# The Principles of Mechanics: Designed for the Use of Students in the University

J. Smith, 1818 - 211 σελίδες

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### Δημοφιλή αποσπάσματα

Σελίδα 4 - The idea of solidity we receive by our touch: and it arises from the resistance which we find in body to the entrance of any other body into the place it possesses, till it has left it. There is no idea which we receive more constantly from sensation than solidity.
Σελίδα 4 - ... of any other body into the place it possesses, till it has left it. There is no idea which we receive more constantly from sensation than solidity. Whether we move or rest, in what posture soever we are, we always feel something under us that supports us, and hinders our farther sinking...
Σελίδα 64 - There is an equilibrium upon the wheel and axle when the power is to the weight as the radius of the axle to the radius of the wheel.
Σελίδα 41 - If three forces acting at a point are in equilibrium they can be represented in magnitude and direction by the three sides of a triangle taken in order.
Σελίδα 19 - Prop. 19. — 1st. If a body be at rest it will continue at rest, and if in motion, it will continue to advance uniformly in a right line, unless compelled to change its state by some external force, pp.
Σελίδα 25 - ... (3) To every action there is an equal and opposite reaction; or the mutual actions of two bodies are always equal and oppositely directed.
Σελίδα 152 - If chords be drawn in a circle from the extremity of that diameter which is perpendicular to the horizon, the VELOCITIES which bodies acquire in falling through them, are proportional to their lengths ; and the TIMES of describing these chords are all equal to one anotfier, and are severally equal to the time of describing the diameter.
Σελίδα 50 - If two weights balance each other upon a straight Lever, the pressure upon the fulcrum is equal to the sum of the weights, whatever be the length of the Lever.
Σελίδα 104 - AM 18. If any momenta be communicated to the parts of a system, its center of gravity will move in the same manner that a body equal to the sum of the bodies in the system would move, were it placed in that center, and the same momenta communicated to it, in the same directions.
Σελίδα 69 - In a system in which the same string passes round any number of pulleys and the parts of it between the pulleys are parallel, there is an equilibrium when Power (P) : Weight (W) :: 1 : the number of strings at the lower block.