What is meant by kinetically equivalent system and what is its application?. The connecting rod of a gasoline engine is 30 cm long between its centres. It has a mass of 1.5 kg and mass-moment of inertia of 70kg-cm2. It centre of gravity is at 20 cm from its small-end centre. Determine the kinetically equivalent 2-mass system of the connecting rod if one of the masses is located at small-end centre.