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AP Physics C: Mechanics
3.4 Conservation of Energy
3.2 Work
3.1 Translational Kinetic Energy
IntermediateMCQConceptual18k
A horizontal line represents a frictionless floor. On the floor sits a rectangular block labeled \(M\). The block has horizontal hash marks indicating internal compressibility. A single horizontal arrow pointing to the right labeled \(F\) makes contact with the left vertical edge of the block. Below the floor line, two horizontal dimension lines with arrowheads extend from the initial position to the final position: the upper dimension line is labeled \(d_{\text{app}}\) and aligns with the left edge of the block, while the lower dimension line is labeled \(d_{\text{cm}}\) and aligns with a dot at the center of the block. The line for \(d_{\text{app}}\) is visibly longer than the line for \(d_{\text{cm}}\). No other labels, lines, text, or axes appear.
A compressible block of mass \(M\) subjected to a constant horizontal force \(F\).
A block of compressible foam of mass \(M\) is pushed along a horizontal, frictionless surface by a constant horizontal external force of magnitude \(F\) applied to its rear surface. As the block accelerates, internal friction causes it to permanently compress, so the point of application of \(F\) displaces by a distance \(d_{\text{app}}\) while the center of mass of the block displaces by a shorter distance \(d_{\text{cm}}\). During this process, how does the internal thermal energy of the block change, and what is the correct physical justification?

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