# Amazing notes for physics paper 6!!

Discussion in 'Cambridge IGCSE' started by balloonsandhighlighters, May 28, 2012.

1. ### balloonsandhighlighters

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Centre of mass experiment (with the lamina): How to minimize inaccuracy when marking the lines : you view the string directly in front of card.

Why angle i is NOT equale to angle r in ray experiment:

- thickness of pins
-thickness of mirror
-protractor is not precise

In an experiment to do with the cooling of water, there are certain things which must be kept the same:

- initial temp.
-thickness of test-tubes ( more heat lost when thinner etc.)
-vol. of water
-thickness of cotton wool
-depth of the thermometer in the water
-avoid droughts

Examples of insulators that you can wrap things with:
-bubble wrap
-fiberglass
Styrofoam is a good insulator , however you cannot wrap it around things as it breaks easily.

inaccuracy of ray box method: thickness of rays.
inaccuracy of pin method: pins not straight, or too close, or thickness of lines drawn.

Symbol for extension is 'x' or 'e'.

A ruler is called a 'rule'.

ALWAYS ROUND TO 3.SIG.FIGS.

To improve accuracy, put pins in the light ray experiment FURTHER APART to avoid parallax error. So, I I I is better than I I I (where I is the pins)

Precautions for circuit readings of I and V so that accurate:

For I specifically :
-limit current so that temp. doesn't increase
-use a tapping meter

For I and V: Switch off between readings.

θ this is the symbol for Celsius temp. (theta)
T this is the symbol for Kelvin temp.

In light ray experiment, lengths are in mm.

Fair test for pendelum experiments:
-length of pendelum
-shape of bob
-no. of swings
-amplitude

If a statement is 'directly proportional', the justification would always be , ''straight line that goes through the origin''.

If you're comparing the extensions of springs of different materials, certain things have to be the same:
-the cross-section of the springs
-the length of the springs
-the room temperature

How to reduce the heating effect of current:

-reduce current
-reduce voltage or power

Precautions for focal length experiments:
-do it in a darkened room
-clamp ruler to bench
-avoid parallax error when reading the lengths
-make sure that the obejct/lense/screen are all perpendicular to bench.
-and of course, repeats.

A question one came up and asked to draw a diagram of a load on a ruler on a pivot. Well, this meant that the ruler was unbalanced, and so this means that when you draw it, you must show that the ruler is tilted.

DON'T FORGET TO WRITE DOWN THE UNITS AFTER EACH ANSWER!!!

An important precaution for spring experiments is to wait for the spring to stop moving and then record the length.

There you go! Thats it! These are my notes that i made using past papers! Just pray for me and the others! Inshallah we all get good grades! Ameeeen

3. ### Afraah

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OMG THANKS A BUNCH!
This really got me thru a lil notes here x) thankiess <3

Good Luck to u to

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4. ### сᴏᴏʟ сяуѕтᴀʟѕXPC UserWith Red Ribbon

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Assalam-o-alaikum wr wb...
Jazakallah Khair for sharing and Aameen!

May Allah give all of us success in this world as well as the Hereafter

5. ### Modar

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Thank You so much for the notes, but i'm stuck in one question, W08qp6, q2a please tell me how to draw please

6. ### Afraah

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btw uhm bout this --> If you're comparing the extensions of springs of different materials, certain things have to be the same:
-the cross-section of the springs
-the length of the springs
-the room temperature <-- uhm this one's wrong btw, ive done a question and in the marking scheme they say to ''regect it'' =| U could add however: Number of coils/Range of loads/lenght of wire/Number of coils.... etc..

7. ### Afraah

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ohh opps repeated the ''nmbr of coils''

8. ### сᴏᴏʟ сяуѕтᴀʟѕXPC UserWith Red Ribbon

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Assalam-o-alaikum wr wb ..

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9. ### kainat husain

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THANK U DEAR MAY ALLAH BLESS U WITH GOOD GRADES

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10. ### Dsilentkila

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Ameen!
ur awesome !
one lil question .
M/J 2010, q4, b(iv) onwards.
i dont get it.

11. ### kainat husain

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12. ### Modar

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wa 3alaykum al salam
thank you so much, and how did u draw it

13. ### сᴏᴏʟ сяуѕтᴀʟѕXPC UserWith Red Ribbon

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V is 'normally' in parallel...but in this case you have to draw EXACTLY what's there in the question...and it won't be attached to the resistance wire, cuz in the original diagram it isn't

and sure..lemme have a look

it's okie...no need to thank and i used paint..

14. ### kainat husain

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ahan thank u so much! yes pls help me in tht

15. ### сᴏᴏʟ сяуѕтᴀʟѕXPC UserWith Red Ribbon

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16. ### sweeet bee

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really superb!!!! thanx 4 posting.........

17. ### kainat husain

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the last drawin! they are askin to attach an additinal lead so that its connected between A AND D but i dun see any similarity :/ like abt wht is asked :/ pls can u clear

18. ### сᴏᴏʟ сяуѕтᴀʟѕXPC UserWith Red Ribbon

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well....if you see the question..i.e circuit 2...in that resistor A and D aren't connected...in the above diagram, they are! how are they? with an additional lead

19. ### kainat husain

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okk but if u c the above diagram circuit 2...its different like the wire is not staraight and they r askin to connect a lead between A and D but in ur diagram how will we b able to c tht?

20. ### сᴏᴏʟ сяуѕтᴀʟѕXPC UserWith Red Ribbon

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in circuit 2...if you see, AB and BC are both in series where as CD is parallel to both...take this information into consideration and make another circuit diagram.
did you get it now?

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