 | John Keill - 1745 - 352 頁
...to CA, the Diftance of the Direction of the Power from the Fulcrum, the Power will be to the Weight, as the Velocity of the Weight to the Velocity of the Power; the Momentum therefore of the Power [by Cor. 3. Theor. 3.] will be equal to the Momentum of the Weight:... | |
 | Benjamin Martin - 1747 - 398 頁
...both for Prtf. fure and rtifing of Weights, but chiefly the former.. mer. 'The Power is to the Weight, as the Velocity of the Weight to the Velocity of the Power, that is, as the Diftance between two Threads of the Screw to the Circumference of a Circle described... | |
 | Colin MacLaurin - 1750 - 474 頁
...confidering one of them as the power and the other as the weight, the power will be to the weight, as the velocity of the weight to the velocity of the power. Therefore in this, as in all mechanical engines, when a finall power raifes a great weight, the velocity... | |
 | William Emerson - 1769 - 370 頁
...one another. And the fame is true of wheels carried about by ropes. For the power is to the weight ; as the velocity of the weight to the velocity of the power. And the number- of teeth in the wheels and pinions, that drive one another, are as the diameters. And... | |
 | William Emerson - 1769 - 170 頁
...one another. And the fame is true of wheels carried about by ropes. For the power is to the weight ; as the velocity of the weight to the velocity of the power. And the number of teeth in the wheels and pinions, that drive one another, are as the diameters. And... | |
 | William Emerson - 1793 - 386 頁
...one another. And the fame is true of wheels carried about by ropes. For the power is to the weight; as the velocity of the weight to the velocity of the power. And the number of teeth in the wheels and pinions, that drive one another, are as the diameters. And... | |
 | George Adams - 1794 - 540 頁
...power and the refiftance ; for the power always balances the weight, when it is in the fame proportion as the velocity of the weight to the velocity of the power. Or, 2. By fetting . down the ratios of the power to the weight on each mechanical power, the fum of... | |
 | Nicolas Pike - 1808 - 470 頁
...descent. OF THE LEVER OR STEELYARD. 86. It is a principle in mechanicks, that the power is to the weight, as the velocity of the weight, to the velocity of the power. Therefore, to find what weight may be raised or balanced by any given power, say ; , As the distance... | |
 | John Ewing - 1809 - 672 頁
...consequence passed over two feet. Therefore to constitute an equilibrium, the power being to the weight as the velocity of the weight to the velocity of the power, one will be double to the other. If the rope therefore instead of being held in the hand above, pass... | |
 | James Smith - 1815 - 684 頁
...or weight; for the power always Wheel-work. balances the weight, when it is in the same proportion as the •velocity of the weight to the velocity of the power. Or, divide the machine into all the simple ones of which it is formed ; then begin at the power nnd... | |
| |
The mechanical advantage of the wheel and axle, or crane, is as the velocity of the weight to the velocity of the power ; and, being only a modification of the first kind of lever, it of course partakes of the same principles. 
