Frictionless inclined plane right|thumb|Instrumented inclined plane used for physics education, around 1900. The lefthand weight provides the load force . The righthand weight provides the input force pulling the roller up the plane.
Frictionless inclined plane right|thumb|Instrumented inclined plane used for physics education around 1900 The lefthand weight provides the load force  The righthand weight provides the input force pulling the roller up the plane