An object with a mass of $9 k g$ $9 kg$ is on a plane with an incline of $- \frac{π}{4}$ $- pi/4$ . If it takes $24 N$ $24 N$ to start pushing the object down the plane and $5 N$ $5 N$ to keep pushing it, what are the coefficients of static and kinetic friction?

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Answer 1 · 2017-11-11T12:02:02

$μ_{s}$ $mu_s$ = 0.4

$μ_{k}$ $mu_k$ = 0.1

24N to (START PUSHING ) = $F_{smax}$ $F_"smax"$

5N to ( KEEP PUSHING IT ) = $F_{K}$ $F_K$

$μ_{smax}$ $mu_"smax"$ = $\frac{F_{smax}}{N}$ $F_"smax"/N$

N = mgcos( $θ$ $theta$ )

$θ$ $theta$ = - $\frac{π}{4}$ $pi/4$

m = 9kg ---- Plug in the numbers to get $μ_{smax}$ $mu_"smax"$

$μ_{k}$ $mu_k$ = $\frac{F_{k}}{N}$ $F_k/N$ Do the same thing to get $μ_{k}$ $mu_k$

An object with a mass of 9kg9 kg is on a plane with an incline of −π4 - pi/4 . If it takes 24N24 N to start pushing the object down the plane and 5N5 N to keep pushing it, what are the coefficients of static and kinetic friction?