Question

A 0.1 kg hockey puck, initially moved at 5 m/s, slides a distance of 50 meters across a horizontal ice surface and comes to a stop due to some friction

Answer 1

Find the coefficient of friction.

$F_f=ma\to\mu N=ma\to \mu mg=ma\to \mu=\frac{a}{g}$

$s=\frac{v^2-v_0^2}{2a}\to a=\frac{v^2-v_0^2}{2s}=\frac{5^2-0^2}{2\cdot 50}=0.25(m/s^2)$

$\mu=\frac{0.25}{9.8}=0.026$ . Answer