AV Geeks 16mm Lunch 8-28-2023

foreign thank you foreign you know foreign [Music] oh previous you don't need internet me is foreign [Music] foreign foreign foreign [Applause] myself come to alcohol is not exist Ence block Edition [Applause] [Music] [Music] foreign usually um [Music] all right anyways [Music] foreign and that's not completely oh yeah [Applause] okay everything [Music] is foreign Chuck yeah foreign Alabama foreign assistant Carolina I guess because he's a green sit on me they need it so Charles [Music] is [Music] foreign [Music] [Music] said you should send it back home now [Music] the show carefully to the person continue [Applause] [Music] laughs [Music] laughs [Music] bonjour um e skip Alzheimer that's yeah I don't even know if I got that right I took two years of French in high school and because it was the only foreign language at my high school offered and went in one ear and out the other so yeah so that's part of a series toot Le Bond uh laurentry I think which I don't know what that stands for I'll look it up real quick it's uh the end of the summer holidays going back to school work renewing memberships little things that begin at the beginning of the Academic Year that's what that is so yeah and we showed that on our little film scanner well it's not little it's big um so anyways we watch old 16 millimeter films and sometimes they are in English most of the time they're in English and occasionally they dip into another language of which we team to have uh several that are part of French foreign language uh training films let's learn about forces enjoy foreign [Music] a tug of war is a simple way to demonstrate a number of forces acting at a point the forces are acting along the rope in a straight line we can use this knot to represent a point at which the forces are acting some of the boys may be pulling harder than the others to find the magnitude of the force being exerted by this boy we could measure it with a scale 100 pounds in a similar way we could measure the force exerted by each boy these three boys are exerting a total force of 320 pounds we know that the force exerted on the other side is equal in magnitude but opposite in direction we can represent these forces graphically using arrowheads to show their directions to show the magnitudes of the forces we first select a unit distance such as this representing a magnitude of 25 pounds then the length of each arrow is drawn to this scale to represent the individual magnitudes we can represent the sums of the forces acting in each Direction with single arrows drawn to the same scale since these forces produce the same result as the individual forces acting together they are called resultants in this case the resultant exactly balance each other we say that they are in equilibrium one of the resultants may be called the equilibrant of the other let's see what happens when one boy pulling with a force of 100 pounds let's go of the Rope the Rope accelerates to the right we can show why graphically we show the disruption of equilibrium by subtracting 100 pounds from the force on the left the remaining magnitude is 220 pounds this results in unbalanced forces to find the resultant of these forces we subtract the magnitude of one force from the other the resultant a force of 100 pounds is a single unbalanced force problems of this type involve many forces acting in a straight line in this example forces are acting at an angle the forces are being exerted by the tow cars pulling the ship let's see how we can determine the resultant force in this case the force acting to pull the ship forward we'll set up the problem with this model ship to show the magnitudes of the forces used the cables are connected to spring scales calibrated in units these may be English or metric units since the method will be the same this Force has a magnitude of 29 units which we can represent by measuring to some convenient scale a distance of 29 units an arrowhead shows the direction of the force the other Force has a magnitude of 29 units also another arrow 29 units in length represents this Force how can we find the resultant of these two forces one way is to use another spring scale to measure the single force needed to balance the two forces they're equilibrant its magnitude is 50 units next we simply draw an arrow 50 units long in the opposite direction this represents our resultant Force notice that the magnitude of this resultant Force 50 units is not quite equal to the sum 58 units of the component forces we can show the relationship between these forces by connecting the tips of the arrows this forms a parallelogram a parallelogram can be drawn for any two forces acting at any angle in such problems we can always obtain the resultant by measuring this diagonal of the parallelogram let's see how we can use such a parallelogram of forces to solve problems this airplane moves because of two forces acting at an angle the forward force of the engine and the sight word force of the Wind again we'll set up the problem with a model to find the resultant suppose the forward force is eight units and the sideward force is six units as before the arrows determine a parallelogram which in this case is a rectangle the diagonal could be measured to find the resultant Force but this time let's find it mathematically the diagonal is the hypotenuse of two identical right triangles using either of these triangles we can apply the Pythagorean theorem to find the hypotenuse or resultant the resultant equals the square root of eight units squared plus six units squared adding 64 and 36 gives 100 the square root of 100 is 10 units this is the magnitude of the resultant Force the resultant Arrow also gives the direction of the plane's flight using this model of a crane we can show how we can find components when the resultant is known suppose we know that there is a resultant Force along the boom of 12 units from the tip of this Arrow we construct lines parallel to the cables to make our parallelogram of forces to find the components we measure these arrows to scale the component of the tie cable is eight units the component of the weight is six units so we have found the components when the resultant force is known now let's consider a purely abstract problem involving more than two forces acting at a point to find the resultant of many forces we simply use the same method as before applying it to two of the forces at a time first we find the resultant of these two forces this resultant we know can be substituted for its components this force can then be used with the remaining Force to form another parallelogram the resultant determined from this parallelogram is the final resultant of all the forces it will produce the same effect as the three forces with which we started another useful method for finding the resultant of many forces is by graphing using X and Y axes the origin of the axes is made to coincide with the point where the forces act using parallelograms each force is resolved into its components along the X and Y axes this process is continued resolving each Force into its X and Y components until all the forces are resolved into their components along the axes along each axis the forces are acting in a straight line so along the x-axis we simply use addition as with the tug of war to find the resultant along the y-axis we find the resultant in the same way this gives us two forces acting at right angles these forces we know can easily be composed into a single resultant Force this force produces the same effect as the many original forces no matter how many forces we have whether the forces act at an angle or in a straight line the methods we have learned are used in solving all problems involving forces acting at a point please exciting tug of war physics Vector math we love it here at AV Geeks uh I I should say thanks so much for the donations during a toot Le Bond I believe uh Jeremy donated um thank you for that that's just encouraging me um all right so here's another film by our good friends at Coronet because we've been actively scanning their films uh this is fire and oxidation enjoy [Music] thank you when a match Burns energy is released in the form of light and heat [Music] cover something Burns producing light and heat we call the process combustion to learn about combustion let's begin with what was known about fire in the 18th century in this way we can learn the nature of combustion and also something of the scientific methods used in gaining this knowledge a common method of starting a fire at this time was to strike Flint against Steel producing hot Sparks the hot Sparks were directed into a Tinderbox containing charred linen and wood shavings materials known to be easily ignited blowing air on the smoldering Tinder helped get the fire started so air was thought to be one of the requirements for combustion at the time it was thought that there were three requirements for combustion air certain materials that would burn and heat to ignite the materials but it wasn't known why these things were required a scientific explanation of combustion resulted from the discoveries of Antoine Lavoisier a French scientist of the late 18th century using this candle we can illustrate one of the things Lavoisier noticed early in his investigations watch what happens when we place a large jar over the candle in the enclosed space the flame slowly goes out apparently something happens to the air inside the container which prevents further burning to find out what happens to the air when something Burns Lavoisier devised an experiment similar to this one the weights exactly balance the total weight of the candle and a tube containing sodium hydroxide this compound absorbs the gases released from a candle when it is lighted as the candle burns notice that the side of the balance holding the candle gets heavier and moves down where could this added weight come from from the air recent Lavoisier he concluded after performing a number of experiments that when a material Burns it combines with some part of the air while Lavoisier was conducting his experiments Joseph Priestly an English scientist discovered a new gas that would also support combustion one day in an experiment similar to this one he heated a compound called the Red Ash of Mercury as the ash was heated he found that it changed into liquid mercury and released a colorless gas we are collecting the gas in a bottle the bottle has been filled with water and inverted in the tank as the bubbles rise the gas slowly displaces the water in the bottle when the gas has completely filled the bottle we can test it as Priestly did he found that if a piece of wood is ignited in the air and then blown out it continues to Glow but when this glowing splint is plunged into the gas it bursts into Flame this gas discovered by Priestly was later proven by Lavoisier to be the component of air which supports combustion oxygen was the name given to this gas by Lavoisier Lavoisier proved that it is not air that is required for combustion it is oxygen in the air for a material to burn it must combine chemically with oxygen this helps explain why only certain materials will burn wood for example Burns because materials in it combine chemically with oxygen oxidation is the term used to describe this process as a material combines with oxygen it is said to be oxidized all fuels oxidize rapidly coal oxidizes rapidly the kerosene in this lattern oxidizes rapidly and so does the natural gas coming from the barrel of this Bunsen burner fuels oxidize because all of them contain elements that combine with oxygen carbon is one of these elements this charcoal briquette is almost pure carbon as carbon Burns it combines with oxygen to release the gas carbon dioxide that is an oxide of carbon the word oxide is used to describe the compound formed when an element combines with oxygen most fuels contain another element hydrogen hydrogen gas burns with an almost invisible Flame as it burns it combines with oxygen to form an oxide of hydrogen or water as it is commonly called we can see Tiny droplets of water forming on the sides of the beaker another element that combines with oxygen is sulfur as sulfur burns the gas sulfur dioxide is formed the heat released during this oxidation causes the sulfur to melt even a metal such as this magnesium can be made to burn magnesium also combines with oxygen understanding the process of oxidation helps us understand why only certain materials burn let's investigate now the third requirement for combustion Heat why must heat be added to start a fire we can find out why by examining this steel wool if we look at the strands of metal closely we can see rust forming rust is iron oxide it forms when iron combines with oxygen very slowly in this case the oxidation reaction releases very little heat and no light so there is no combustion to have combustion oxidation must occur much faster the process of oxidation like any other chemical process may be made to occur faster by adding heat at a temperature of about 2200 degrees Fahrenheit both light and heat are released from the iron as combustion begins the temperature at which a substance Burns is called the kindling temperature or ignition point different materials have different ignition points yellow phosphorus requires a temperature of only 86 degrees before combustion begins giving off heat and light kerosene must be heated to about 490 degrees before combustion begins hard coal must reach a temperature of over 900 Degrees for combustion we have seen that the three requirements for combustion oxygen certain materials and heat are related to one another by the chemical process of oxidation we can extend our understanding of this process by investigating other applications how is the principle of oxidation involved in putting out a fire with a carbon dioxide type fire extinguisher how does pure oxygen mixed with acetylene gas help to create a flame of extremely high temperature how does the rate of combustion of the fuel used in a car engine compare with the rate of combustion of fuel used in a jet engine you could answer questions such as these if you have a clear understanding of combustion and oxidation [Music] so great the uh you know chemistry films there's a lot of footage of beakers and hands with matches or you know settling torches or whatever uh I I like that I like that better than Talking Heads uh or someone who's talking in front of like a Blackboard or I like the disembodied hand coming in and flexing with something and then there's something that happens reaction wise and we have a lot of that footage there's I would say almost hundreds of hours of footage from the Coronet collection that we've been scanning of just kind of raw outtakes of hands with matches coming in um let's see so again I have another film on the film scanner uh I am striving to put to do more films on the film scanner in a show uh just to kind of get more stuff and what I do is I go back to the shelves where the films are and I say like have we seen this one like so this is one that I haven't seen this one was in the basement we've been slowly cleaning out the basement to try to do some renovation work and this was down there and I haven't I don't think I've seen it but this is safety for the new employee fingers crossed there was a song that's what I'm hoping I have not seen this so let's let's hope for a song all right enjoy foreign [Music] we can't stress it enough make safety a part of your work habits protect those around you protect your health your life and your job be safe or you'll be sorry hey handsome what are you going to do for your next ACT fall in an open trench those safety glasses go where your eyes are I've heard of keeping your eyes on the job but I've never heard of keeping your eyes in your pocket you can't see me the name's safety you can't see safety but if you do as I say we could always be together and have a very enjoyable time now let's start with those safety glasses okay I know when I'm not wanted maybe you'd like to meet my roommate instead she's called accident now you can see her accidents very colorful bright Shades of Black and Blue with some red sometimes lots of red accidents bloody colorful and you can feel accident you can feel her until it hurts oh and something else when you go out with accident it's a very expensive date one thing with accident can cost you several days pay maybe a whole month or more maybe your job accident even costs you before your first date your boss might see that you're on the way to accident and penalize you for an unsafe act or a violation of safety rules you've made a wise choice honey and I'll stick beside you but first you should know what I like oh it's not much just a few things that keep me happy and keep you safe like those glasses I like men who wear safety glasses wear them whenever you're on the job that wasn't made by some Modern artist a flying chip shattered them the wearer got a broken nose and a new pair of safety glasses if he kept his glasses in his pocket he wouldn't need a new pair today but he would need a new pair of eyes every day somebody's vision is saved by safety glasses oh I notice you're married think you could take off your ring while we're together I know you love your wife but I wouldn't want your love to come between you and your finger the ring that binds Your Love also can bind you to a piece of equipment when that happens you'll probably lose the ring and a part of your hand it's better to leave the ring behind than part of your hand your wife will understand every time she counts your fingers nice pair of shoes Safety Shoes reinforced toes plus a metatarsal guard wear them every day to work they'll keep you from being shocked when you count your feet and toes now finish tying your laces we're going for a walk nice trick but it could cost you your brains tighten that webbing so the hat fits snugly and comfortably a properly fitted hard hat will do its job of protecting your brains test the fit but you've also got to use your brains to keep your brains don't temptate by walking under overhanging loads that hat will turn into a Halo if a ton of Steel drops on it walk around danger areas whenever possible nice isn't it I mean the way she picks up that box you're a man you don't pick up things that way do you well you'd better start notice how she bends her legs and lets them do that heavy work The Strain isn't absorbed by the stomach muscles I'm glad to see you're so interested it'll keep you from getting a hernia now let's take a break outside I think your eyes need a rest congratulations you just covered the next half dozen safety lessons never walk or stand between or against piles of material and always walk or stand in a way that lets you react and dart quickly from trouble you almost didn't make it because you were off balance and smoking it'll kill you gradually but if you do it near inflammables it'll kill you a lot faster no smoking near oil or gases if you must smoke only do it in the prescribed smoking areas ask your supervisor where these are pick it up your sloppy housekeeping is someone else's date with accident and this doesn't only mean trash improperly placed equipment and parts also can waylay a neighbor and you nothing should stick out Beyond those yellow lines on the floor a person passing by could get clipped or slip on something you left lying about and that someone could very well be you see that a welding flash actually can burn your eyes quite painful a welder wear specially tinted glasses but you don't so don't stare at the flesh you weren't watching where you were going now let's see the culprit someone carelessly didn't lower the forks all the way to the ground but you can correct this see this lever it'll work in the downward position even when the engine's off before lowering make sure nobody is standing in front now lower it good someone was careless with his tools poor housekeeping but wait this is Double Trouble our careless friend has planted the seed of trouble with a mushroom oh this isn't the kind of mushroom you'll find on a pizza but it is the kind of mushroom that can be taken internally and when it goes in it goes in the hard way see this lip it should have been ground down when it was hammered into this condition the next time this tool head is struck any portion of the lip can fly off just like grenade shrapnel once that head is ground off it'll be safe again here's another beauty that can be a real Beast if you're not careful a portable grinder can give you the quickest manicure in the world as a matter of fact before you know it it can manicure your nails all the way down to your wrist here is the Menace when that portable grinder suddenly hits an edge or an Abrupt change in the plane it can Lurch out of control like a drunken sailor in high gear anything's fair game when that happens it can do a nasty job on your hands thighs stomach and legs pay attention and be extra careful when you use this baby she can be mean those work gloves are a safety Shield but not around moving parts or equipment like the sander any rotating device can hook onto gloves especially this Gauntlet type and pull your whole hand and arm into the swirling apparatus and when you have them on keep them on when you're handling or carrying steel beams wooden planks and other materials and of course always use gloves when you're handling wire rope or slings never leave a power tool hooked up when you're not using it and never pull out the cord by pulling on the cord use the plug well what's done is done and that goes for this plug it's done never use a plug without a ground see where the ground was broken off a plug better have three prongs before you put it in the wall if you get a cord without a ground prong don't use it now we're ready for business this sander has a ground but that's no guarantee that you still won't be in for a surprise when you go to turn it on never trust any electrical tool any one of them can be harboring a short so before you turn the tool on turn around make sure you have some clearance in case you have to quickly throw away the tool sometimes your safety glasses won't be enough when you know that you'll be doing something that causes debris to fly around replace your safety glasses with more protective goggles oops see what I mean about housekeeping well what do you know another double header in the screw-up Department this wrench not only doesn't belong on the ground it doesn't even belong on the job adjustable wrenches don't give the sure Positive Locking that a box wrench does don't wait for your bruised Knuckles to tell you that you've made a terrible mistake you've got good eyesight when it comes to girls so use that same Talent when it comes to fire extinguishers always notice where the closest fire extinguisher is to your job site you'll never know when you'll need it some fire extinguishers can't be used on electrical fires and some kinds can be used on all types of fires find out which is which and remember after you've put out the fire with an extinguisher don't put the fire extinguisher back it has to be refilled ask your supervisor where to bring it for refilling most tags tell you what to do a tag on a switch box like this one tells you what not to do Machinery that's being worked on has its switch box locked and tagged to prevent someone from using it when it isn't operable only the man who affixes the tag is allowed to remove it halt how deep is that puddle of course you don't know and you won't know until you step in it you might just get your shoes wet or you might discover that it's deep enough to really take a bath in a little water never hurt anyone but if it's deep enough it could turn your ankle or trip you into falling and really getting hurt walk around puddles water holes and especially beware of floor openings those are freestanding gas cylinders that's a safety hazard they must be tied to a stationary object like that bench leg now a few more pointers on gas cylinders those caps when the pressure regulator is taken off they must always be kept never store them on their sides even if they're empty make sure the valve is closed when the cylinder is not in use even if the cylinder is empty never lift the cylinder by its valve or cap never drop them or handle them roughly they have a mean way of getting even a ladder gets you up in the world but it can also be your downfall inspect every ladder before you use it notice breaks splinters loose rungs when placing the ladder it should be away from the building a distance equal to one-fourth of its extended height if the ladder is 24 feet tall for instance the base must be six feet away from where it's leaning This Is The Moment of Truth test for the latter put every ladder through this test before you use it sure you inspected it but hidden faults can make the latter unsafe now stand right in the middle if it doesn't crack or break the ladder will bear your weight and is safe with scaffolding the Moment of Truth test is a little more demanding because it must bear more Force when it's in place get in the middle and jump up a few times never climb a ladder unless it's secured at the top hey handsome I said never climb a ladder that's unsecured so how do you get to the top to secure it ask your buddy he holds the ladder while you make the first climb and tie it off and when you come down don't leave any tools parts or equipment on the ladder or scaffolding that goes especially for step ladders when someone moves the ladder that left behind piece can topple and clobber him or you okay handsome you're on your own now and please remember I can get this it's very frustrating let me see if I can fix this in the meantime you know what's coming next [Music] hey get down from there now [Music] hey turn it off what if it bumps that control by accident you'd be mince meat by now what have I told you you don't work on equipment when the engine's running well I told him not to touch anything all right I guess I wasn't thinking y'all weren't thinking you mean you'll work on engines and machinery and not think of your own personal safety hair shake hands with Danger ous [Music] I used to laugh at safety now they call me three finger Joe [Music] I was young and feisty never did things by the book just let me get my toolbox and I'll take myself a look I climbed up on a Dozier with my mechanic's Pride I said you can keep it running friend while I poke around inside [Music] three finger although I learned a lesson I forgot it soon enough the Nixon Burns and scratches showed the young ones I was tough till another morning I was grinding on some steel my other hand got chaos fed my skin into the wheel shake hands with danger step right up and say hello grinding wheels and metal are what's amazing I've seen mechanics burning I've seen them take a fall just to save themselves a minute I've seen them lose it all I've watched them caught in trouble seeing them take a chance and lose they get careless for a moment and spend a lifetime with the Blues thank you [Music] foreign [Music] [Applause] [Music] smile s were dangerous [Music] [Music] [Music] inside [Music] [Music] shake hands with danger and some friends I Used to Know compared to them I'm lucky to be just a three-finger Joe [Music] [Laughter] High It Off and when you come down don't leave any tools parts or equipment on the ladder or scaffolding that goes especially for step ladders when someone moves the ladder that left behind piece can topple and clobber him or you okay handsome you're on your own now and please remember safety is always available there's no need to have a date with accident [Music] thank you it's just she said and please remember and I was like and then the film Lost tension and I was like crap I want to know what what that is what's a parting shot and of course it wasn't worth it um wow that film was fascinating uh and it actually covers a lot of ground that the uh the full version of shake hands with danger does as far as different aspects of work and smoking and all that stuff so uh but no I mean it was all flirty but no song which is unfortunate I wish I'll keep looking I'll keep looking for other films that have uh safety songs in them especially ones made for people that work on construction sites but hopefully you enjoyed it nonetheless and um thanks for tuning in thanks so much for uh donating to the cause that's one way to support us is use the super thanks button or go to patreon.com or KO Dash fi.com Geeks those are ways to send us some cash that will spend on coffee or we will spend on uh headphones we needed headphones so that's what we need we spend money on um yeah so join us tomorrow and if you you don't want to send us cash then the easiest thing you can do is just hit the thumbs up button or the like button uh you can also subscribe and watch other things on our channel uh because there's advertising on there and we get pennies every time your eyeballs hit those other films um and tell your friends but thank you so much for tuning in today Monday we'll be back again tomorrow uh farewell bye bye