Required practicals
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Transcript of Required practicals
Required Practicals
Possible methods and skills gained
The new practical programme
• 10 required pracs not assessed but may be on the exam (paper 3) 10 hours
• Other pracs used to develop skills and help understanding of concepts 30/10 hours
• Investigation, assessed 10 hours• Gp4 project not assessed
Required
Suggested
2.1 Motion
Methods Skills
Ball drop Use of interface
Card drop linearizing
Picket fence Graph plotting
Video analysis Use of video
simulations
3.1 Thermal concepts
Methods Skills
Method of mixtures (no need for graph)
Use of thermometer/sensor
Electrical method (kettle) Data handling and uncertainties
Lat ht of steam apparatus
3.2 Modelling a Gas
Method Skills
Boyles law (with syringe and P sensor) Use of sensors
Charles law (with thin tube) Graphing
Pressure law (with P law apparatus) Uncertainties
Adiabatic gas law apparatus simulations
4.1 Travelling Waves
Method Skills
Pipe and audacity Use of audacity
Traditional pipes and tuning fork Careful adjustment
Pipes and oscilloscope Use of oscilloscope
Two microphone method Use of interface
4.4 Wave behaviour
Method Skills
Glass block and ray lamp Use of spectrometer
Minimum deviation Analysis of digital photographs
Algodoo Use of algodoo
5.2 Heating effect of electric current
Method Skills
Using resistance meters to measure resistance
Use of meters
Nichrome wire (many gauges) soldering
Resistivity paper (strips)
5.3 Electric Cells
Method Skills
Standard E and r method with ammeter voltmeter and variable R
Use of meters and variable resistor
Investigating cells? Linearization and graphing
Discharge of cell
7.1 Discrete energy & radioactivity
Method SkillsBeer foam decay Using log graphs
Simulation linearization
Flipping coins Video analysis
9.3 Interference (AHL)
Method Skills
Traditional set up Use of optical bench
Double slits and laser Use of laser
Hair and laser
11.2 Power generation and transmission
Method Skills
Measuring input and output with interface or oscilloscope
Soldering
Use of interface
Use of oscilloscope
11.3 Capacitance
Method Skills
Any ideas?
Sample question 1
• The speed of sound in air, v, was measured at temperatures near 0°C. The graph shows the data and the line of best-fit. The error bars for temperature are too small to be shown.
Sample question 2
• A student uses an electronic timer in an attempt to estimate the acceleration of free fall g. She measures the time t taken for a small metal ball to fall through a height h of 0.50 m. The percentage uncertainty in the measurement of time is 0.3 % and the percentage uncertainty height is 0.6 %.
• Using h=1/2gt2 calculate the expected percentage uncertainty in the value of g
• State and explain how the student could obtain a more reliable value for g
Sample question 3
• In an experiment to measure the specific heat capacity of a metal, a piece of metal is placed inside a container of boiling water at 100 C °. The metal is then transferred into a calorimeter containing water at a temperature of 10 C °. The final equilibrium temperature of the water was measured. One source of error in this experiment is that a small mass of boiling water will be transferred to the calorimeter along with the metal.
• Suggest the effect of the error on the measured value of the specific heat capacity of the metal
• State one other source of error for this experiment.