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The concepts of bare and effective mass are widely used within modernphysics. Their meaning is discussed in advanced undergraduate and graduatecourses such as solid state physics, nuclear physics and quantum field theory.Here, I discuss how these concepts may be introduced, at a very early stage,together with the discussion of Newton's second law of motion for a slidingblock. The setting up of a simple equation for the effective mass will allowinstructors to discuss how external parameters, such as the temperature,influence this quantity. By developing the same equation as a power series onemay also discuss perturbation theory and introduce Feynman diagrams.Comment: Eur. J. of Phys. (accepted). 10 pages, 6 figures. Intended to help  people teaching particle physics, quantum field theory, etc. This version  contains new section

Introducing the notion of bare and effective mass via Newton's second law of motion