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acting action angle applied axis balance beam becomes body called cause centre of gravity compressed Conceive constant curve cylinder depth described diameter direction distance drawing effect energy engine equal equilibrium example experiment falling feet fluid follows force friction given heat Hence horizontal inches inclined increase iron length lever lifting liquid load mass matter means measure mechanical mercury minute motion move observed obtain parallel pass perpendicular piston placed plane portion position pounds pressure principle produces pull pump quantity raised represented resistance respectively rest resultant rises rotation round Science shown shows side solid space square steam straight strain string surface tons triangle true tube unit valve varies velocity vertical vessel volume weight wheel
Σελίδα 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.
Σελίδα 185 - ... on the area of the base and the depth of its centre of gravity below the surface of the liquid Ex.
Σελίδα 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.
Σελίδα 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.
Σελίδα 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...
Σελίδα 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.