## anonymous 5 years ago This is what might be a simple physics question. but i've been sick and am so lost. a 15.0 kg box is released on a 32 degree incline and acclerates down the incline at .30 m/s^2. find the friction force impeding its motion. what is the coefficient of kinetic friction? how do i start this?

1. anonymous

Do the free body diagram and calculate the y component of acceleration

2. anonymous

with why being perpendicular to the surface?

3. anonymous

sorry Y****

4. anonymous

YEs

5. anonymous

hm ok thanks

$g\sin{32}-f_rg\cos{32}=0.3$ $g=9.8$ By solving, we get $f_r=0.9639$

7. anonymous

ah thank you