Abstract: We present and discuss a selection of classical mechanics and thermodynamics problems. The discussion is based on the use of the impulse-momentum equation simultaneously with the centre-of-mass (pseudo-work) equation or the first law of thermodynamics, depending on the nature of the problem. Thermodynamical aspects of classical mechanics, namely problems involving non-conservative forces or variation of mechanical energy are discussed in different reference frames, in connection with the use of one or other of the energy equations, and also compliance with the principle of relativity.

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