Explain, in one or two sentences, why the mechanical energy of a block being dragged…

PHYSICS · Subjective · AP · Physics 1: Algebra-based · Work Energy and Power · Work Energy and Power

Problem

Explain, in one or two sentences, why the mechanical energy of a block being dragged at constant speed by a horizontal force across a rough floor is not conserved.

Related theory

Energy Losses & Efficiency
Conservative & Non-Conservative Forces
Conservation of energy; conservative and non-conservative forces
Work, Energy and Power
Conservation of energy
Conservation of mechanical energy

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