By Wilhelm H Westphal
This ebook is a translation of the sixth to eighth variation of the author's Kleines Lehrbuch der Physik. The circle of readers to which it hopes to charm and the author's goal in writing it were set out within the Preface to the 1st German version, released in 1948. the current ebook regularly follows the foundations of the speculation of amounts, the beginnings of which date again to James C. Maxwell. which means in all equations during this publication the symbols perpetually stand for actual amounts and never for the numerical values of amounts. simply then are the equations gene rally legitimate and self sustaining of the alternative of devices utilized in their review. The devices used are regularly the "metric" devices which were gaining flooring more and more additionally within the English-speaking international locations. A conversion desk for many of the extra very important Anglo-American devices is given on web page XIV. i want to checklist my honest gratitude to Mr. Ewald Osers for his pains taking paintings in making this translation and to Mr. P. C. Banbury, Ph. D., of the dep. of Physics, collage of studying, England, either for the recommendation he has given hirn all through and for devising the issues in particular for this version.
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Extra info for A Short Textbook of Physics: Not Involving the Use of Higher Mathematics
The center of gravity. Theorem of the center of gravity 19 If the primary force is applied obliquely to its area of application, the reaction produced is determined merely by the perpendicular component of the primary force. If a body is placed on an inc1ined plane the perpendicular component ~2 of its weight ~ produces in the plane a balancing reaction ~2 = - ~2 (Fig. 16a). In actual fact, the body is subjected to the two forces ~ and ~" and the component ~1 of ~ (a component parallel to the inc1ined plane) is the resultant of those two forces (Fig.
1) this acceleration can also be measured. All acceleration meters are based on this principle. ~ ~ Oirecfion in whieh frain~g AeeBlerofion Fig. 21. Inertia illustrated when the brakes of a train are applied The concept of inertial forces is often very useful - not only in the accelerated translation but also in the rotation ofa system ofreference, since (under Section 9) rotation is also accelerated motion. In ordinary life we often find ourselves in the position of an observer at rest in an accelerated system, describing our observations in terms of such a system.
31). This requires that 33. Moment of inertia 39 tancjJ=vZ/(rg), where r is the radius ofthe track. In cycIing, whenever we happen to tip a little to the right we make a small right-hand turn to enable the centrifugal force to correct us again. In order to gain the list to the right necessary for a righthand turn - when a component of gravity supplies the required centripetal force- Fig. 31. Banked curve of a fast highway we first make a slight left-hand turn. This brings into play the centrifugal force directed to the right which we require for the necessary sideways list.