Question

A 17-kg sled is being pulled along the horizontal snow-covered ground by a horizontal force of 33 N. Starting from rest, the sled attains a speed of 1.6 m/s in 9.8 m. Find the coefficient of kinetic friction between the runners of the sled and the snow.

Answer 1

Answer:

$\mu=0.185$

Explanation:

From the question we are told that:

Mass $m=17kg$

Force $F=33N$

Velocity $v=1.6m/s$

Distance $d= 9.8m$

Generally the equation for Work done is mathematically given by

 $W=\triangle K.E+\triangle P.E$

Where

 $\triangle K.E=(F-F_f)*2$

 $F_f=F+\frac{\triangle K.E}{d}$

 $F_f=33+\frac{0.5*17*1.6^2}{9.8}$

 $F_f=30.8N$

Since

 $f = \mu*m*g$

 $\mu= 30.8/(m*g)$

 $\mu= 30.8/(17*9.81)$

 $\mu=0.185$