WPH16Topic 6.32 questions
Planning, carrying out and evaluating the A2 core practicals from Units 4 and 5.
Plan an experiment: identify the most appropriate apparatus, giving details such as range and resolution of instruments and relevant dimensions of apparatus
Describe how to measure relevant variables using the most appropriate instrument(s) and techniques, and how to control all other relevant variables
Identify health and safety issues and discuss how these may be dealt with
CORE PRACTICAL 9: Investigate the relationship between the force exerted on an object and its change of momentum
CORE PRACTICAL 10: Use ICT to analyse collisions between small spheres, e.g. ball bearings on a table top
CORE PRACTICAL 11: Use an oscilloscope or data logger to display and analyse the potential difference across a capacitor as it charges and discharges through a resistor
CORE PRACTICAL 12: Calibrate a thermistor in a potential divider circuit as a thermostat
CORE PRACTICAL 13: Determine the specific latent heat of a phase change
CORE PRACTICAL 14: Investigate the relationship between pressure and volume of a gas at fixed temperature
CORE PRACTICAL 15: Investigate the absorption of gamma radiation by lead
CORE PRACTICAL 16: Determine the value of an unknown mass using the resonant frequencies of the oscillation of known masses
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Original practice questions written in the style of the exam.
In the core practical to determine the viscosity of a liquid, small ball bearings are dropped into a tall tube of the liquid and timed between two marks.
(a) Explain why the upper mark is placed well below the surface of the liquid.
(b) Describe how the student could check that the ball has reached terminal velocity before the timed section.
In the core practical to determine the Young modulus of a metal, a long thin wire is loaded with masses and its extension is measured.
(a) Explain why a long, thin wire is used.
(b) Explain why the diameter of the wire is measured at several points along its length and in different orientations.