Public Release: 

Using cycling to explain why physics isn't a drag

IOP Publishing


IMAGE: This image shows a cyclist in motion. view more

Credit: Pixabay 2015 CC0

Scientists and teachers have combined to develop a simple spreadsheet-based method of teaching aerodynamic drag to 14 and 15 year olds. By measuring the speed of one of their classmates riding a bike and taking a photo in order to measure the frontal area of the cyclist, the students were able to calculate the drag co-efficient.

The results are published today, 11th December 2015, in the journal Physics Education.

"Usually, describing a realistic motion including aerodynamic drag would be beyond the scope of a secondary physics course. However, I realised that this could be done fairly easy for a bike slowing down by aerodynamic drag" explains Florian Theilmann, an author of the paper who is based at the Weingarten University of Education in Germany.

"In a common physics class, physics seems to be presented in a very simplified way." Theilmann continues. "Sure, that helps you to do easier calculations or some experiments but then it is less connected to real life."

The researchers and teachers setup an experiment where a student on a bike was asked to pedal up to a certain point and then call out their speed as they passed markers on the way. The students also measured the rolling friction of the bike on the surface by pulling the bike along using a dynamometer for 10 meters.

These data were then fed into an excel spreadsheet where the students could vary the aerodynamic drag to match an 'ideal' plot against the plot of their experimental data.

"It might be because it was near the end of the year, or because we were doing something quite different, but the students seemed very engaged with the project." Theilmann adds.

Theilmann is also confident that the computer will change how physics is taught.

"In the 19th century, it was necessary to understand how to do extremely sophisticated maths in order to do the more sophisticated physics" he explains. "But today, the computer has completely changed this - now problems are much simpler to calculate - so we're able to address much more complex problems and open up new frontiers in science."

Theilmann hopes to work on adapting more real-life physics problems to the classroom, including his current work on simple experiments with his own students such as the rate of flow of water out of a jug or the cooling down of a cup of tea.


IOP Publishing Press Release


For further information, a full draft of the journal paper, or to talk with one of the researchers, contact IOP Senior Press Officer, Steve Pritchard: Tel: 0117 930 1032 E-mail: For more information on how to use the embargoed material above, please refer to our embargo policy.

The paper can be found here:

IOP Publishing Journalist Area

The IOP Publishing Journalist Area gives journalists access to embargoed press releases, advanced copies of papers, supplementary images and videos

Login details also give free access to IOPscience, IOP Publishing's journal platform. To apply for a free subscription to this service, please email the IOP Publishing Press team at, with your name, organisation, address and a preferred username.

Exploring the aerodynamic drag of a moving cyclist

The published version of the paper "Exploring the aerodynamic drag of a moving cyclist" (Physics Education 51 015001) will be freely available online from Friday 11 December. It will be available at

DOI: 10.1088/0031-9120/51/1/015001

Physics Education

Physics Education is the international journal for everyone involved with the teaching of physics in schools and colleges.

IOP Publishing

IOP Publishing provides publications through which leading-edge scientific research is distributed worldwide.

IOP Publishing is central to the Institute of Physics, a not-for-profit society. Any financial surplus earned by IOP Publishing goes to support science through the activities of the Institute.

Go to or follow us @IOPPublishing.

The Institute of Physics

The Institute of Physics is a charitable organisation with a worldwide membership of more than 50,000, working together to advance physics education, research and application.

Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.