The book The Advance of Science in the Last Half-Century was written by author Huxley Thomas Henry Here you can read free online of The Advance of Science in the Last Half-Century book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Advance of Science in the Last Half-Century a good or bad book?
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Hence thephrase _energy of position_, which is frequently used as equivalent topotential energy. If a stone is picked up and held, say, six feetabove the ground, it has _potential energy_, because, if let go, itwill immediately begin to move towards the earth; and this energy maybe said to be _energy of position_, because it depends upon therelative position of the earth and the stone. The stone is solicitedto move but cannot, so long as the muscular strength of the holderprevents the solicitat...ion from taking effect. The stone, therefore, has potential energy, which becomes kinetic if it is let go, and theamount of that kinetic energy which will be developed before itstrikes the earth depends on its position--on the fact that it is, say, six feet off the earth, neither more nor less. Moreover, it canbe proved that the raiser of the stone had to exert as much energy inorder to place it in its position, as it will develop in falling. Hence the energy which was exerted, and apparently exhausted, inraising the stone, is potentially in the stone, in its raisedposition, and will manifest itself when the stone is set free.
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