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1. Introduction; 2. Summary and aim of this lecture; 3. Some roles of measurements; 3.1. Galileo was suddenly loosing any interest in the measurement or in the instruments he was using or improving, as soon the general pattern of the law appeared in his mind; 3.2. What is the form of the “force” in a moving body with mass? Where is the energy of a body at rest stored? What is the difference between the “dead force” and the force “alive”, in other terms what is the quantity of interest: kinetic energy, motion quantity, energy, pulse? 3.3. Very early measurements of the equivalence principle; 4. Some roles of instruments, the special case of pendula; 4.1. External conditions fostering the birth of a new instrument; 4.2. Why also pendula are to be considered; 4.3. Metrological application of pendula; 5. Conclusions
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