- #1
addy899
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Homework Statement
A child's slide is flat, 5 meters long, and sloped down so that the top is 3 meters higher than the bottom. A child slides down, starting from rest, and has v = 6 m/s at the bottom. Find the coefficient of kinetic friction, μk is:
Homework Equations
F=ma
f=μkFN
v2=v02+2aΔx
The Attempt at a Solution
use above equation to find constant a=3.6m/s2
3-4-5 triangle, so θ= 30°
free body diagram gives:
FN=mgcos30
and using f=ma,
Fnet=3.6m = mgsin30-μkFN
the masses cancel out to give 3.6 = gsin30-μkgsin30
solving for μk gives 0.153
my key says the answer is 0.3