# Physics Edexcel International A-Level Unit 3b

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#1
Hey guys.
So physics Unit 3b tomorrow! Kind of stressed and kind of not.
What are the key experiments that normally crop up for the 9 mark question???
Also, what are the most common sources of uncertainty in an experiment (eg. Parallax, Zero error etc.)

Thanks!
0
6 years ago
#2
OMG It is so hard, most people will fail. It's the hardest thing in the history of A-levels.
You definitely should be stressed. :O
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#3
lol nah it will be ok. Just remember like general electricity experiments/solids experiments and uncertainty and safety and it will be ok.
You'll probs do better than u think.
I just don't know which are the main experiments?
0
6 years ago
#4
(Original post by bobbydylan)
lol nah it will be ok. Just remember like general electricity experiments/solids experiments and uncertainty and safety and it will be ok.
You'll probs do better than u think.
I just don't know which are the main experiments?
This should cover it:

Practical 1: determination of speed and accelerationPractical 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
0
6 years ago
#5
Im a bit stressed actually!
0
6 years ago
#6
ive got a doubt, can anyone help me out.

a engineer obtained three sets of data. The values for the yound modulus were 14.2, 14.7 and 15.1 GPa.

Determinne the average value and state its uncertainty?

i have got the average value of 14.7 GPa how to callculate the uncertainty?
0
6 years ago
#7
young*
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