Penentuan Nilai Koefisien Restitusi Kelereng Kaca menggunakan Metode Pencitraan Jeda Waktu Sederhana
Abstrak
Time-lapse imaging has been performed to observe the physical phenomena of imperfect elastic
collisions between a glass marble and a tiled floor surface. The glass marble is dropped at a certain
height until it hits the floor and experiences repeated rebounds. The event was recorded using the
Infinix® Hot S3 smartphone device camera with a shutter speed of 30 frames per second. Analysis of
time lapse photography is then carried out using the frame splitting method which is then observed
visually to determine the height of each reflection that occurs. The results of the analysis and
measurement of the maximum height for the initial state, the first bounce state and the second bounce
state are respectively: 15.7 cm, 13.65 cm and 11.45 cm. The coefficient of restitution of glass
marbles—based on the data obtained—at the initial maximum height (𝐻0) towards the first reflection
(𝐻1) is ± 0.93242 and the first reflection (𝐻1) towards the second reflection (𝐻2) is equal to. ±0.91587.
These results prove that the interaction that occurs is an imperfect elastic collision interaction due to
𝑒 ≠ 1.
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