Mphamvu ya kukangana kwa kinetic

Kukangana kwa kinetic ndi mphamvu yokangana yomwe imagwira ntchito pamwamba pa zinthu zomwe zikukhudzana wina ndi mnzake pamene zinthuzo zikuyenda.
Ngati mukufuna kudziwa mphamvu ya static friction, gwiritsani ntchito equation 1.5 a. Ngati mukufuna kudziwa kinetic friction coefficient, gwiritsani ntchito equation 1.5 b.
Chithunzi 2 chikuwonetsa chinthu chomwe chikukokedwa nthawi zonse kuti chinthucho chiziyenda pa liwiro losasintha. Mukasuntha pa liwiro losasintha, kukula kwa f_k wofanana ndi kukula kwa mphamvu yokoka (F).

Lamulo Loyamba la Newton limati chinthu chimayenda pa liwiro losasintha ngati mphamvu yonse (mphamvu yotuluka) ndi yofanana ndi zero.
Chitsanzo cha mavuto.
1. Chipika cha 1 kg choyikidwa pamalo athyathyathya chimakokedwa pogwiritsa ntchito dynamometer mpaka chipipikacho chikuyenda pa liwiro losasintha. Ngati kukula kwa mphamvu yokoka yomwe ikuwonetsedwa ndi dynamometer ndi 1 Newton ndipo kuthamanga chifukwa cha mphamvu yokoka ndi 10 m/s², dziwani: (a) kukula kwa mphamvu ya kukangana kwa kinetic (b) coefficient ya kukangana kwa kinetic
Zokambirana
Ndizodziwika kuti :
Kulemera kwa chipika (m) = 1 kg
Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s²
Kulemera kwa chipika (w) = mg = (1 kg)(10 m/s²) = 10 kg m/s² = 10 Newton
Kukula kwa mphamvu yokoka (F) = 1 Newton
Yankhani :
(a) F yayikulu_k
Pamene chipikacho chikuyenda nthawi zonse kapena chikuyenda pa liwiro losasintha, kukula kwa f ndi_k = kukula kwa mphamvu yokoka (yerekezerani equation 1.6)
Kotero kukula kwa mphamvu ya kinetic friction (f_k) = kukula kwa mphamvu yokoka (F) = 1 Newton
(b) Kuchuluka kwa kupsinjika kwa kinetic

Referensi