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# Edexcel Physics Unit 3 9th May Watch

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1. Here are some helpful files

Experiments

http://www.thestudentroom.co.uk/show...8&postcount=68
(Thanks to muf_mur)

Uncertainty, Least Count and calculating uncertainty
http://www.thestudentroom.co.uk/show...0&postcount=27
2. Unit 1 practicals

1) Calculating speed and acceleration using a) Ticker tape
b) Light Gate

2) Calculating acceleration of free fall.

3) Comparing viscosity of liquids, calculating viscosity, terminal velocity and drag force using stokes' law.

4) Calculating young modulus using a copper wire.

These are the main unit 1 practicals, not too sure about unit 2.

Next time post in the sub forum "Physics Exams".
3. Thanks and I did post in the sub forum

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4. (Original post by NilFBosh)
Thanks and I did post in the sub forum

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What experiment u thnk will come? or atleast is it from u1 or u2 u thnk?
5. (Original post by Daniel Atieh)
What experiment u thnk will come? or atleast is it from u1 or u2 u thnk?
Most probably from Unit 2 electricity. ALthough most questions are repeated. like criticize the readings.
6. (Original post by NilFBosh)
Most probably from Unit 2 electricity. ALthough most questions are repeated. like criticize the readings.
aha cool...I've solved like 8 papers and almost everything went fine with me, some of them I got B and some A...so do u thnk this is enough to study for this paper?
7. does anyone here have any resources??
8. (Original post by Daniel Atieh)
aha cool...I've solved like 8 papers and almost everything went fine with me, some of them I got B and some A...so do u thnk this is enough to study for this paper?
Yeah it relatively easy compared to bio

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9. (Original post by NilFBosh)
Most probably from Unit 2 electricity. ALthough most questions are repeated. like criticize the readings.
I'm not too sure what "criticize the readings" tend to mean... help out?
10. (Original post by leafy9)
I'm not too sure what "criticize the readings" tend to mean... help out?
A list of tabulated readings will be given. If there are 5 or less readings u can write "not enough readings". If the experiment wasn't repeated u can write "readings not repeated". If in one column in the table, say potential difference and if some readings are given to 2 decimal places and some are given to one decimal place, u can say "inconsistent precision for potential difference readings" if the independent variable, say load, has irregular intervals, for eg 10N, 16N, 21N whereas its supposed to be like 10N, 15N , 20N u can write "inconsistent/irregular intervals for load"
Sometimes in a column for Force the unit will not be given, eg "Force" whereas it's supposed to be "Force/N" u can say "unit is not given for force"

These are all the criticizing u can do. Every table will not have all these defects. So read properly and criticize.

Hope this helps. And good luck.

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11. (Original post by NilFBosh)
A list of tabulated readings will be given. If there are 5 or less readings u can write "not enough readings". If the experiment wasn't repeated u can write "readings not repeated". If in one column in the table, say potential difference and if some readings are given to 2 decimal places and some are given to one decimal place, u can say "inconsistent precision for potential difference readings" if the independent variable, say load, has irregular intervals, for eg 10N, 16N, 21N whereas its supposed to be like 10N, 15N , 20N u can write "inconsistent/irregular intervals for load"
Sometimes in a column for Force the unit will not be given, eg "Force" whereas it's supposed to be "Force/N" u can say "unit is not given for force"

These are all the criticizing u can do. Every table will not have all these defects. So read properly and criticize.

Hope this helps. And good luck.

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Thanks loads! We sort of discussed this in class, but my teacher has this way of just talking through things... some specific things like this are sort of hard to catch up on.
12. (Original post by leafy9)
Thanks loads! We sort of discussed this in class, but my teacher has this way of just talking through things... some specific things like this are sort of hard to catch up on.
No thanks needed. Pls give me a rep

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13. (Original post by NilFBosh)
No thanks needed. Pls give me a rep

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Sure np!
14. (Original post by NilFBosh)
No thanks needed. Pls give me a rep

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Hey man..pleaseee check for me this image, am really confused in this experiment, i thnk it depends on what the question says or what...thanks
15. (Original post by Daniel Atieh)
Hey man..pleaseee check for me this image, am really confused in this experiment, i thnk it depends on what the question says or what...thanks
What you did is correct ( the first 4 steps). You might want to add that the average diameter is measured at different places using a micrometer screwgauge. Also it is better to use a potentiometer than a rheostat.

Using different lengths of the wire would mean that you have to keep the diameter constant which is very difficult. Its always better to test on the same material rather than using different ones.

If the question specifically asks us to measure resistivity using different lengths of wires (unlikely) then we should do as they ask, else those 4 steps are perfectly fine

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16. (Original post by Relaxedexams)
What you did is correct ( the first 4 steps). You might want to add that the average diameter is measured at different places using a micrometer screwgauge. Also it is better to use a potentiometer than a rheostat.

Using different lengths of the wire would mean that you have to keep the diameter constant which is very difficult. Its always better to test on the same material rather than using different ones.

If the question specifically asks us to measure resistivity using different lengths of wires (unlikely) then we should do as they ask, else those 4 steps are perfectly fine

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thanks a lot really! and which experiment u guess will come?
17. (Original post by Daniel Atieh)
thanks a lot really! and which experiment u guess will come?
Viscosity/ thermistor/ stationary waves seem most likely.

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18. (Original post by Daniel Atieh)
Hey man..pleaseee check for me this image, am really confused in this experiment, i thnk it depends on what the question says or what...thanks
All 4 points correct but it depends on the question too. Don't worry abt it

When using a potentiometer, move the tapping key of the potentiometer at different points of the wire and measure the length and record the corresponding voltmeter and ammeter readings. The measure the resistance at each length of the wire and plot a graph

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19. So these are the practicals you have to study.

Unit 1 practicals

1) Calculating speed and acceleration using a) Ticker tape
b) Light Gate

2) Calculating acceleration of free fall.

3) Comparing viscosity of liquids, calculating viscosity, terminal velocity and drag force using stokes' law.

4) Calculating young modulus using a copper wire.

Unit 2

1) Measuring the resistivity of a wire

2) Measuring the internal resistance of a cell

3) Finding the condition to obtain optimum power output in the load (Not sure if this experiment is in the syllabus)

4)Verifying the change in resistance of thermistor with temperature

5) Measuring Plancks constant

6) Standing/Stationary waves experiment (Not sure abt this but better to be sure)

If there's something missing pls let me know
20. Can anyone give me an idea about uncertainty like how do we calculate it and why sometimes we use the least count as the uncertainty , this is so confusing

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