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I am giving edexcel physics unit 3 on 8 as well.....How r u all preparing?!?!
Original post by Ashley_01
I am giving edexcel physics unit 3 on 8 as well.....How r u all preparing?!?!


Hey! I'm really scared about phy tbh... Could you abswer the questio I asked in the OP? Thanks <3
I am actually very bad at all this, I have like memorized precision for the most common instruments, like screw gauge, metre rule etc....But for these, diff ans are given in diff pprs and examiner reports..I too am confused...:s-smilie:

Anyone else who could help us?!?!?!
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
Reply 6
Original post by mohamedalhendi
Here are the practicals which u need to have a knowledge of in order to solve the paper:

That was literally copy-pasted from a 2010 tsr thread but I have to say thanks because I didnt know it existed until this post :P
*reps*
is everyones studying going well?
i really have no idea how to study for u3 its a headache
Its pretty good. :biggrin:
And about precision of volt/ammeter I write instrument name for specific measurement then division. I usually guess sensible precision tho :P
And if some values are given you can calculate the current and voltage flowing through the circuit and then write. There is nothing to get scared of chill.
(edited 8 years ago)
Original post by usmanzubair
Its pretty good. :biggrin:
And about precision of volt/ammeter I write instrument name for specific measurement then division. I usually guess sensible precision tho :P
And if some values are given you can calculate the current and voltage flowing through the circuit and then write. There is nothing to get scared of chill.

Hey Usman, good to see you again....as for the question, So eg, a current of 100 mA and voltage of 10V...What would be the precison for both of them?
Original post by mymomsaidstudy
is everyones studying going well?
i really have no idea how to study for u3 its a headache


Yeah me too! I'm not sure what to revise so I just did all the past papers...
But my friends are trying to remember all the practicals we've done, do you think it's a good idea?
Reply 11
Original post by mohamedalhendi
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


Most of these are not in our syllabus anymore..... Does anyone have a more updated list?
does anyone has notes for possible experiments?
Reply 13
any predictions on what the main experiment question would be??
Reply 14
I hope its young modulus... I have a feeling about it
and um so how should I study? just past papers, basic notes enough??
Reply 15
last year of syllabus? I don't know bout that
didn't IAL just start likein 2014?

and yes, basically the pattern and contents of the paper the basis of all of em is repeated
so , which one do you expect to appear?
Are there any exp related to waves, tht could be asked in the long explaination ques(the one for 9-11 marks)???
Reply 18
you guys thats practical we basically dont have to memorize anything i have notes if u guys want to take a look at them and they will be really helpful
UNIT 3, doubt, anyone please help me on this question number 1. How is it 20v??