Just done the AQA Physics Practical Watch

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sahmed786
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I just done the as physics prac. It was on resistance and resistrors. the planning exercise was on a rotating table with a slit through it, paint being sprayed through a slit etc. Can someone tell me what they put for the planning excersie, i.e what variable etc, and what they got for value of r1 on last question?
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matt.forster
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i did that too, i varyed the distance between the can and the loop/disk thing, so that the drops slow down, such a dodgy plannig question though, who cares about how fast spray paint goes, apart from chavs maybe! i completely cocked up reading the ammeter, but when i got home, i worked it out to be about 43ohms.
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sahmed786
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(Original post by matt.forster)
i did that too, i varyed the distance between the can and the loop/disk thing, so that the drops slow down, such a dodgy plannig question though, who cares about how fast spray paint goes, apart from chavs maybe! i completely cocked up reading the ammeter, but when i got home, i worked it out to be about 43ohms.
i changed the speed of the turntable, cuz it specifically mentioned the table had "variable speed", did you use speed = distance/time. and sub t wit other equation. also did you say you would plot a graph of;
(distance between can and drops x sT) against Pie D
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matt.forster
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i swear i read it had a constant speed, but the speed of the loop is a more sensible idea since it limits the time that the slit is in line with the paint. i cant remember how i set up my graph. i dont think i scraped a c. oh well, il see what happens on the electricity written, since if i can get 100% in that, i may be able to pull off an a overall. What module did you do in january?
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sahmed786
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(Original post by matt.forster)
i swear i read it had a constant speed, but the speed of the loop is a more sensible idea since it limits the time that the slit is in line with the paint. i cant remember how i set up my graph. i dont think i scraped a c. oh well, il see what happens on the electricity written, since if i can get 100% in that, i may be able to pull off an a overall. What module did you do in january?
i did the unit 2 in january, i managed to get 85 ums marks out of 90 on it. I thnk it was the easiest out of all of the modules. i think im gnna mess up unit 1 more than any. the fundametal particles nonsense isnt sinking in.

Oh btw the variable was the speed of the turntable, i just asked one of my friend whom took it in the second sitting.
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