(k) use of ICT such as computer modelling, or data logger with a variety…

The idea

This skill covers using information and communication technology in practical physics. You may use computer modelling to simulate a physical system, a data logger connected to sensors such as temperature, light, force or motion sensors to collect readings automatically, or software such as a spreadsheet to process and analyse data. For example, a data logger with a motion sensor can record displacement against time for a falling object, and spreadsheet software can then calculate velocity and acceleration by differentiation or graph plotting. You should understand the advantages: faster data collection, reduced human reaction-time error, and the ability to process large data sets. You should also recognise limitations, such as sensor calibration errors and sampling-rate constraints.

What earns the marks

• Describes how a data logger with a specified sensor, such as a light gate or motion sensor, is used to collect data automatically over time.
• Explains how computer modelling can simulate a physical system, for example projectile motion, to investigate how changing a variable affects the outcome.
• Describes how software such as a spreadsheet is used to process data, including calculating derived quantities, plotting graphs and identifying trends.
• States an advantage of ICT, such as reduced reaction-time error or rapid processing of large data sets.
• States a limitation of ICT, such as sensor calibration error, sampling rate limitations or reliance on correct model assumptions.

Common mistakes and how to put them right

• Assuming data loggers eliminate all error.

  Put it right: They reduce human reaction-time error but introduce sensor calibration and resolution uncertainties.

• Confusing computer modelling with real experimentation.

  Put it right: A model is only as valid as its underlying assumptions and cannot replace empirical measurement.

• Neglecting to specify the sensor type when describing data-logger use.

  Put it right: Name the sensor, such as a light gate or thermistor, and state what it measures.

Exam tips

• When asked about ICT in practical work, always name the specific sensor or software and state what it measures or processes.
• Give at least one advantage and one limitation to show balanced understanding.
• Link the ICT method to the physical quantity being investigated, rather than describing the technology in isolation.