Natural philosophy. Mechanics, Τόμος 1Murby, 1873 |
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Σελίδα 6
... pound avoirdupoise . To determine the mass of any body , we must find how many units of mass it contains . This is done by weighing it . 3. Units of time . - The standard unit of time is the mean duration of a revolution of the earth ...
... pound avoirdupoise . To determine the mass of any body , we must find how many units of mass it contains . This is done by weighing it . 3. Units of time . - The standard unit of time is the mean duration of a revolution of the earth ...
Σελίδα 20
... pound weight . Hence a force of six pounds is said to be twice as great as a force of three pounds . Statical forces are therefore measured by the pressure they exert . Equal Forces . - Forces are said to be equal if their intensities ...
... pound weight . Hence a force of six pounds is said to be twice as great as a force of three pounds . Statical forces are therefore measured by the pressure they exert . Equal Forces . - Forces are said to be equal if their intensities ...
Σελίδα 21
... pound , a line of three inches will represent a force having an intensity of three pounds ; and , moreover , the direction of the line will represent the direction of the force , and an arrow - head will show which way it acts ...
... pound , a line of three inches will represent a force having an intensity of three pounds ; and , moreover , the direction of the line will represent the direction of the force , and an arrow - head will show which way it acts ...
Σελίδα 36
... pounds , its effect upon the earth is practically nothing . Parallelism of Gravity . - As the force of gravity acts in straight lines towards the centre of the earth , these lines are necessarily converging lines , the point of ...
... pounds , its effect upon the earth is practically nothing . Parallelism of Gravity . - As the force of gravity acts in straight lines towards the centre of the earth , these lines are necessarily converging lines , the point of ...
Σελίδα 44
... pound ; so that when we talk of a horse pulling with a force of 150 lbs . , or the wind blowing with a force of 5 lbs . to the square foot , we mean that the horse pulling at one end of a rope passing over a pulley would just balance a ...
... pound ; so that when we talk of a horse pulling with a force of 150 lbs . , or the wind blowing with a force of 5 lbs . to the square foot , we mean that the horse pulling at one end of a rope passing over a pulley would just balance a ...
Άλλες εκδόσεις - Προβολή όλων
Natural Philosophy: Part 1, Mechanics (1873) J. Alfred Skertchly Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2008 |
Συχνά εμφανιζόμενοι όροι και φράσεις
acceleration angle of repose attached axis beam body moves called central force centre of gravity centrifugal force circle circumference continuous circular motion curve cylinder descend diameter direction distance earth effect equal equilibrium exerted falling body feet per second fixed point foot-pounds force of gravity forces acting friction fulcrum Hence horizontal impact inches inclined plane isochronous kinetic energy length lever lifted machine mechanical efficiency miles per hr movable block multiplied number of seconds number of units oscillation parabola parallel forces parallelogram particle passive force path perpendicular pitch position pounds pounds weight pressure produce projectile proportional pulley radii radius raise ratio rectilinear motion represent resistance rest resultant revolution revolve rope passing round screw sheave simple pendulums space square stone surface suspended teeth tons triangle upper block velocity vertical vibrate wedge wheel and axle
Δημοφιλή αποσπάσματα
Σελίδα 41 - Newton's Three Laws of Motion," and are as follows: (1) All bodies continue in a state of rest, or of uniform motion in a straight line, unless acted upon by some external force that compels a change.
Σελίδα 15 - To find the area of a trapezoid. RULE. Multiply half the sum of the two parallel sides "by the perpendicular distance between them : the product will be the area.
Σελίδα 87 - This proportion teaches us that, when in equilibrium, the power is to the weight as the height of the plane is to its length.
Σελίδα 41 - First. A body in motion, and not acted upon by any external force, will move with a uniform velocity in a straight line.
Σελίδα 59 - 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 48 - Hence it is evident, that in every species of lever there will be an equilibrium, when the power is to the weight as the distance of the weight from the fulcrum is to the distance of the power from the fulcrum.
Σελίδα 32 - The perpendicular distance between the lines of action of the two forces is called the arm, and the product of one of the forces and the arm is called the moment of the couple.
Σελίδα 134 - The force is proportional to the square of the velocity and inversely proportional to the radius of turn during radial acceleration.
Σελίδα 46 - These machines are ; 1. the lever; 2. the wheel and axle ; 3. the pulley ; 4. the inclined plane ; 5. the wedge ; and 6. the screw.
Σελίδα 28 - If three forces, acting at a point, be represented in magnitude and direction by the sides of a triangle taken in order, they will be in equilibrium...