Question

which is the type of kinetic friction that is difficult to overcome?
○ sliding
○ static
○ rolling
○ fluid

Explanation:

First, eliminate static friction as it acts on stationary objects, not moving (kinetic) ones. Among kinetic friction types: sliding friction occurs when two surfaces slide against each other, rolling friction is between a rolling object and a surface, and fluid friction is between an object and a fluid. Sliding friction has the highest coefficient of friction among these kinetic types, making it the most difficult to overcome.

Answer:

A. Sliding