## Elementary Mechanics Including Hydrostatics and Pneumatics |

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### Common terms and phrases

angular acceleration angular velocity average velocity axis of rotation ball called centimetres centre of gravity centripetal acceleration centripetal force Chapter circle component compounded cubic cubic centimetre curvature curve diagram distance travelled dynes earth effect elastic energy equation equilibrium exerted falling body feet per second forces acting friction grammes hence horizontal hydrometer inches inertia initial velocity law of motion length liquid magnitude and direction mass measured mechanical advantage mercury moment of inertia momentum move multiplied number of forces parallel forces parallelogram particle pendulum plane polygon position pound poundals pressure produced proportional pull quantity of matter quantity of motion radius represents rest resultant right angles rigid body rotating body round sect shew sides simple specific gravity square straight line string suppose surface tension tion triangle tube uniform acceleration units of force v₁ value of g velocity gained vertical volume weight wheel whole

### Popular passages

Page 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.

Page 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.

Page 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.

Page 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.

Page 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.

Page 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.

Page 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,...

Page 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).

Page 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.