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# As Physics Unit 3B 11th May 2012 Watch

1. Is anyone doing this exam?
Please, can anyone predict which experiments will come?
And also, please can we discuss about all the experiments in the As level specification of physics.
I am really worried.. I need an A for this exam badly.
2. I am doing the same exam the same day, and i am really worried about the electricity experiments. Anyways i think it is easier than Unit 1 and 2.
3. Hey guys I am going the paper as well ... However with the knowlege I hav ev there can beany experiment .. There are about 12 ones that you should now .. Like in jan 2012 planks contant came up you need to know thw theory vehind it to prove it .. I think this year the mothion experiment might come up or something to do with energy transfer .. Or an expeeiment to do with waves might come up
4. can some one please please teach me how to solve those euqations?
i do not study math and i really really suck and fractions and algebra.

for example, prove the given equation obeys y=mx+c.
questions like that. :/
5. (Original post by avipsita)
Hey guys I am going the paper as well ... However with the knowlege I hav ev there can beany experiment .. There are about 12 ones that you should now .. Like in jan 2012 planks contant came up you need to know thw theory vehind it to prove it .. I think this year the mothion experiment might come up or something to do with energy transfer .. Or an expeeiment to do with waves might come up
Please can you list the 12 experiments. Help appreciated...
6. here you go ..
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
you can get the experiments of the xtreme papers
7. Hi all, i'm doing this exam as well and i also need to know the 12 experiments. i think i know a few, please help me to list all of them, here's a few :

1- Measuring the young modulus for a material.
2- Investigating Stokes' law and calculating the coefficient of viscosity.
3- Investigating force-extension characteristics of a material.
4- Finding Plank's constant
8. Great, thanks and good luck to all !
9. (Original post by avipsita)
here you go ..
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
you can get the experiments of the xtreme papers
can you provide me with a link to those practicals because i cant find them??
10. Actually i need that link as well, so if anyone has it please post it and thanks
11. here you go .. and thank me later i am off to do physics myself
http://www.xtremepapers.com/papers/E...%20Practicals/
12. I don't actually think Melde's experiment and the sonometer are included, cuz iv'e never heard of it before, can you please re-check ??
13. Maybe its not there but this is what i found doing a lot of research
14. (Original post by demoin)
can you provide me with a link to those practicals because i cant find them??
Look for those experiments in those papers, they are very helpful.
Mechanics: http://physics.slss.ie/resources/dow...xperiments.pdf
Electricity: http://physics.slss.ie/resources/dow...xperiments.pdf
Light: http://physics.slss.ie/resources/dow...xperiments.pdf

Good luck in ur 3B
15. Hey, i've got a question even if its a little silly.. How do you know for the best settings to use in a multimeter instrument, eg question 1 in May 2010 paper. If anyones kind enough to explain? Thanks!
16. (Original post by lipton600)
Hey, i've got a question even if its a little silly.. How do you know for the best settings to use in a multimeter instrument, eg question 1 in May 2010 paper. If anyones kind enough to explain? Thanks!
I have the same question :\ It's nowhere in the book...
17. (Original post by Grim Rinazyte)
I don't actually think Melde's experiment and the sonometer are included, cuz iv'e never heard of it before, can you please re-check ??
I dont think Melde's experiment and the sonometer are so important but they are mentioned as suggested experiments in the specification.
18. (Original post by lipton600)
Hey, i've got a question even if its a little silly.. How do you know for the best settings to use in a multimeter instrument, eg question 1 in May 2010 paper. If anyones kind enough to explain? Thanks!
you first calculate the current using V=IR
then select the scale which will seem not too big or too small

Eg. MAy 2010

V=IR
I=V/R
=3/110
=.027A
= 27mA

1. 2000microAmp = 2mA too small as reading is larger
2. 20mA - too small as reading is larger
3.200mA - reading within the range most suitable
4.10A = 10000mA - reading within the range - but scale to large(not accurate)
19. thank you guys for the links

good luck to you also
20. (Original post by anjelofernando)
you first calculate the current using V=IR
then select the scale which will seem not too big or too small

Eg. MAy 2010

V=IR
I=V/R
=3/110
=.027A
= 27mA

1. 2000microAmp = 2mA too small as reading is larger
2. 20mA - too small as reading is larger
3.200mA - reading within the range most suitable
4.10A = 10000mA - reading within the range - but scale to large(not accurate)
Thanks anjelofernando, i think i quite get how the settings work.. its like a range whereby ur value should lie between? correct me if i'm wrong

Updated: May 16, 2012
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