In a certain position, it will hold that position, even if there is a The smooth muscles work very slowly, but theyĬan hold a “set” that is to say, if the clam tries to close its shell Is like the muscle in the intestines or, in the clam, the greaterĪdductor muscle that closes the shell. Skeletal muscle, is the type of muscle we have in our arms, forĮxample, which is under voluntary control the other kind, called Other animals: one kind, called striated or
There are two kinds of muscles in the human body and in Weight at the same height! The physiological situation is something like Up with no effort by just placing it on a table then the table, quietlyĪnd calmly, without any supply of energy, is able to maintain the same Throttle, just to hold the weight up? Actually, the weight could be held
#EXMAPLES OF CLAULCULATING THE WORKDONE ON A PARTICEL FULL#
The weight up? Why is the machinery inside him operating at full Why should he sweat? Why should he need to consume food to hold It is a fact that when one holds a weight he has to do “physiological” That no work whatsoever is done by a force which is at right angles to the The component of displacement in the direction of force times $F$. The rule is “force times distance,” but we really mean only the component ofįorce in the direction of the displacement times $\Delta s$ or, equivalently, If,įor instance, the force were constant and the displacement were a finiteĭistance $\Delta\FLPs$, then the work done in moving the object through thatĭistance is only the component of force along $\Delta\FLPs$ times $\Delta s$. The component of force in the direction of the displacement does any work. Which the force is working is displaced in a certain direction, then only Means that if the force, for instance, is in one direction and the object on Physical work is expressedĪs $\int\FLPF\cdot d\FLPs$, called “the line integral of $F$ dot $ds$,” which Physical word “work” is not the word in the ordinary sense of “Workers of the The first idea that has to be digested is work done by a force. Mathematical procedures or “tricks” that one has not seen before,Īttention should be given not to the trick exactly, but to the Proof, is not the proof itself, but rather that it can be shown Shortest amount of time! The thing to be remembered, when seeing a Neatest way, so as to be able to show that it can be shown in the Simple, when in fact, the author might have worked for hours tryingĭifferent ways of calculating the same thing until he has found the Consequently, the proof may look deceptively In almost all cases, the particular proof that is used isĬoncocted, first of all, in such form that it can be written quickly andĮasily on the chalkboard or on paper, and so that it will be as In any particular circumstance we canĮither say “it can be shown that” such and such is true, or we can Clearly, the important thing to learn and to remember is It is easy to confuse the proof itself with the relationship which Relationships which can be “proved” or “shown” to exist between In the memory a huge body of facts and ideas, held together by certain Role, one is confronted with the task of understanding and storing away In learning any subject of a technical nature where mathematics plays a 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.
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