(a) When rebuilding her car's engine, a physics major must exert 250 N of force to insert a dry steel piston into a steel cylinder at a constant velocity. (Assume the coefficient of kinetic friction is 0.3.) What is the normal force between the piston and cylinder?
N
(b) What force would she have to exert if the steel parts are oiled, so that the coefficient of friction is 0.03?
N