Finger swipe speed. Your smartphone square touch screen measures 10 cm x 10 cm and implements a 100 x 100 switch array. A horizontal finger swipe must activate at least 25 columns in any particular row within 0.5 seconds. What is the minimum speed (m/s) that your finger must travel to form a valid finger swipe?
What will be an ideal response?
The finger must travel distance d > a quarter of the horizontal distance in 0.5 seconds.
The speed is then s > d/0.5s = (2.5 x 10-2 m)/(0.5 s) = 5 x 10-2 m/s.
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