Question

The strength of the force friction depends on which two factors?

Answer 1

1. Coefficient of friction(`mu`), between the surfaces of the two body.
2. The normal force(`f_N`).

Explanation:

Basically frictional force(`f`) depends :-

1. On the types of surfaces involved, for different surfaces, the
   Coefficient of friction is different.

2. How hard to surfaces push each other together, basically the
   Normal force.

Frictional force (`f`)= `mu`*`f_N`