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# Basic Physics Lecture 21

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#### Automatisierte Medienanalyse

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Still it's gonna get started so the unlikely I did what a point at 1 thing was pretty most people did the math with 2 then again urge if I recognize the former for potential energy and identify potential vs. kinetic energies 1 thing that highlight on remember
The force of frightened times since is called various things in the internal energy or energy dissipated sometimes certain boats and people only refer to it as a work which strictly speaking is incorrect but it's not a potential energy as not a potential energy because it is energy that will never go back into kinetic energy so that 1 way to think of this Potential energies are energies that when you gain potential energy at some point later to be turned back into kinetic energy or to another potential energy that's why it's That enters the potential to move Internal energy energy from friction is just basically trying to see that We did the example their hands together so that the restriction Pritchard is taking either pretend kinetic energy or both Turn into Dissipated or internal energy or something you never knew yet so that's why not a potential so that was With that 1 the other 1 I wonder highlight The other concept because the question asked with single piece of information is sufficient to calculate the height of the job and the forced to leave the ground is not sufficient Right before wires You don't either how long or how far that forces acting but distances acted over how long it's acting for To determine either the acceleration of the war or something else the magnitude of force itself is not enough to tell you how high job what matters is how long that force acts over how much time and that was why we had to introduce work Workers Force times this place and there was a whole thing together the told you about the energy you gain on what you know the speech right will see that you can compare that you're and G 8 3 0 the masses what happened is greater than Jyaistha masses cancel out so you're mass does not comment on why you got All the guns and speed At Questions on that The final thing from the quit
Or some other general comments and I'd as well
Let you all There's a lot of you in the same boat at this point in the court's authority figure that we learn a personal implant keeping track of all things we learned still having the struggle deciding language and I could have put a lot of these quotes on and That is 1 of the reasons when I teach the course courses you noticed I trying use 10 week for a little bit of a review and why you have example blasted and we beleaguered artist so that by the time we that final on Wednesday you get that little actually had time to come up with this altogether hopefully that'll help but I really really like this 1 because I could have said it better but again highlighted again I don't really understand what is going on in class until I go back wants the podcast again that perfect you eat it very very hard in a 50 minutes is lecture The understand everything I said that the best you can do this experience kind let it wash over you do your best but between what's in the pot doing the problem going to discuss instead coming office hours going to the tutorial talking to your friends say what happened you know what what would you get that lasted 2 minutes that's overcome together you this is not a class survive in just like coming enlisting the lecture And hoping you could do it on my said at the beginning may be applied and believe me now you do arriving on the crypt cell Their job any questions there so where we going to do today But were kind of going to reproach energy conservation and 3 stages so today I'm going to hold on to what I consider to be simple energy crop problem examples and tell you I think there's simple to discussing you do the hardest of the simple so you are doing much more than what we did today just kind of at the next light level and Friday in lecture I will add a new kind of what I think of as the hottest energy problems then next week we going to collisions but the big thing that you have to just keep in mind now as soon as you recognize that energy might be relevant to the problem you want to start keeping track of what's going on at a great way to do that as the table because our all goal is a Oregon a year's work causes a change in energy and if
Work 0 the change in energy will be 0 And the change in energy is final minus initial so what we need Now is the initial and the final energy and in this class there only for energies we will deal with kinetic energy potential energy dealer gravity potential energy spraying an energy dissipated For what you might call that Internal energy that's from friction and you add them all up you had been total energy initial You can do that Any work in the problem and that of equal the energy final so this is why I say at some level energy problems are the easiest in this class The concept of physically what is potential energy is very hard But to use it If you just believe in it is very easy and is really has a point where I take this as the starting point is to recognize that if you think energy being used thirst for energy Jack role apply he initial plus work was EU final you will get 1 equation it will have 1 or 2 unknowns has 1 unknown your done sold for it If it has to figure out what else you need to do defined what that's the processor in a practice after practicing enough you'll start to get a better understanding of what these for energies are an outright help you with that but this is a very mechanical part of the course is very much work through it now Let's review re-equip with what those for energies are right kinetic energy any moving object has it But how Editors one-half and squared that's pretty easy potential energy do gravity only occurs if you have a system with the earth class and object each object will have its own potential energy is it with the Earth you need to select a point where the height is 0 and then the potential energy of gravity is given by G 8 now in all of these problems alternately the only thing that ever matters It is the change in energy because notice we always have an initial and final and the Fundamental formula As for the change in energy but by picking up point rates equal 0 we can use of formula For the initial and the final energy so that works potential energy doodle spraying is whenever you have a spring don't have a spring you don't have that now sometimes your brain has erupted stretches of the problems as acts like a spring some years as a mattress that you're sitting on top of the problems acts like a spring just rating is above a border of that stretches acts like a spring and they will have Always give you a spring constant Check but The potential energy of the spraying as 1 have JX squared using equilibrium as 0 So you have to know where the equilibrium position was Rania's and said people 0 again this is because The change of would join spring as 1 after X final squared minus 1 half but for kayaks initial square And the final 1 It was our internal energy this It is always 0 initially I mean you set it not to to be 0 because the changes all that matters to you said Some arbitrary number things still work out but The easiest thing matters is the change is 0 initially and the final energy dissipated as the force of friction times the distance to move so it only exists friction and this case kinetic friction is in your system so I would recommend keeping this and this is on that bridge for acres with you at all times during all over the next week or 2 and make sure This makes perfect sense to look And you've got all of that Speaker Any questions on our for energy Yes I've got a few or at For not So will force is negative yes that matters that do the forces are possibly light potential energy is not negative 1 half its work the potential energy it 1 has carrots where There is no might decide your back a lot more work done by spraying has a mind side of the force has a mind but the potential energy is the opposite of the works so it doesn't There's not a potential I this is up more I mean the name as well as relevant all you really need to know that you got for energies where there word engineer 1 after its threat force tidy whether you call it a potential Or not is an important concept that doesn't come up much in solving the problem but the real reason is exactly It never energy goods around that you can use to generate 1 of these others it's always showing up only in the final answer as in your objects as he or vibrations or stuff great and so what merchandise is Any other initial energies potential energy kinetic energy some of that always get used up by in the fortune in the final and you'll see that we do the problems you never get it back out But questions But There but Final piece of his remember isn't an urgent initial
There was a very good question it up Let's try not to oppose the young and on to the next quicker questionnaire that see what we can do so outlets of Rogers Serena pens and final angle is greater than the initial angle a message situation which is the final angles greater than initial you must removing out direction because subtracted to process the negative You can never have a final angle bigger than the initial because it violates energy conservation or there must be some initial speed or none of the above Most people got it right there must be some initial speed and left for dead in time an your way If I'm dealing with Bears Braboy 8 Noticed what was Speed in this case in energy is always square right so let's suppose we finally 0 then what this tells me Right is a H final was greater than its initial there must have been some initial speed that had to be positive notice that missed Phase right final speed is A rout visit case where But this job Can't had been bigger than H final because I would be telling me I'm at the square root of a negative number For By For us Yes I'm emerges with no other forces that I should include request yet there were other ways to do it Like outside where where they've been a spring in the problems other the things like that But in general when I want to get at least square can never be less than 0 you get there was less than 0 Eva the question is asking you could this happen with syringe for you made a mistake so Those are the things you wanna watch for How Betty other questions on that So let's look at the front of the next is a long a worry
Our Jagr Let's Ceballos I Wannamaker looked a little Today Jagr So rail right supply 1 asked why I joined start my roller-coaster so I just make it through the local real quick with the review you got 5 minutes and the clicker now 5 minutes 3 seconds and the quicker question What is the condition of the ball the Jazz make it through the lawyer It is not what they did it is not the velocity of 0 of the velocity 0 we fall long before we get here we fall somewhere over here you're just make road when you just lose contact and you just lose contact with the normal forces 0 no way way way
While you were still got like 3 minutes here that you What we have to did we won a figure out what's going on in this problem Right the question was how why I do we have to start to just make it through none
We need velocity here Because we Hey these where over are accelerates velocities in 1 hand and be square so we have is that the start above year show that we could make it Starkey
Then He said Would be a velocity of 0 they're right
Because It 1 have and square players NGA business they might not as fell off here
Are so this is a clear evidence that velocity was 0 If not recognition from the top of the normal course being 0 there's a problem that will be a bonus parliament discusses so that otherwise and think about that
Erder
Schusswaffe
Kaltumformen
Puma <Panzer>
Drehen
Masse <Physik>
Spektralbande
Längenmessung
Bikristall
Antiteilchen
Druckkraft
Computeranimation
Eisendraht
Lot <Bauwesen>
Innere Reibung
Boot
Scheinbare Helligkeit
LEAR <Physik>
Direkte Messung
Steckkarte
Drosselklappe
Potentiometer
Licht
Energieeinsparung
Postkutsche
Energieniveau
Rauschzahl
Impulsübertragung
Gleiskette
Minute
Gleiskette
Computeranimation
Woche
Schiffsklassifikation
Zelle <Mikroelektronik>
Boot
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Mittwoch
Stunde
Erder
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Kraftfahrzeughandwerk
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Filzherstellung
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Satz <Drucktechnik>
Computeranimation
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CPA
LIN-Bus
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Rollsteig
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Gleiskette
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Motor
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Römischer Kalender
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Frequenzumrichter
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Hohlzylinder
Anstellwinkel
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Auslenkung
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Teilchen
Lautsprecher
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Minute
Druckkraft
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Heilbronn-Maschinenbau GmbH
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Ersatzteil
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Messung
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Feldeffekttransistor
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Kraft-Wärme-Kopplung
Seil
Proof <Graphische Technik>
Energieeinsparung
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Übungsmunition
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Werkzeug
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Dreidimensionale Integration
Jahr
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Feldeffekttransistor
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Textilfaser
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Zylinderblock
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Passfeder
Seil
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Spritzen
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Spiel <Technik>
Innere Reibung
Kaltumformen
Rollsteig
Front <Meteorologie>
Elektronen-Energieverlustspektroskopie
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Energieeinsparung
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Übungsmunition
Reif
Gummifeder
Steckdose
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Römischer Kalender
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A6M Zero-Sen
Gummifeder
Zylinderblock
Anstellwinkel
Initiator <Steuerungstechnik>
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Mai
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Stromschiene
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Schaltelement
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Beschleunigung
Minute
Computeranimation
DVD-Player
Jahr
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Kraft-Wärme-Kopplung
Fahrgeschwindigkeit
Vorlesung/Konferenz

 Titel Basic Physics Lecture 21 Teil 21 Anzahl der Teile 26 Autor Dennin, Michael Lizenz CC-Namensnennung - Weitergabe unter gleichen Bedingungen 3.0 Unported:Sie dürfen das Werk bzw. den Inhalt zu jedem legalen und nicht-kommerziellen Zweck nutzen, verändern und in unveränderter oder veränderter Form vervielfältigen, verbreiten und öffentlich zugänglich machen, sofern Sie den Namen des Autors/Rechteinhabers in der von ihm festgelegten Weise nennen und das Werk bzw. diesen Inhalt auch in veränderter Form nur unter den Bedingungen dieser Lizenz weitergeben. DOI 10.5446/12932 Herausgeber University of California Irvine (UCI) Erscheinungsjahr 2013 Sprache Englisch

 Fachgebiet Physik