Saturday, January 12, 2013

Koefisien Gesekan – Rumus, Penjelasan

Dari hasil percobaan di atas ternyata pada saat balok kayu yang terletak pada papan tripleks atau papan tripleks yang dilapisi plastik ditarik balok  kayu tidak langsung bergerak. Hal tersebut berarti selama balok kayu ditarik dengan suatu gaya pada bidang singgung balok kayu timbul gaya gesekan yang disebut gaya gesekan statis yang diberi lambang “ƒs” seperti tampak pada gambar 2.1.

gaya gerak

Besar gaya gesekan sebanding dengan besar tekanan di antara kedua permukaan benda. Gaya gesekan statis dapat dinyatakan dengan persamaan:

rumus persamaan gaya gesekan statis

Selama benda belum bergerak pada saat benda ditarik oleh gaya F tersebut di atas maka besar gaya gesekan terus bertambah dan gaya gesekan statis mencapai nilai maksimum pada saat benda tepat akan bergerak. Gaya gesekan pada saat benda tepat akan bergerak disebut gaya gesekan statis maksimum yang diberi lambang image yang besarnya dapat dinyatakan dengan persamaan:

rumus gaya gesekan statis maksimum

Bagaimanakah jika benda dalam keadaan bergerak apakah juga terdapat gaya gesekan?
Contoh benda yang dilempar pada suatu bidang ternyata benda yang semula bergerak akhirnya berhenti. Hal tersebut berarti selama benda bergerak juga timbul gaya gesekan dan gaya gesekan yang timbul dinamakan gaya gesekan kinetis yang diberi lambang “fk” dan dapat dinyatakan dengan persamaan:

rumus gaya gesekan yang timbul

Uraian di atas diperoleh pengertian bahwa koefisien gesekan kinetis adalah koefisien gesekan yang timbul selama benda bergerak. Nilai μs > μk


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