According to my teacher, neglect friction means to neglect the work of friction. I believe that it means that the system is frictionless. Am I wrong?
The problem is specifically, "A 5 kg cylinder 0.5 m in diameter rolls down a plane 5 m long inclined 30° with the horizontal at the bottom of the incline. What is its (a) total kinetic energy, (b) linear speed, (c) angular speed, (d) rotational kinetic energy, and (e) translational kinetic energy? Neglect friction."