# Elementary Mechanics Including Hydrostatics and Pneumatics

Chambers, 1879 - 203 σελίδες

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### Δημοφιλή αποσπάσματα

Σελίδα 199 - Prove that the algebraic sum of the moments of two concurrent forces about any point in their plane is equal to the moment of their resultant about the same point.
Σελίδα 55 - Reaction is always equal and opposite to action ; that is to say, the actions of two bodies upon each other are always equal and directly opposite.
Σελίδα 42 - Every body perseveres in its state of rest or of moving uniformly in a straight line, except in so far as it is made to change that state by external forces.
Σελίδα 199 - Two bodies start together from rest, and move in directions at right angles to each other. One moves uniformly with a velocity of 3 feet per second ; the other moves under the action of a constant force. Determine the acceleration due to this force if the bodies at the end of 4 seconds are 20 feet apart.
Σελίδα 166 - The density of a body is measured by its specific gravity, which represents the weight of a substance compared with the weight of an equal volume of water. It is a useful property in comparing relative weights of bodies.
Σελίδα 198 - Find the tension on a rope which draws a carriage of 8 tons weight up a smooth incline of 1 in 5, and causes an increase of velocity of 3 ft.
Σελίδα 2 - ... naturally adopted in what is to be studied without a teacher, so far from being a drawback in a school-manual, will, it is believed, be a positive advantage. Instead of a number of abrupt statements being presented, to be taken on trust and learned, as has been the usual method in school-teaching ; the subject is made, as far as possible, to unfold itself gradually, as if the pupil were discovering the principles himself, the chief function of the book being, to bring the materials before him,...
Σελίδα 53 - Tfte change of momentum of a body is numerically equal to the impulse which produces it, and is in the same direction," or momentum (mass x velocity) = impulse (force x time).
Σελίδα 200 - The value attached to each question is shown in brackets after the question. But a full and correct answer to an easy question will in all cases secure a larger number of marks than an incomplete or inexact answer to a more difficult one.