Quotation from: General ScienceWritten by: Bertha M. Clark |
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When the roller is raised along the incline, the balance registers a pull only one fourth as great as the actual weight of the roller. That is, when the roller weighs 12, a force of 3 suffices to raise it to the height _A_ along the incline; but the smaller force must be applied throughout the entire length of the incline. In many cases, it is preferable to exert a force of 30 pounds, for example, over the distance _CA_ than a force of 120 pounds over the shorter distance _BA_.
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