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As Physics Unit 3B 11th May 2012

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.. :frown:

I need an A for this exam badly.

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Reply 1

iBnavarro

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.

Reply 2

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

Reply 3

Babyblue

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. :/

Reply 4

quintillion

Original post by avipsita

Please can you list the 12 experiments. Help appreciated...

Reply 5

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

Reply 6

Grim Rinazyte

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

Reply 7

Grim Rinazyte

Great, thanks and good luck to all ! :smile:

Reply 8

demoin

Original post by avipsita

can you provide me with a link to those practicals because i cant find them??
thanks in advance :smile:

Reply 9

Grim Rinazyte

Actually i need that link as well, so if anyone has it please post it and thanks

Reply 10

avipsita

here you go .. and thank me later i am off to do physics myself
http://www.xtremepapers.com/papers/Edexcel/Advanced%20Level/Physics/Coursework%20and%20Practicals/

Reply 11

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 ??

Reply 12

avipsita

Maybe its not there but this is what i found doing a lot of research

Reply 13

Issa94

Original post by demoin

can you provide me with a link to those practicals because i cant find them??
thanks in advance :smile:

Look for those experiments in those papers, they are very helpful.
Mechanics: http://physics.slss.ie/resources/downloads/ph_pr_mechanics_experiments.pdf
Electricity: http://physics.slss.ie/resources/downloads/ph_pr_electricityexperiments.pdf
Light: http://physics.slss.ie/resources/downloads/ph_pr_lightexperiments.pdf

Good luck in ur 3B :smile:

Reply 14

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! :smile:

Reply 15

ShmangoBaby

Original post by lipton600

I have the same question :\ It's nowhere in the book...

Reply 16

The_New_Guy

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.

Reply 17

King_Arthur

Original post by lipton600

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

answers
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)