In everyday praxis, we often need demonstration measuring devices (thermometers, pH meters, etc.), with large enough displays to be easily readable from every point in the classroom. Here, we present some of the capabilities of the Arduino platform for the school environment. This microprocessor board can be used for inexpensive construction of measuring devices for demonstrations and experiments performed by students in chemistry.

In everyday praxis we often need to demonstrate measuring devices-such as thermometers, manometers and voltmeters-with large enough displays that they can easily be read from anywhere in the classroom. In some cases, computers with a measurement interface can be used as a substitute, but often this is not possible (for example in the lab or in an outdoor environment). We present a low-cost basis for demonstration devices that can also be used in situ as data loggers or in the classroom as computer interfaces.

This paper describes theoretical calculation of the terminal velocity of falling cat, taking the air drag into account. The results show that a fall from the seventh floor is critical for the cat so we introduce a new quantity called the ‘coefficient of the cat’s fear’ during free fall. A subsequent experiment with a model of a cat carrying the accelerometer confirmed this conclusion. This calculation and experiment can act as a strong motivational factor during introductory physics courses.

No abstract

In this paper we present a critical analysis of some of the arguments of flat Earth theory, and we also try to show that this analysis and refutation of these false claims can be a useful exercise in critical thinking that is so much needed today. This article can also make it easier for teachers who are exposed to some of the arguments of flat Earth theory by their students. Some arguments of this theory are completely senseless, and some can simply be disproved by trigonometry or basic physical laws.