Didactic experiments concerning the uniform motion usually require expensive apparatus and or equipment. The latter may be a restrictive factor for high school students and physics teachers. In this paper, we describe an alternative set of experiments concerning the motion of air bubbles in viscous media, which can be performed at home. The materials employed comprise a bottle of shampoo, a ruler and a digital clock. The experiment consists of the direct measurement of the velocity of the ascendant air bubble in a shampoo medium. We demonstrate that an exponential dependence of the force with the velocity agrees with the terminal velocities measured.
air bubble; viscous friction; uniform motion
