Stopwatch
editHuman error on using stopwatch
edit- Even though stopwatch is created to be more accurate, human still make an error in every time they use stopwatch. Normally, human will take about 180 - 200 ms or about 1.8 - 2.0 second to detect and response the visual stimulus[1]. Therefore, most of the calculation error are happened because of this reason. To get more accurate result, most of the researchers use error propagation equation in order to reduce error on every experiment[2]
Unit
edit- In most of the science experiment, researchers will normally use SI or International System of Unit on any of their experiment. For unit of time that we observe on the stopwatch, generally we will use minute and second[3].
Photos
- Digital stopwatch (1)
- Propagation error formula (2)
References
edit- ^ Jain, Aditya; Bansal, Ramta; Kumar, Avnish; Singh, KD (2015). "A comparative study of visual and auditory reaction times on the basis of gender and physical activity levels of medical first year students". International Journal of Applied and Basic Medical Research. 5 (2): 124. doi:10.4103/2229-516X.157168.
{{cite journal}}:|access-date=requires|url=(help)CS1 maint: unflagged free DOI (link) - ^ "A Summary of Error Propagation" (PDF). http://ipl.physics.harvard.edu. Harvard University. Retrieved 10 October 2017.
{{cite web}}: External link in|website= - ^ Gust, Jeff C.; Graham, Robert M.; Lombardi, Michael A. (January 2009). "Stopwatch and Timer Calibrations (2009 edition)" (PDF). Retrieved 10 October 2017.
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