What is meant by limiting friction?

What is meant by rolling friction ?

What is meant by 'rolling friction' ?

What is meant by limiting molar conductivity?

i) State Kohlrausch law. ii) What is meant by limiting molar conductance.

The limiting molar conductivity of an electrolyte is obtained by adding the limiting molar conductivities of cation and anion of the electrolyte. What is meant by limiting molar conductivity ?