Answer:
Classical physics mainly deals with macroscopic phenomena which may be at the laboratory, terrestrial and astronomical scales. Here the particle size \[>{{10}^{-8}}m\]and particle velocity\[<<{{10}^{8}}m/s.\]. Here we need not consider strong or weak nuclear forces. Gravitational and electromagnetic forces are sufficient to explain these macroscopic phenomena. On the other hand, quantum mechanics deals with microscopic phenomena at the minute scales of atoms, molecules and nuclei. Here the strong and weak nuclear forces become dominant.
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