainty is usually ignored in the mark scheme but stick to 1 or 2 s.f
plot all the six points,a small encircled dot is acceptable use sharp pencil to plot , and draw the error bars. all to nearest half square on the grid.
(u can also analyze from the graph as how much s.f to use..as the graphs interval's points's tenth division place is to be plotted )
the gradient should be calculated by drawing a triangle and mentioning the points of the vertices in the best-fit line ..the hypotenuse should be greater than halt the length of the best-fit line.
working should be shown clearly
and the worst-fit line is drawn by joining the top of the topmost point's error bar and the bottom of the bottommost error bar..and the line should touch every error bar.
both line should be clearly LABELLED ,and the gradient of worst-fit is calculated in similar way to best-fit ..calculate it on the blank page at the end..and just show the gradient value in working area while calculating the uncertainty in gradient..
the error in gradient is gradient of best fit - gradient of worst fit ,or 1/2 * (steepest line's gradient - shallowest line's gradient)
all calculation to 3 s.f
and for calculations , which is usually related to the calculated gradient, take care of units, power of tens and to calculate the percentage uncertainty work out the value with the gradient and again with the error+the gradient and work out the difference which is the absolute uncertainty , hence calculate the percentage uncertainty .(working is only credited here and calculations are not checked)
Question 2:
state the basic statement, it is awarded 1 mark..such as change pressure and measure power..and repeat(o/n 05)
Draw a diagram with all the equipment you might use during the experimentation of this plan..a basic, well labelled diagram could score many marks; even if the explanation is weak.
identify the control variable
make sure you know the working of some equipments as:
collimator,sonometer, strobe, bourdon gauge, joule meter,thermometers,light-spot galvanometer needle valve, vacuum grease , lightgate, smart pulley ,balance,newton meter,ticker tape data-loggers , optical bench, set squares etc.. don't panic of you don't but u should know what equipment to use to measure something.
make sure u understand the question and collect all the method marks by suggesting means of measuring the quantities u might measure during the experiment.
there are 5 method marks to be scored.
now beware of safety measures. like earmuffs eardrums, goggles , safety screens . sand bucket for falling masses..etc
now be able to point some additional details they are worth 4 marks.
these can also be awarded on a detailed diagram..
suggest the possible ranges of devices, suggest some ways of sophisticating the experiment..but donot make vague references and do not forget why are u performing this experiment .
Best of luck . :Yahoo!: bineetojha

thnx for the summarised notes .

 

[Taci12]

can you all guyz look at question 1 in november 2010 paper 52 .
so that we discuss it .

I've just worked it out. What do you wish to discuss?

 

[xyz!]

here's a revision note for 9702 physics paper
Question 1:
first be able to reduce the equation in the simplest form ..i.e y=mX=c ..and recognize the gradient
calculate the data in 3 s.f(generally done) or to one s.f more or equal to the s.f of the raw data
in case of logarithmic calculations, the number of d.p is the number of s.f ..hence for a raw data of 3 s.f the log should be calculated to 3 or 4 d.p
to calculate absolute uncertainty the most accepted method is to calculate the maximum difference and divide by 2 ..sf of uncertainty is usually ignored in the mark scheme but stick to 1 or 2 s.f
plot all the six points,a small encircled dot is acceptable use sharp pencil to plot , and draw the error bars. all to nearest half square on the grid.
(u can also analyze from the graph as how much s.f to use..as the graphs interval's points's tenth division place is to be plotted )
the gradient should be calculated by drawing a triangle and mentioning the points of the vertices in the best-fit line ..the hypotenuse should be greater than halt the length of the best-fit line.
working should be shown clearly
and the worst-fit line is drawn by joining the top of the topmost point's error bar and the bottom of the bottommost error bar..and the line should touch every error bar.
both line should be clearly LABELLED ,and the gradient of worst-fit is calculated in similar way to best-fit ..calculate it on the blank page at the end..and just show the gradient value in working area while calculating the uncertainty in gradient..
the error in gradient is gradient of best fit - gradient of worst fit ,or 1/2 * (steepest line's gradient - shallowest line's gradient)
all calculation to 3 s.f
and for calculations , which is usually related to the calculated gradient, take care of units, power of tens and to calculate the percentage uncertainty work out the value with the gradient and again with the error+the gradient and work out the difference which is the absolute uncertainty , hence calculate the percentage uncertainty .(working is only credited here and calculations are not checked)
Question 2:
state the basic statement, it is awarded 1 mark..such as change pressure and measure power..and repeat(o/n 05)
Draw a diagram with all the equipment you might use during the experimentation of this plan..a basic, well labelled diagram could score many marks; even if the explanation is weak.
identify the control variable
make sure you know the working of some equipments as:
collimator,sonometer, strobe, bourdon gauge, joule meter,thermometers,light-spot galvanometer needle valve, vacuum grease , lightgate, smart pulley ,balance,newton meter,ticker tape data-loggers , optical bench, set squares etc.. don't panic of you don't but u should know what equipment to use to measure something.
make sure u understand the question and collect all the method marks by suggesting means of measuring the quantities u might measure during the experiment.
there are 5 method marks to be scored.
now beware of safety measures. like earmuffs eardrums, goggles , safety screens . sand bucket for falling masses..etc
now be able to point some additional details they are worth 4 marks.
these can also be awarded on a detailed diagram..
suggest the possible ranges of devices, suggest some ways of sophisticating the experiment..but donot make vague references and do not forget why are u performing this experiment .
Best of luck . :Yahoo!: bineetojha

hey thnx! cn u pls give me a summary of some equipments and their uses? pls..!
thnx!

 

[yashmehta96]

I've just worked it out. What do you wish to discuss?

can you post your response about 1 st question .

 

[Wanzi21]

can someone explain the question 2 on how to get the value of T and T^2 (its uncertainty as well)? pls help
http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_s10_qp_52.pdf

 

[Taci12]

can you post your response about 1 st question .

Here's it. Sorry, it's a little messy.

 

[Taci12]

can someone explain the question 2 on how to get the value of T and T^2 (its uncertainty as well)? pls help
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s10_qp_52.pdf

Use the given formula to find T. To find T^2, simply square.

fractional uncertainty in T^2= 2 x fractional uncertainty in t

 

[Wanzi21]

I just want to erase my doubt that can I use an answer like this (12±2) x 10^2 ? for gradient I meant

 

[Goku]

Silly question,but can anyone tell me how to use a gradient triangle? I have a feeling I've been doing it wrong . .
Thanks!

 

[Saloon]

Silly question,but can anyone tell me how to use a gradient triangle? I have a feeling I've been doing it wrong . .
Thanks!

After you draw your line just pick any point on the line, not necessarily what you used to plot just any point on the line, then draw a triangle... The triangle should be at least half the length of your line drawn
Then just use the formula gradient=(y2-y1)/(x2-x1)

 

[manu94]

When calculating the error in the gradient do we need to draw construction lines to show that we calculated the gradient for the worst acceptable line?

 

[bamteck]

Need help for the design part on Beta particles !
Can someone please help me for a diagram please ?
http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_s04_qp_5.pdf

 

[Saloon]

When calculating the error in the gradient do we need to draw construction lines to show that we calculated the gradient for the worst acceptable line?

Yes

 

[InnocentAngel]

What is the difference between controlled variable and constant variable???

 

[InnocentAngel]

Use the given formula to find T. To find T^2, simply square.

fractional uncertainty in T^2= 2 x fractional uncertainty in t

Can't we do : ( upper limit of T^2 - lower limit of T^2 ) /2 ??? Does it give the same answer always??

 

[Varuna0911]

for June 2012 p52 Q2 d(ii) and e(ii) could u help me please?

 

[Taci12]

Can't we do : ( upper limit of T^2 - lower limit of T^2 ) /2 ??? Does it give the same answer always??

Usually use that formula for functions like log or ln. But try it and see if you get the same answer, then it's no prob