ABSTRACT
Because.of.the.historical.importance.of.metal.machinery.in.industry,.many. of.the.initial.scientific.studies.of.friction.focused.on.contact.between.metal. surfaces.. Traditional,. scientifically. based. metallic. friction. theory,. formulated.in.the.1940s.and.1950s,.is.now.generally.accepted..Introductory.physics. courses.in.colleges.and.universities.present.the.laws.of.metallic.friction.in.a. simple,.straightforward.manner,.utilizing.the.metallic.coefficient-of-friction. equation.in.practical.applications..Unfortunately,.many.introductory.physics. textbooks.do.not.emphasize.to.the.reader.that.the.laws.of.metallic.friction.are. for.metal.on.metal.only.and.have.no.scientific.applicability.to.other.engineering.materials,.including.rubber.
