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### Περιεχόμενα

 INTRODUCTION 1 The Lever 16 APPENDIX TO THE STATICS 77
 Forces 106 DYNAMICS 132 Moving Force 163

### Δημοφιλή αποσπάσματα

Σελίδα 35 - If three forces, represented in magnitude and direction by the sides of a triangle, act on a point, they will keep it at rest.
Σελίδα 148 - Therefore the velocities of falling bodies are proportional to the times of their falls. QED , Prop. II. The spaces described by the fall of a body are as the squares of the times, from the beginning of the fall. Let...
Σελίδα 22 - The Lever, Definition of Lever. Axioms. Prop. 1. A horizontal prism or cylinder of uniform density will produce the same effect by its weight as if it were collected at its middle point.
Σελίδα 34 - If a moving point possess simultaneously velocities which are represented in magnitude and direction by the two sides of a parallelogram drawn from a point, they are equivalent to a velocity which is represented in magnitude and direction by the diagonal of the parallelogram passing through the point.
Σελίδα 36 - If any number of forces acting at a point can be represented in magnitude and direction by the sides of a POLYGON taken in order, they are in equilibrium.
Σελίδα 99 - 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 24 - If two forces acting perpendicularly on a straight lever in opposite directions and on the same side of the fulcrum balance each other, they are inversely as their distances from the fulcrum ; and the pressure on the fulcrum is equal to the difference of the forces.
Σελίδα 32 - Definition of Component and Resultant Forces. Prop. 8. If the adjacent sides of a parallelogram represent the component forces in direction and magnitude, the diagonal will represent the resultant force in direction and magnitude.
Σελίδα 102 - But of all the modes of communicating motion, the most extensively useful is the employment of wheelwork, which is capable of varying its direction and its velocity without any limit. Wheels are sometimes turned by simple contact with each other ; sometimes by the intervention of cords, straps, or chains, passing over them ; and in these cases the minute protuberances of the surfaces, or whatever else may be the cause of friction, prevents their sliding on each other.
Σελίδα 3 - M any cause which moves or tends to move a body, or which changes or tends to change its motion.