Matter and Motion |
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Page 56
... round its area appears to be the direction of the motion of the hands of a watch . If the area is not in one plane , the path of the particle must be divided into portions so small that each coincides sensibly with a straight line , and ...
... round its area appears to be the direction of the motion of the hands of a watch . If the area is not in one plane , the path of the particle must be divided into portions so small that each coincides sensibly with a straight line , and ...
Page 57
... round the origin in the direction of the hands of a watch . Hence the rate of change of the angular momentum of a particle about the origin is measured by the moment of the force which acts on the particle about that point . The rate of ...
... round the origin in the direction of the hands of a watch . Hence the rate of change of the angular momentum of a particle about the origin is measured by the moment of the force which acts on the particle about that point . The rate of ...
Page 85
... round the sun in a year at a distance of 91,520,000 miles , or 1 · 473 × 1013 centimetres . It follows from this that a force is exerted on the earth in the direction of the sun , which produces an acceleration of the earth in the ...
... round the sun in a year at a distance of 91,520,000 miles , or 1 · 473 × 1013 centimetres . It follows from this that a force is exerted on the earth in the direction of the sun , which produces an acceleration of the earth in the ...
Page 88
... round its axis , we may account for its oblate figure , and for the equili- brium of the ocean and of all other bodies on its sur- face on either of two hypotheses - that of the motion of the earth round its axis , or that of the earth ...
... round its axis , we may account for its oblate figure , and for the equili- brium of the ocean and of all other bodies on its sur- face on either of two hypotheses - that of the motion of the earth round its axis , or that of the earth ...
Page 89
James Clerk Maxwell. ABSOLUTE ROTATION . 89 the bucket spinning round a vertical axis , the water will soon spin round at the same rate as the bucket , so that the system of the water and the bucket turns round its axis like a solid body ...
James Clerk Maxwell. ABSOLUTE ROTATION . 89 the bucket spinning round a vertical axis , the water will soon spin round at the same rate as the bucket , so that the system of the water and the bucket turns round its axis like a solid body ...
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Common terms and phrases
angular momentum ARTICLE attraction axis called centimetres centre of mass change of velocity circle configuration and motion constant corresponding deduce defined deflexion depends Descartes described diagram of displacements diagram of velocities distance ditto dynamical earth effect equal and opposite equal masses equilibrium exerted experiment experimental pendulum external agent external forces foot-pounds force acting given instant gramme gravitation heat Hence hodograph intensity of gravity interval Kepler's KEPLER'S THIRD LAW kinetic energy law of motion length magnets mass equal mass-area mass-vector material particle material system measured method moving mutual action Newton observed orbit origin parallel phenomena physical science planet portions of matter position potential energy pound poundals produce quantity rate of acceleration relative represent respect rotation SECOND LAW simple pendulum space straight line stress string THIRD LAW tion torsion balance total acceleration unit of mass vector vibration wire
Popular passages
Page 54 - 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 38 - 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 60 - The total energy of any material system is a quantity which can neither be increased nor diminished by any action between the parts of the system, though it may be transformed into any of the forms of which energy is susceptible...
Page 21 - The difference between one event and another does not depend on the mere difference of the times or the places at which they occur, but only on differences in the nature, configuration, or motion of the bodies concerned.
Page 35 - 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 87 - Rise on the earth, or earth rise on the sun, He from the east his flaming road begin ; Or she from west her silent course advance With inoffensive pace, that spinning sleeps On her soft axle, while she paces even, And bears thee soft with the smooth air along, Solicit not thy thoughts with matters hid ; Leave them to God above, him serve and fear.
Page 59 - act of producing a change of configuration in a system in opposition to a force which resists that change.
Page 114 - ... bodies is proportional to the product of their masses divided by the square of the distance between them.
Page 60 - The doctrine of the conservation of energy is the one generalized statement which is to be found consistent with fact, not in one physical science only, but in all. When once apprehended it furnishes to the physical inquirer a principle on which he may hang every known law relating to physical actions, and by which he may be put in the way to discover the relations of such actions in new branches of science.
Page 20 - All our knowledge, both of time and place, is essentially relative. When a man has acquired the habit of putting words together, without troubling himself to form the thoughts which ought to correspond to them, it is easy for him to frame an antithesis between this relative knowledge and a so-called absolute knowledge, and to point out our ignorance of the absolute position of a point as an instance of the limitation of our faculties.