We have found that a simple demonstration experiment using a match or a cotton swab and a drinking straw or an acrylic pipe serves as an effective introduction to dynamics. The most basic apparatus has a cotton swab serving as a dart and the straw as the blowgun. When blown from a starting point near the exit end of the straw, the cotton swab does not fly a significant distance. When the starting point is closer to the lips, the straw is projected 2–3 m. If two or three straws are connected to form a longer blowgun, the cotton swab flies even farther.

1.
Tsuguo Namba, “Mechanics with blowgun,” Easy and Basic Experiments for Science Education (Hyoronsya, Tokyo 1981) (in Japanese).
2.
Koji Shiono, “Short Blowgun and Long Blowgun,” Happy Class (Kasetsusya, Tokyo, 1986) (in Japanese).
3.
Kiyonobu Itakura and Koji Shiono, Mechanics with Blowgun (Kasetsusya, Tokyo, 2005) (in Japanese).
4.
Kiyonobu Itakura and Shigenori Sato, “Principle of Force and Motion,” 2002 (unpublished) (in Japanese).
5.
Koji Tsukamoto, Kiyonobu Itakura, and Makoto Kano, “Mechanics demonstrated with the use of darts,” International Newsletter on Physics Education44 (Oct. 2002) (International Commission on Physics Education).
6.
http://www.rika.com. This site is Japanese only. One of the vendor sites in English is http://www.sargentwelch.com/product.asp_Q_pn_E_WL2125-X_EA_A_BeeSpi+Velocimeter_E_.
7.
Unfortunately, we couldn't obtain permission to do this experiment inside.
8.
Inconsistent values were measured frequently.
9.
Lung capacity of the person (Kazuyuki) who executes this experiment is 3.0 × 10−3 m3.
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