A vibrating system with one degree of freedom that can be employed to predict a nature of motion with impacts of certain systems with heavy mass of elastic elements is subject to investigations. An example of such a system is a heavy cantilever beam with a mass impacting on the base, fixed at its end. The applicability limits of two ways of modelling impacts described as hard impacts and soft impacts, as well as advantages and disadvantages of both the ways have been presented below.
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