Oblicz współczynnik tarcia łyżew o lód, jezeli szybkość łyźwiaża v1=10m/s na drodze 25 m została zedukowana do v2=5m/s.
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v² = v₀² + 2as
a = (v² - v₀²)/2s = (100-25)/50 m/s² = 1,5m/s²
Z 2 zasady dynamiki Newtona:
a = F/m
F = fN = fmg
a = fmg/m = fg
f = a/g = (1,5m/s²)/(10m/s²) = 0,15