Question

Example showing friction depends on the force with which two surfaces are together

Answer 1

Example when you walk  the sole of your shoe and ground are in contact

Answer 2

Example.
When we gently push abook on a table,it stops after moving for some distance because friction opposes relative motion between the surfaces of the book and the table If we apply the force along the right direction,the friction acts along that direction in both cases,the force opposes the motion of the book.