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