Energy
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
P-71
2025-11-03
43
The head of a pile driver (Fig. 1) falling upon a pile forces the pile into the ground to a depth which depends upon the weight of the head and the Increase either, and its capacity for doing work, that is, its energy, is increased, and the pile is driven farther into the ground. If we watch the engine of a pile driver while it is pulling the iron head to the top of the frame, we shall see that it is doing work. When the head has been raised and is held in position, the work of the engine stops, but the steam pressure is still there ready to be used at short notice. Steam under pressure is said to possess energy. Energy may be defined as the capacity for doing work. It is measured by the amount of work it is capable of doing.
FIG. 1.- Pile Driver
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