Lecture Notes on Mechanics, Sound and Light

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George Wahr, 1890 - Physics - 132 pages
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Page 23 - 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 23 - First law, 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 23 - 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.
Page 26 - moment of a force" with respect to a point is the product of the force and the perpendicular distance from the given point to the line of action of the force.
Page 38 - Show that the moment of inertia of a body about any axis is equal to the moment of inertia about a parallel axis through...
Page 102 - ... turned through any angle about an axis perpendicular to the plane of incidence, the reflected ray will be turned through an angle just twice as great.
Page 24 - ... work done is measured by the product of the Force and the Distance moved in the direction of the force. Thus if a force of 10 Ib. moves a body 2 ft. (along its line of action), it does 20 ft.
Page 61 - ... motion which may be perceived by the ear. According to this definition sound may exist entirely independent of an ear to perceive or a brain to comprehend. 103. Origin of Sound. Sound originates in a vibrating body. " Sound and movement," says Blaserna, " are so correlated that one is strong when the other is strong, one diminishes as the other diminishes, and the one stops when the other stops.
Page 24 - Work is the act of producing a change of configuration in a system in opposition to a force which resists that change.
Page 22 - The mass of a body is the quantity of matter it contains.

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