![]() Rotation: something else is involved in the operation of a pendulumĬlock besides the machinery of the clock, something outside it that we Therefore we can make a predictionĪbout pendulum clocks if we believe in the symmetry of physical law for The theorem is thenįalse in the case of the pendulum clock, unless we include the earth, Stands upright, it works fine, but if it is tilted the pendulum fallsĪgainst the side of the case and nothing happens. Not if it is a Grandfather clock, for example! If a pendulum clock It up on an angle, will it operate in the same way? Obviously it will Watch it operate, and nearby we build the same kind of apparatus but put In other words, if we build a piece of equipment in some place and It should make no difference in which direction we choose theĪxes. The above is the first of a series of ever more complicated propositionsĬoncerning the symmetry of a physical law. ![]() These would be the relationships between quantities as seen by Joe and Same projection as Joe would use, so we have a set of equations Now we see that Moe would use exactly the $x$-direction, which is the magnitude of the force times this cosine of The force is supposed to act along some line, and by theįorce in the $x$-direction we mean the part of the total which is in the Now in order to complete our analysis we must know what Moe would obtainįor the forces. Order to distinguish it, we will call it $x'$), and in principle aĭifferent $y$, although in our example they are numerically equal. Hand, when measuring the same point, will obtain a different $x$ (in Out because it is too confusing to draw in a picture). In space, he finds it at $x$, $y$, and $z$ (we shall usually leave $z$ Now when Joe measures the location of the point Moe, who has a parallel system whose origin is somewhere else That there are two people-Joe, who has an origin in one place, and Some other origin it would make no difference. Show immediately that we can never find the center, because if we use That there is some place that we can measure from, perhaps theĬenter of the universe, such that these laws are correct. Some origin, but where do we put the origin? All that Now this means that there exists a way to measure $x$, $y$,Īnd $z$ on three perpendicular axes, and the forces along thoseĭirections, such that these laws are true. Mechanics can be summarized by a set of three equations for each In previous chapters we have seen that the laws of We shall limit our analysis to just mechanics, for which we now have Mike The Feynman Lectures on Physics New Millennium Edition Your time and consideration are greatly appreciated. So, if you can, after enabling javascript, clearing the cache and disabling extensions, please open your browser's javascript console, load the page above, and if this generates any messages (particularly errors or warnings) on the console, then please make a copy (text or screenshot) of those messages and send them with the above-listed information to the email address given below.īy sending us information you will be helping not only yourself, but others who may be having similar problems accessing the online edition of The Feynman Lectures on Physics. This type of problem is rare, and there's a good chance it can be fixed if we have some clues about the cause. which operating system you are using (including version #).which browser you are using (including version #). ![]() If it does not open, or only shows you this message again, then please let us know: So, please try the following: make sure javascript is enabled, clear your browser cache (at least of files from ), turn off your browser extensions, and open this page: If you use an ad blocker it may be preventing our pages from downloading necessary resources. If you have have visited this website previously it's possible you may have a mixture of incompatible files (.js. ![]() In order to read the online edition of The Feynman Lectures on Physics, javascript must be supported by your browser and enabled. There are several reasons you might be seeing this page. ![]()
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