Posted by annie on Friday, October 28, 2011 at 12:31am.
a 160 g hockey puck slides horizontally along the ice, and the coefficient of kinetic friction between puck and ice is 0.15. if the puck a tarts sliding at 3 m/s, how far will it travel before it comes to a stop?
normal force = weight = .160*9.8
friction force = -.15*.160*9.8
a = F/m = -.15*.160*9.8/.160
=-.15*9.8 =-1.47
0 = vi + at = 3 - 1.47 t
so
t to stop = 3/1.47 = 2.04 seconds to stop
d = vi t - .5*1.47 t^2
=3*2.04 - .735*2.04^2
= 6.02-3.06
= 3 meters
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