Which of the following observations about the friction force is (are) incorrect?
a) The magnitude of the kinetic friction force is always proportional to the normal force.
b) The magnitude of the static friction force is always proportional to the normal force.
c) The magnitude of the static friction force is always proportional to the external applied force.
d) The direction of the kinetic friction force is always opposite the direction of the relative motion of the object with respect to the surface the object moves on.
e) The direction of the static friction force is always opposite that of the impending motion of the object relative to the surface it rests on.
f) All of the above are correct.
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