First Lessons in Theoretical Mechanics

Longmans, Green and Company, 1874 - 253 σελίδες

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Δημοφιλή αποσπάσματα

Σελίδα 187 - Whatever draws or presses another is as much drawn or pressed by that other. If you press a stone with your finger, the finger is also pressed by the stone. If a horse draws a stone tied to a rope, the horse (if I may so say) will be equally drawn back towards the stone...
Σελίδα 186 - Every body continues in its state of rest or of uniform motion in a straight line, except in so far as it may be compelled by impressed forces to change that state.
Σελίδα 187 - Change of momentum is proportional to the impressed moving force, and takes place along the straight line in which that force is impressed.
Σελίδα 110 - Each wagon contains two and a quarter cubic yards. The result is, that each man has to lift nearly twenty tons weight of earth on a shovel over his head into a wagon. The height of the lifting is about six feet. This is taking it at fourteen sets a day ; but the navvies sometimes contrive to get through sixteen sets, and there are some men who will accomplish that astonishing quantity of work by three or four o'clock in the afternoon — a result, I believe, which is not nearly equalled by the workmen...
Σελίδα 160 - ... the resultant velocity will be represented in magnitude and direction by the diagonal, drawn from that point, of the parallelogram constructed on the two straight lines as adjacent sides.
Σελίδα 50 - ... the sum of the moments of the forces which tend to turn the body in one direction must be equal to the sum of the moments of those which tend to turn it in the opposite direction about the same axis.
Σελίδα 187 - To every action there is always opposed an equal reaction; or, the mutual actions of two bodies on each other are always equal and directed to contrary parts.
Σελίδα 92 - Every engineer knows that the work done by a force has to be measured by multiplying together the force and the distance through which its point of application moves forward.
Σελίδα 3 - The ratio of the mass of any quantity of a substance to the mass of an equal volume of some standard substance. In the case of solids and liquids the latter is chosen as water at 4° C.
Σελίδα 110 - set is a number of wagons — in fact, a train. There are two men to a wagon. If the wagon goes out fourteen times, each man has to fill seven wagons in the course of the day. Each wagon contains two and a quarter cubic yards. The result is, that each man has to lift nearly twenty tons weight of earth on a CHAP, shovel over his head into a wagon.

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