Question

what the gradient of kinetic fricton vs normal force represent​

Answer 1

$\huge{\bf{\red{\mathfrak{answer}}}}$

If we graph kinetic friction force vs. weight, we would find a straight line with a slope of 0.5. The slope of this graph represents the coefficient of friction, \begin{align*}\mu_k\end{align*}. Notice that friction is measured in Newtons since it is a force.