One end of a long uniform log is raised to shoulder level. An identical log is raised at its center to the same level. Raising the second log requires about

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Raising the second log requires lifting its entire mass to shoulder level, while raising the first log only involves lifting half its mass to the same level, with the other half progressively less. This means more work is done in the second case, approximately twice as much, due to the distribution of mass and the distance it is moved against gravity.

One End of a Long Uniform Log Is Raised to Shoulder