After your experiments, determine an equation that determines the maximum force exerted by friction when the box is at rest. We call this type of friction static friction.

a) Fₛₜₐₜᵢ = μₖ N
b) Fₛₜₐₜᵢ = μₛ N
c) Fₛₜₐₜᵢ = μₛ
d) Fₛₜₐₜᵢ = μₖ