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Predictions for physics practical tom!!

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62Peace:
how do you know how many significant figures to quote?

Twinkle Charms:

--- Quote from: 62Peace on May 24, 2010, 07:50:43 pm ---how do you know how many significant figures to quote?

--- End quote ---
whatevr s.f you are usuing intially be consistent with it till the last of that question for all the values, for example if you took 3 s.f for your first reading, then for all the other values write them correct to 3 s.f.   

62Peace:
So basically the initial number of significant figures that I should use is my own choice but what matters is that i should keep them the same for the values calculated from the raw values?
For example I am recording the diameter of a ball using a micrometer or a v.calliper, then using 3 significant figures in both cases would be right?
What about thermometric readings? Will, say, 31.2 degree C be okay?

Diablo:
Paper 31 is most likely to have 1 circuit related question and another mechanical question (oscillations, pendulum, etc).

I heard that there's going to be an oscillation question(mechanical question) and something regarding a magnet and thread in paper 34.

This information is merely based on what the vast majority are saying.

Good luck everyone....

Twinkle Charms:
okay for the second question, errors and improvements :

Errors
1. small air bubbles are formed on the marble/spheres/(any balls being used) which hindered the motion of the ball
2. two sets of reading not enough to draw a valid conclusion
3. human error in timing
4. marble may have not reached terminal velocity


Improvements
1. release the ball/marble just a few mm above the oil surface
2. take more readings and plot a graph
3. use light gate to trigger stopwatch/high speed camera with known time intervals/use video camera with slow motion replay
4. ensure the terminal velocity by increasing the release height/using long tube/measure velocity at two intervals to check terminal velocity reached.



ALL THANKS TO XTREMEPAPERS.NET.

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