Principles of MechanicsLongmans, Green, 1874 - 313 pages |
Contents
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Common terms and phrases
action angle angle of repose angular angular velocity apparatus atmosphere axis axle beam body Boyle's law centre of gravity compressed Conceive constant crane curve cylinder density depth described diagram diameter direction disc drawing elasticity engine equal equilibrium forces acting friction fulcrum gases gauge heat Hence horizontal plane inches of mercury inclined inclined plane increase iron length lever lifting lifting force liquid load mass mechanical molecules motion move P₁ perpendicular pipe piston plunger portion pound weight pounds principle Prop pull pulley pump quantity radius represented resistance rest resultant revolutions per minute rotation Science Exam screw side solid space specific gravity square inch steam straight line string surface temperature tension tons triangle true plane tube valve velocity vertical vessel volume weight wheel
Popular passages
Page 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.
Page 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.
Page 185 - ... on the area of the base and the depth of its centre of gravity below the surface of the liquid Ex.
Page 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.
Page 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.
Page 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...
Page 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.
Page 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.