im trying to find the answer to this question.. "in addition to reducing friction, what other advantage does a roller-type cam follower have in an engine?" i cant decide if this response is correct. "lower reciprocating weight." i know it reduces friction, but does the friction of materials in an engine get calculated into reciprocating weight? i can see how friction is resistance, and if its resistance to the engine reciprocating, than it might as well be like weight. but just because it slows the movement doesnt really mean that makes its calculated reciprocating weight any less right? Unless being a roller-type cam follower is actually lighter than a non-roller type. But I don’t know the specs of the two, and its not given in the question. really need some help here. thank you.