# Principles of mechanics

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Сторінка 15 - Motion, 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.
Сторінка 22 - Change of motion is proportional to the impressed force, and takes place in the direction of the straight line in which the force acts.
Сторінка 185 - ... on the area of the base and the depth of its centre of gravity below the surface of the liquid Ex.
Сторінка 185 - ... is equal to the area of the surface, and altitude equal to the depth of the centre of gravity of the surface below the surface of the fluid.
Сторінка 40 - To every action there is always an equal and contrary reaction; or, the mutual actions of any two bodies are always equal and oppositely directed in the same straight line.
Сторінка 26 - ... units of force and mass in order that the student may be able to compare the absolute and gravitation measures. Def. In gravitation measure, forces are measured by the weights they will support. The unit is a pound weight, whence a force which will support 3 pounds is represented by the number 3. Def. In gravitation measure the unit of mass is the quantity of matter in a body weighing g pounds. This is an arbitrary assumption, liable to the objection that the unit changes with the locality, but...
Сторінка 119 - That the quantity of heat produced by the friction of bodies, whether solid or liquid, is always proportional to the quantity of force expended.
Сторінка 181 - The specific gravity of a petroleum oil and of mixtures of petroleum products with other substances is the ratio of the weight of a given volume of the material at a temperature of 60° F.