[color=#0000ff][i][color=#999999][color=#0000ff][i][color=#0000ff][i][color=#999999][color=#0000ff][i][color=#0000ff][i][color=#999999]This activity belongs to the GeoGebra book [url=https://www.geogebra.org/m/mes4bgft]The Domain of the Time[/url].[/color][/i][/color][/i][/color][/color][/i][/color][/i][/color][/color][br][/i][/color][right][color=#0000ff][i][i]Time does not exist. [br]I have 15 minutes to convince you of that.[br][/i][br][/i]Carlo Rovelli, Italian physicist, at the beginning of a TEDx talk[br][/color][/right]Despite the inaccuracy, we can explore the idea of using travel time proportional to its length. To do this, we can create a "virtual clock" based on the systematic repetition of a slider. Each back-and-forth movement of the slider will serve as a unit of measure for "virtual time". This virtual time will not coincide with real time but can be used to establish relative timings between moving objects.[br][br]We can create our own "relative" clock. For example, by associating a counter with a slider. Each time the slider changes value, the counter will increase by one unit. In this way, the counter acts as a temporal reference, like a metronome, with which we can compare the durations of the movements.

[color=#999999][color=#999999][color=#0000ff][color=#0000ff][color=#999999][color=#999999]Author of the activity and GeoGebra construction: [/color][/color][/color][color=#0000ff][color=#999999][color=#999999][url=https://www.geogebra.org/u/rafael]Rafael Losada[/url].[/color][/color][/color][/color][/color][/color]