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# Basic Physics Lecture 15

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I think we're gonna get started on the 1st thing I want do is make a quick comment on 1 of the homer problems is the 1st time I received multiple
How do I know there's 0 net force on my rod when I do that The center mass doesn't accelerate anywhere right at the center of mass I told you for something uniform like this the right of the center it never goes anywhere remember when Habre when I hit my friend right when I hit my plan and it went flying up When I hear this And it doesn't go anywhere to spend 0 net But not 0 network and that's because 1 forces acting here But are equal Iraq in factors to forces there's the weight down and the forests from this object of the part Statue and then there's this force here So these 3 courses in canceled a 0 net Force upper down but this 1 R cross and is the only 1 that provides a torch This is our 8 0 0 How I So that would you got For talks Now let's look at some of these in more detail so we're having your familiar was erratic ranch Like 3 of your excellent So this is holding not right now because it's a nice ratchet wrench is earlier I could move it up but it didn't come back down unless they twist but not here Because it moves when directed a dancer got a really nice Teflon ball so there's a uniform torque applied by this With that Overcome to make it rotate and so I could use Masses to generate forces down due to their way of The here And a dozen will write if was to compute the best
The So what we have is this bar here there is of course From the center There's actually because this center has some finite size and those of course over here the there is a port Here as well that's keeping it from rotating now I applied mass down in the center here over distance have The rod and notice the torque is still canceling its not starting to accelerate this is what we would call static equilibrium Now if I hang in the past here that accelerated
But starts to to rotate and what I did Notice that injuries will force any right of course is still the same saying Mass ideas are bigger right
So if I come over a year And I have now of course over just this force I'm now using Al some comparing the Torquay equal to Ella times FW versus the Being held climbs FW and of course T 2 is bigger than T Y and it starts to ban Now this is a case where the idea
But Perpendicular It makes a lot more sense the force Perpendicular because the forces always straight down considerably from weight and now but put up high enough Do you see it doesn't slide down right now that torque is not great enough because I'm an angle You can even think of it as this component of the forest is the only component of rotate or forces now acting over a shorter distance right actor perpendicular distance not before we call this the lever arm as a leverage that you're dead is married to make this work OK so let's go ahead and draw that in our picture
Right so that was playing the Mehsud different places but I can also B up at an angle hang my forced down and now this is effective are perpendicular and my tour about that point is are perpendicular Times at and this is less than the magnitude of art Now of course if I make the 1st beggar It will down so whether that I locked it in place It was literally just that I had a bigger angle eliminate the angle even bigger But The masses will support it Oh I guess not show good thing I moved Our but that 1 is an hour we destroy military duets Let's make it really definite So now I really really short Lever arm faces this long enough And I'll stay up there That's what now but of course
I can do is I can going close and ask forget how many masses support for again is my real a short level on shorter distance and told into Don't At solving 380 And it's supposed to well Turn with 4 Barely not It well turn with 4 members of the project so But there is a combination All 3 Book Total cost exactly where the forces acting the angle between the 4th and not need all 3 of them so This
That is really a great visual for that Any questions on that aspect of it The us So we don't actually Notice the rule is the following it this is our The angle between half an hour is always the angle you get from going less than 180 sees his way to do it because I'm here Right that's rotating it this way If I'm here Which is the negative fade That's rotated the other way I notice that minus sign that gives you the correct answer in your RF signed data right is assigned a negative data is negative the sign a positive data so you will get correctly that its negative now for most calculators but this is the Sabres with renewable most calculators these days but never used to be that smart but I put that angle also get the negative End the show so you do wanna be careful when plugging you're angle values into your calculator you correctly getting the positive and negative and that's why I always recommend checking signed a START 8 SIGN bite Using your right hand rule and not just relying on your calculator for that date because at IRS signed it is really the magnitude of the tort that the safest way to do it now before you decide plus lover laced up 2 minutes Where we going that everything we're going to be doing now for the next 2 days is about a special case of static Equilibrium static Means not moving so velocity 0 equilibrium means not changing so 8 0 0 hours We can't have not equal to 0 and 8 0 that would just be equilibrium Oregon be doing static equilibrium and at the same time no rotation or rotational acceleration Everything's gonna be about Senator Beagle 2 0 on the net and the net For equal to 0 and that's why we needed to be able a calculate for Baffert context which were going to use it soared as did today the examples
Analyzes review friction tents and all of that
Naht
Rotationszustand
Gewicht
Drehen
Masse <Physik>
Parallelschaltung
Gesenkschmieden
Erdefunkstelle
Regelstab
Cocktailparty-Effekt
Energieniveau
Feldeffekttransistor
Computeranimation
Woche
Seitenwagen
Rotationszustand
Forschungssatellit
Spiel <Technik>
Movimento di Studi per l'Architettura
Klangeffekt
Familie <Elementarteilchenphysik>
Homogene Turbulenz
Windrose
Druckkraft
Nivellierlatte
SOHO <Satellit>
Gleichstrom
Innere Reibung
Drosselklappe
Greiffinger
Magnetisches Dipolmoment
Außenbordeinsatz
Konfektionsgröße
Weltall
Cocktailparty-Effekt
Satz <Drucktechnik>
Beschleunigung
Leitungstheorie
Computeranimation
Woche
Schlauchkupplung
Rotationszustand
Sonntag
Montag
Fahrgeschwindigkeit
Multiplizität
GIRL <Weltraumteleskop>
Array
Hydropneumatischer Speicher
Großkampfschiff
Kaltumformen
Elektronisches Bauelement
Längenmessung
Standardzelle
Übungsmunition
Satzspiegel
SOHO <Satellit>
Liner
Jahr
Ringgeflecht
Absolute Datierung
Lineal
Analogsignal
Anstellwinkel
Drosselklappe
Synthesizer
Masse <Physik>
Dienstag
Antiteilchen
Bogenlampe
Steckkarte
Zeitmesser
Teilchen
Wollspinner
Spiegelobjektiv
Walzmaschine
Winter
Zugangsnetz
Brennpunkt <Optik>
Elektronen-Energieverlustspektroskopie
Proof <Graphische Technik>
Rauschzahl
Schiffstechnik
Minute
Telefon
Nivellierlatte
Druckkraft
Thermalisierung
Schiffsklassifikation
Nassdampfturbine
Gleichstrom
Scheinbare Helligkeit
Material
Ersatzteil
Uhr
Mittwoch
Schalter
Holzfaserplatte
Gewicht
Greiffinger
Masse <Physik>
Direkte Messung
Kugelblitz
Energiequelle
Lötlampe
Schraubenschlüssel
Rutsche
Regelstab
Hobel
Antiteilchen
Beschleunigung
Nanometerbereich
Feldeffekttransistor
Computeranimation
Wollspinner
Passat
Negativ <Photographie>
Herbst
Homogene Turbulenz
Kaltumformen
Elektronen-Energieverlustspektroskopie
Längenmessung
Tag
Nahfeldkommunikation
Standardzelle
Proof <Graphische Technik>
Rauschsignal
Rauschzahl
Druckkraft
Spin
Gleichstrom
Edelsteinindustrie
Scheinbare Helligkeit
Jahr
Ersatzteil
Ringgeflecht
Papier
Anstellwinkel
Holzfaserplatte
Thermalisierung
Längenmessung
Konfektionsgröße
Computeranimation
Gewicht
Kaltumformen
Elektronisches Bauelement
Längenmessung
Jahr
Rutsche
Anstellwinkel
Druckkraft
Übungsmunition
Computeranimation
Greiffinger
Drehen
Masse <Physik>
Kombinationskraftwerk
Längenmessung
Energieniveau
Druckkraft
Computeranimation
Kurzschlussstrom
Satzspiegel
Scheinbare Helligkeit
Anstellwinkel
Stunde
Gewicht
Tag
Minute
Übungsmunition
Institut für Raumfahrtsysteme
Computeranimation
Thermalisierung
Rotationszustand
Innere Reibung
Scheinbare Helligkeit
Fahrgeschwindigkeit
Lineal
Absolute Datierung
Anstellwinkel
Mikroskopie
Drosselklappe
Stunde