The General Law of Machines
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
p-97
2025-11-05
43
The work of a machine consists in the overcoming of some force, which we call resistance or weight, while the force applied in operating the machine is called effort or power. A law that is applicable to all machines is: The power multiplied by the distance through which it acts is equal to the resistance multiplied by the distance through which it is moved; or,
Pd = RD.
Each machine has its own law, which is generally more convenient than the above. But this law is general, and may be applied to any machine or combination of machines. It is evident that the R in Formula 29 should include the friction of the machine as well as the resistance to be overcome in useful work; but in most problems in simple machines we consider only the conditions of static equilibrium, and neglect the friction.
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