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# Edexcel IAL Physics Unit 03 WPH03 - 10th of May, 2017 watch

1. Hi guys!
I'm a bit nervous about physics unit 03 exams. Could anyone say me what experiments I should focus on. Any predictions?
And guys, we can share resources and questions.
Spoiler:
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Tag any members who are taking the same exam.
2. (Original post by Reshyna)
Hi guys!
I'm a bit nervous about physics unit 03 exams. Could anyone say me what experiments I should focus on. Any predictions?
And guys, we can share resources and questions.
Spoiler:
Show

Tag any members who are taking the same exam.

I am so sorry, but I don't do physics.
I'll try to help where possible, but I'm a bit of a no-go at the moment.
Soz.
3. (Original post by Nunchuck-master-2334)
I am so sorry, but I don't do physics.
I'll try to help where possible, but I'm a bit of a no-go at the moment.
Soz.
ok.
4. Hi guys.
I found this on the 2015 thread. Maybe you all find this useful.

Here are the practicals which u need to have a knowledge of in order to solve the paper:

Practical 1: determination of speed and acceleration
Practical 2: water path in gravity
Practical 3: Centre of gravity
Practical 4: the effect of force on the acceleration of an object
Practical 5: Acceleration and force using a linear air track
Practical 6: Measurement of the acceleration due to gravity
Practical 7: Estimates of the weight of objects
Practical 8: Potential and kinetic energy
Practical 9: Power of an electric motor
Practical 10: force-extension experiment
Practical 11: measurement of the young modulus
practical 12: Measurement of the young modulus (accurate method)
Practical 13: Melde's experiment (vibration generator)
Practical 14: The sonometer
Practical 15: Refractive index measurement
Practical 16: Stress concentrations investigations - polarized lights
Practical 17: Current and voltage in series and parallel circuits
Practical 18: Ohmmeter and the total resistance of circuits
Practical 19: Efficiency of an electric motor
Practical 20: The variation of current with applied voltage
Practical 21: Resistivity of metal wires and polythene
Practical 22: potential along a wire
Practical 23: Internal resistance of cells - potentiometer method
Practical 24: Emf and internal resistance of a cell - voltmeter and ammeter
Practical 25: Temperature coefficient of resistance
Practical 26: The resistance of a thermistor
Practical 27: Flow of electric charge

According to what my teacher told me that in order to solve unit 3, u need to build a strong concept base of unit 1 and 2. And for each of the practical mention above u need to know the "safety" for each practical and practice questions from sample assessment and all the questions papers of June and Jan papers.

Here are some notes to be noted and can be used while answering questions:

during an experiment there can be three kind of errors:
1. personal ----> may be due to carelessness
2. Systematic ----> may be due to fault in apparatus
3. Random ---> maybe due to invisible unseen causes

to minimize error ----> 1. repeat it again 2. take average

what is uncertainty?
fault in the apparatus due to limitation of apparatus

limitation of apparatus = least count/ precision

reliable ---> less error
Precise ---> small value

less reliable ---> more precise >>> reason: because its difficult to take small measurement!

absolute uncertainty = least count = maximum value of uncertainty

greater than least count ---> personal error

percentage uncertainty = least count/measurement*100
5. This is great.
Thanks.

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How can I work this out?

Attachment 628024
7. this is great!! thank you!
8. Recorrect the title someone please. The date is 10th of may !
9. (Original post by Reshyna)
How can I work this out?

Attachment 628024
Theres an attachement error
Re-post it !
10. (Original post by Ahmed3651998)
Recorrect the title someone please. The date is 10th of may !
I created this thread in january, and during that time the date was 11th but afterwards they changed the timetable
Paracosm
11. (Original post by Ahmed3651998)
Theres an attachement error
Re-post it !
The attachment was good, the time i posted it
but now i will re-post it
12. (Original post by Reshyna)
I created this thread in january, and during that time the date was 11th but afterwards they changed the timetable
Paracosm
Yo! Most of the people loke to search their desired threads by typing in the exam dates.
I wasnt angry but instead i made a request to change the date only. Thats for other students' sake.
13. (Original post by Reshyna)
The attachment was good, the time i posted it
but now i will re-post it
Its easy actually....
First find the value before the ZERO line, of the small (vernier) scale, on the main scale.
Second find the value where the small (vernier ) scale just exactly matches the main scale.
Third the value in second step divide it by ten and multiply it by the accuracy of the main scale.
14. (Original post by Ahmed3651998)
Its easy actually....
First find the value before the ZERO line, of the small (vernier) scale, on the main scale.
Second find the value where the small (vernier ) scale just exactly matches the main scale.
Third, the value in second step divide it by ten and multiply it by the accuracy of the main scale.
Finally, add up the values of step 1 and step 3 you'll get 11.27
If you need more help
Search in youtube theres a good video on it.
15. Currently doing past papers
I could not understand this question, which planet these numbers are from?
I could not get them correctly
Attached Images

16. I hope this helps

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17. (Original post by bazlawth)
Currently doing past papers
I could not understand this question, which planet these numbers are from?
I could not get them correctly
I posted the picture to its solution check it out.
Yo! Its nothin' to worry yeah ? Its actually everyones wish to find the mean whatever the way it suits them. So in the mark scheme they took the difference without multiplying by two. Then the find the mean and at the end they multiply it by 2 therefore youll get the same answer !

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18. To find the uncertainty use the max and min values of the range. Subtract the min from max then divide by 2 to get the uncertainty.
For eg we have 3 values 312 328 320
Then range is 328-312 divide it by 2 youll get 8mm as uncertainty.

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19. This is vvvv helpful !

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20. Thank you, that does seem helpful. But the experiments are very few...

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