Qualification > Sciences
AS Physics Prac Query
Deadly_king:
--- Quote from: $!$RatJumper$!$ on October 29, 2010, 06:39:34 pm ---Thats nice to hear it was easy :)
umm jus a question, what were the errors and improvements for that prac?
--- End quote ---
These were pretty much easy :
Errors
1. Two sets of readings were not enough to draw a valid conclusion.
2. The amount of water which is to be leaked out was small and hence rapid such that it was difficult to judge when the water has passed the line.
3. The bottle was not horizontal and each time we set the bottle it was not inclined at the same angle.
4. Water is a colourless liquid such that it does not have a good contrast.
Improvements :
1. Take more readings and plot a suitable graph as a means of averaging.
2. Use a larger bottle such that it takes more time, hence reducing % uncertainty in the measurement of time.
3. Make use of a spirit level to keep the bottle horizontal.
4. Make use of a dyed solution which will have a better contrast such that values can be taken more accurately.
$!$RatJumper$!$:
--- Quote from: Deadly_king on October 30, 2010, 04:41:09 am ---These were pretty much easy :
Errors
1. Two sets of readings were not enough to draw a valid conclusion.
2. The amount of water which is to be leaked out was small and hence rapid such that it was difficult to judge when the water has passed the line.
3. The bottle was not horizontal and each time we set the bottle it was not inclined at the same angle.
4. Water is a colourless liquid such that it does not have a good contrast.
Improvements :
1. Take more readings and plot a suitable graph as a means of averaging.
2. Use a larger bottle such that it takes more time, hence reducing % uncertainty in the measurement of time.
3. Make use of a spirit level to keep the bottle horizontal.
4. Make use of a dyed solution which will have a better contrast such that values can be taken more accurately.
--- End quote ---
Cool :) thank for that..
so no parallax error at all in this experiment?
Deadly_king:
--- Quote from: $!$RatJumper$!$ on October 30, 2010, 05:26:13 am ---Cool :) thank for that..
so no parallax error at all in this experiment?
--- End quote ---
Ooh.........you can add parallax as well in measuring the diameter of the bottle though you were given two sets square to prevent that.
I was told by a teacher to try be unique and use parallax only in emergency ;)
$!$RatJumper$!$:
I see.. ok so what types of experiments would you use parallax? I get confused because in experiments where its VERY evident parallax was involved, the mark scheme says ignore parallax lol Are there only certain conditions when you can use it bro?
Deadly_king:
--- Quote from: $!$RatJumper$!$ on October 30, 2010, 07:40:50 am ---I see.. ok so what types of experiments would you use parallax? I get confused because in experiments where its VERY evident parallax was involved, the mark scheme says ignore parallax lol Are there only certain conditions when you can use it bro?
--- End quote ---
I think for estimates, they don't accept parallax since there are pretty much more errors occuring.
So use parallax when you are accurately measuring something, like the length of a thread or something like that.
But like I mentioned earlier, avoid stating parallax as long as you can. Try to find new but sure sources of errors ;)
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