The fatigue produced on the muscles of the human frame does not altogether depend on the actual force employed in each effort, but partly on the frequency with which it is exerted.CQuote by Charles Babbage about force
The force of vapour is another fertile source of moving power; but even in this case it cannot be maintained that power is created.CQuote by Charles Babbage about force
When a mass of matter is to be removed a certain force must be expended; and upon the proper economy of this force the price of transport will depend.CQuote by Charles Babbage about force