Abstract
Friction occurs early in our lives. We rub our hands and stamp our feet to get them warm. Another effect of friction is the use of winter tires at cars, new bicycle tires, or special shoes for icy surface. This article discusses how to present the way from friction to air resistance through GeoGebra applets. The approach has been analyzed using the theory of technology as amplifier and reorganizer, theory of variation, and the notion of internal and external representations. The dragging feature of GeoGebra enables students to experience variation and make conjectures. Furthermore, students’ static internal representations will be enhanced to dynamic external representations, which can play an important role in students’ learning. Three aspects of fidelity have been discussed with regard to the use of GeoGebra based applets and how such applets need to be critically designed and assessed in order to support students’ learning.
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