A 2.0 kg block is dragged at constant speed across a rough horizontal floor by a 10 N…
PHYSICS · Subjective · CBSE · Physics · Work and Energy · Work and Energy
Problem
A 2.0 kg block is dragged at constant speed across a rough horizontal floor by a 10 N horizontal force over 3.0 m. A classmate claims that if the system is taken to be the block plus Earth, the mechanical energy of the system is conserved because the block’s speed is unchanged. Evaluate this claim and, in one or two sentences, explain what the analysis overlooks about energy transfers.