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ALL PHYSICS DOUBTS - POST HERE !!

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holtadit:
Okay people !! Post your IGCSE PHYSICS doubts here so there is one central place for all your queries.

I go first :D


Why does increasing the space between the pins in a light ray experiment improve accuracy ? Put it another way : why should there be such a large gap between each individual pin ?

Amr Fouad:
well that's simple...put ur two index fingers behind each other and try to spot smth infront of u..it's gonna be hard to spot accurately..

now try widening out the space..c the diff?

in other words..to avoid parallex error..

hope that helped.. :)

holtadit:

--- Quote from: Amr Fouad on April 01, 2010, 10:52:24 am ---well that's simple...put ur two index fingers behind each other and try to spot smth infront of u..it's gonna be hard to spot accurately..

now try widening out the space..c the diff?

in other words..to avoid parallex error..

hope that helped.. :)

--- End quote ---

Thanks Amr. Nice analogy !

holtadit:
When calculating the gradient of a line in PAPER 6 a mark is given for drawing a triangle 'more than half the length of the line'.

The examiners report also  refers to the TRIANGLE METHOD alot. What is this method/how does it work.

The only way I know to calc. a gradient is using (y2-y1)/(x2-x1). 

Amr Fouad:
well that's exactly the same..

wut the examiners do is that they use a large triangle (to increase accuracy in taking the averag).. and divide the y-side by the x-side..

so wut u should do is draw the trinagle, divide the vertical length by the horizontal one..

hope that helped again ;D

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