Good video, but the statement that "simple machines reduce the amount of energy that is required for a task" is incorrect. The energy to do a task remains constant; a simple machine reduces the force required (or power required) to do something, but at a cost of applying that force over a longer distance. The force applied times the distance over which it is applied is the change in energy, which remains constant. In fact, the force x distance rule for calculating torque (as shown in the video) relies precisely on the conservation of energy.
@@minecraftbasics1366 in physics work is defined as Force(pushing or pulling an object) multiplied by Distance = Work. Basically what he is saying is you are sacrificing the amount of force you use for a longer distance. It just makes the work easier because you are using less force, but over a greater distance, so you are still consuming the same amount of energy but it is easier because you are using less force.
It also makes it seem like the work is the force x lever arm distance, when really the work done is the force times distance the edge of the teeter totter goes down.
I will use the example of the girl and the friend who weighs twice as much as her. In order to lift her friend she would have to sit twice as far from him in order to lift him, right? What he didn't mention is that her friend would only be lifted half the distance that she traveled. You can see it in the animation but he didn't explain that part very well. So in order to lift the friend say 1 meter she would need to travel 2 meters. And that is the trade off. So with the equation of force 1 * distance 1 = force 2 * distance 2 we have 150 lb * 2 meters = 300 lb * 1 meter. that represents the length of the lever, so if she travels downward say 4 meters on her end then the friend would only be moved upward 2 meters on his. The energy in the system is the same since energy cannot be destroyed nor created, only transferred from one form to another. Otherwise the lever would somehow be creating energy, which is isn't. So thats why what he said is incorrect. Hope that made sense. :)
I'm watching this video on my iPad on a laptop tray and didn't even realise that I'm balancing my iPad and beer at the same time using lever! Great video👍
Easy said than done! Yakov Perelman in his famous book " Physics for Entertainment", discusses the idea of Archimedes trying to lift Earth; he would be using a lever with a longer arm 10^23 times longer than the shorter one, and to lift Earth by at least 1 cm, Archimedes must follow a hug arc in space about 10^18 Km. This is a colossal distance which Archimedes would have to push the lever to lift Earth just by 1 cm. Presuming that Archimedes could have lifted 60 Kg, 1m/s, then to lift Earth (5.97 * 10^24 Kg), he would need 10^21 Seconds = 31.7 Trillion years (Age of visible Universe =13.7 Billion years) !!
Also, Archimedes would have to travel/push down the arm for millions of light years to lift the Earth by 1centimeter. This is considering that the fulcrum is at the moon-distance as mentioned. Considering that Archimedes used a Rocket-Ship and pushed down the arm at close to light speed, he still would have to live for zillions of years to keep pushing. But time varies with gravity and Archimedes at the end of the lever must be in a Supervoid part of the Universe; so that zillions of years on LocalCluster-Galaxy-Sun-bound Earth = a human lifetime in the Supervoid. On a personal note: The other day I was standing on the short end of a long lever and a bacterial cell jumped on top of the other end lifting me up. True story.
Me pareció un video muy interesante, tres aspectos que desconocía del tema fueron: 1.Toda palanca tiene 3 componentes principales: el brazo de potencia, el brazo de resistencia y el punto de apoyo. 2.Una palanca esta equilibrada cuando el producto de la fuerza de potencia y la longitud del brazo de potencia, es igual al producto de la fuerza de resistencia y la longitud del brazo de resistencia. 3.La palanca facilita el trabajo dispersando su peso en toda la extensión de los brazos de potencia y de resistencia (si una persona pesa dos veces más que tú, tienes que sentarte dos veces más lejos que él del centro para levantarlo).
1. Toda palanca tiene tres componentes principales: I El brazo de potencia II El de resistencia III El punto de apoyo. 2. La palanca esta equilibrada cuando, el producto de la fuerza de potencia y la longitud del brazo de potencia es igual al producto de la fuerza de resistencia y la longitud del brazo de resistencia 3 Para que una persona de 68 kg pueda levantar un bloque de 2,5 toneladas necesitaría estar a 10 metros de distancia del punto de apoyo de nuestra palanca
So I just bought me one of those quadrillion light years long lever, but I still can't move the earth. Do I need gravity below me or something to apply a force?
2:11 - it should say : Torque , measured in Nm , is equal to the force applied over a perpendicular distance. The work done by these forces is acually zero, since the force and the direction are perpendicular.
No, work is correct in this case, although torque would have been acceptable as well. The video is a bit unclear, but what it's trying to say is that when the lever's HORIZONTAL distance increases, you have to push it further in the VERTICAL direction to get the same rotational effect. Since the force applied is vertical (perpendicular to the lever), the total force decreases because the vertical distance it acts over increases.
I always thaught this was a philosophical Buddha type quote, but the beauty of it is both of science and wonder. Very much as two points on a grid make a line, three points make a plane, and so on and son four and five points make four and five demenshonal shape. Our understanding is only limited by the limits of our curiosity.
The amount of energy required to perform a task is always constant. Mechanical machines, such as lever, change the amount of force or displacement while product of the two (energy) is always constant (for ideal machines). This video needs correction at 1:17.
This was so helpful. My tech teacher didn't explain this well and I couldn't understand the homework at all. Now I can do it with some ease. Thank you so much
This is highly valuable (the conservation of energy and subsequently of power) when you have to mount in need ,the spare wheel to your car. Usually you have a telescopic (expandable) wrench that increases the lenght of the lever, let's say twice.Thus you have to apply only half of the force needed to rotate the wheel screws. Work (mechanical energy) equals Force times distance (W=F*d).
3 aspectos que desconocía sobre el tema: 1.- Desconocía el nombre adecuado de las partes de la palanca (brazo de potencia o fuerza, brazo de resistencia y punto de apoyo). 2.- Desconocía la relación e importancia que existe entre el peso y la distancia al punto de apoyo de las máquinas simples para poder mover algo más grande. 3.- Desconocía que el brazo de resistencia lo vamos a llamar al lado que queremos levantar (el objeto pesado y grande) y el brazo de potencia (fuerza) es el lado de nuestro peso o de donde vamos a ejercer la fuerza para levantar ese objeto.
Did he mean torque instead of work? Work is force applied over a displacement where the force vector is parallel to the displacement vector and the units are in joules. Where as, torque is force applied over a radius where the force vector is perpendicular to the "radius vector" and the units are in N*m. I could be missing something, please feel free to correct me if I'm wrong.
Infinity 1 man, im no english speaker so sorry if I make any gramatic error. But in the video they talk about work because we "can" see the movement of the machine as work, even thou torque has a lot more easy way to describe this phenomenom, work can be used as too, as we do the right conversions.
No, work is correct in this case, although torque would have been acceptable as well. The video is a bit unclear, but what it's trying to say is that when the lever's HORIZONTAL distance increases, you have to push it further in the VERTICAL direction to get the same rotational effect. Since the force applied is vertical (perpendicular to the lever), the total force decreases because the vertical distance it acts over increases.
John Dixon While work is an applicable concept in this situation, I think torque actually makes more sense in this context, as the radius * force idea makes it much more understandable to why you must increase your radius in order to make up for a decrease in force, as you must have a net torque of zero to have no angular acceleration.
You are right, I guess. But speaking of see-saws, gravitational force, work done and potential energy is more applicable and convenient. The moment you take it to outerspace, they become meaningless, torque should be used.
1.- Las palancas nos ayudan para facilitarnos el trabajo de levantar objetos pesados, se basa en principios de física. 2.-una palanca se describe por tener dos brazos (potencia y resistencia) y un punto de apoyo, esta palanca produce trabajo cuando el producto emplea una fuerza de potencia mayor a la fuerza de resistencia y los brazos midiendo lo mismo 3.- la relación entre el punto de apoyo, brazos y fuerza del producto, permite que podamos repartir el peso de algun objeto imposible de levantar a lo largo de la palanca y, si esta tiene un brazo de potencia mas grande se aplicará menor fuerza para levantar el brazo de resistencia
The explanation was going well, but it failed in the middle, but I could figure out why a lever works when he mentioned about work! What the lever does is that it allows you to do the same work you would do in lifting the weight, but with a trade-off: you do less force, but the distance you have to keep doing the force increases! So you have to lower the level a lot more to lift the heavy weight a little bit!
Work is force multiplied by distance given that it isn't being done at an angle. If it's being done at an angle, you need the cosine of the angle to calculate the work.
1. el sube y baja es lo que llamamos maquina simple 2.la palanca esta equilibrada cuando el producto de la fuerza y la longitud del brazo de potencia es igual al producto de la fuerza de resistencia y la longitud del brazo de resistencia 3. el trabajo medido en Joules es igual a la fuerza aplicada por la distancia
Me pareció un video muy interesante, tres aspectos que desconocía del tema fueron: 1.Toda palanca tiene 3 componentes principales 2.Una palanca esta equilibrada cuando el producto de la fuerza de potencia y la longitud del brazo de potencia, es igual al producto de la fuerza de resistencia y la longitud del brazo de resistencia. 3.La palanca facilita el trabajo dispersando su peso en toda la extensión de los brazos de potencia y de resistencia.
ÉTAPE 1 Détailler le chocolat en pépites. ÉTAPE 2 Préchauffer le four à 180°C (thermostat 6). Dans un saladier, mettre 75 g de beurre, le sucre, l'oeuf entier, la vanille et mélanger le tout. ÉTAPE 3 Ajouter petit à petit la farine mélangée à la levure, le sel et le chocolat. ÉTAPE 4 Beurrer une plaque allant au four et former les cookies sur la plaque. ÉTAPE 5 Pour former les cookies, utiliser 2 cuillères à soupe et faire des petits tas espacés les uns des autres; ils grandiront à la cuisson. ÉTAPE 6 Enfourner pour 10 minutes de cuisson. J'ajoute mon grain de sel
I am not even kidding, nobody on Earth was telling me why on Earth a simple machine can do this and lift such heavy things with so little force but Ted Ed came to the Rescue
And got it wrong. Sorry though, but they made a HUGE mistake in the explanation. "Basic devices that reduce the amount of energy required for a task" contradicts the energy conservation - the ONE LAW they should have explained correctly.
Wait, but if there is no gravity, how would a lever work? Like If you can't apply weight to the lever, surely it just isn't possible? Please correct me if I'm wrong, because I am very confused myself.
There's literally no gravity out there, so you'd probably need a little more force than your mass can generate, to push down on the lever. Considering that the fulcrum is at the distance of the Moon as mentioned. Taking into account that Archimedes used a rocket ship and pushed the arm down at a speed close to that of light
Erick Karin Ríos Cisneros Alumno UACH facultad de educación física 5° 1.-Las maquinas nos ayudan a realizar trabajos complejos con poca energía o poco esfuerzo 2.-A pesar de ser una herramienta simple, la palanca ha sido muy útil en la historia del humano, y a ayudado en un sin fin de actividades, de tal manera que aun se sigue usando 3.-Los principios matemáticos son los que hacen que el mundo funcionen, me gusto la frase y creo que tiene mucha razón.
Beauty and function, wonders meets science two as one melding together. Both become one as they never separated in first, the attract and repel in the illusion of it all.
Es un video muy interesante y fácil de entender gracias a las ilustraciones y ejemplos tan concretos que dan. Siempre había tenido la inquietud de como los mayas había hecho para levantar y transportar piedras tan pesadas para construir las pirámides y con este video creo que empiezo a entender que estrategias utilizaban. Algunos puntos interesantes que no tenía en mente son: • Arquímedes describió el principio fundamental subyacente a la palanca. Y explico lo siguiente: el trabajo medido en Joules es igual a la fuerza aplicada por la distancia. • Las palancas son un tipo de máquinas simples, las cuales son dispositivos básicos que reducen la cantidad de energía requerida para una tarea, aplicando inteligentemente las leyes básicas de la física. • Las palancas tienen 3 características fundamentales: el brazo de potencia, el de resistencia y el punto de apoyo. Estas facilitan el trabajo dispersando el peso en toda la extensión de los brazos de potencia y resistencia. • Una persona que pesa 68 kilos con una palanca de 3,7 metros de largo podría equilibrar a un auto Smart o con una palanca de 10 metros para levantar un bloque de piedra de 2,5 toneladas, como lo usaron para construir las pirámides. • Los elementos básicos de las palancas y de otras máquinas simples están a nuestro alrededor en varios instrumentos y herramientas que usamos, como otros animales, para aumentar las chances de supervivencia o solo para facilitarnos la vida.
Me: IS THERE AN EARTHQUAKE OR SOMETHING? Parents: N E W S me: WHY IS THERE A BIG SEESAW IN SPACE LIFTING US? me: W H A T💀 parents: 😭💀 *dying of laughter*
지렛대에 숨어있는 강력한 수학에 대하여 알아보는 시간이 되었습니다. 힘의 규모와 받침점과의 거리간에 중요한 상관관계가 있다는 것 이것으로 힘을 손해보고 거리의 이득을 보든가, 힘을 이득보고 거리를 손해보는가 이것이 지렛대의 원리라는것을 배웠습니다. 이것이 너무 멋있는것 같습니다. 정말 재미있는것 같습니다. 좋은 시간이 되었습니다. 감사합니다. b*F=a*W 너무 간단하면서도 모든것을 말해줍니다. 너무 아름답습니다. 물리학도 정말 아름다운것 같습니다.
Would discovering the phenomena of buoyancy have contributed to the development of a builder's level ? Is it true that Archimedes invented the auger ? Why is the weight / ballast oftenly overlooked when cataloging simple machines?
I have an idea for a lifting force machine. Step 1: Get hollowed out cube. Step 2: Securely attach magnet to inner bottom of hollowed out cube. Step 3: Place a lever on inside bottom of cube behind the magnet that's securely attached to inside bottom of cube so that one side of the lever is pointing towards you and hanging over the magnet. Step 4: Attach a vertical bar to the top side of the part of the lever that is not hanging over magnet witch is securely attached to inner bottom of cube. Make sure the bar goes all the way up to the inner top of the cube barley touching it. Step 5: Securely attach a magnet to the side of the lever that is hanging over the magnet that is attached to the inner bottom of cube. Note: Magnets need to be facing each other with attracting poles N,S or S,N Note: The lever is going to have to be really close to the magnet on inner bottom of cube because of how close those magnetic fields need to be to interact. But not so close that magnets can touch. The magnet on top connected to lever is pulling the magnet on inner bottom of cube towards it and since the magnet on inner bottom of cube is connected to cube, this pulling force acts as a lifting force. Now at the same time the magnet on inner bottom of cube is pulling the magnet on top downwards BUT the magnet on top is connected to the lever so any downwards pulling force is being converted mechanically by the lever into upwards lifting force. Now if you know anything about magnets you now that there are magnets powerfull enough to lift far more weight then just there own. So essentialy this divice is exploiting the powerfull pulling force of magnets by mechanicaly transforming its magnetic pulling force into mechanical lifting force through the clever utilization of a lever, and walla stuff can be made to fly. Imagine if the magnets in this experiment where electro magnets so the ammount of electrical current going into them determined the ammount of lifting force that it would have. Now imagine this system being used as an attachment that could be placed under or ontop of vehicles to counter the weight of the vehicle and any cargo its carying. Now imagine if this was done with powerfull permanent magnets and turned sideways and placed in an electric generator and had enough strength to pass through the magnetic fields as it propelled itself forwards with its own magnetic pulling force. Signed Adam McKenzie Anderson Extra Note: If anyone uses my ideas for none profitable means great I hope it helps but if they are used to gain profit in any way I want 25% of anything that comes out of it please. :) My EMail is starfire7654321@yahoo.com
Desconocía por completo que las palancas se componen del brazo de potencia, resistencia y punto de apoyo. Suena muy interesante que las palancas sirven mucho mas de lo que pensamos en nuestra vida cotidiana, ya que son muy útiles. también desconocía quien fue el que lo descubrió , el matemático Arquímedes.
This is phenomenal stuff thank you!! Great education right here. You can teach kids about leverage in finance using this example too. It can help them understand the concept of using leverage as buying power
The moon is not fixed though so it cannot be used as a fulcrum. Also, the lever arm has to be strong enough not to flex, not only would the lever have to be long enough, it would have to have considerable mass and strength. Then you would need gravity to exist where it doesn't exist. Give him that place to stand and he'd, freeze, burn and decompress simultaneously whilst floating away from his precious lever. The earth and the moon are moving at great speed also, so the lever would be a giant club flying around scrubbing the surface of the earth and whacking all sorts of space debris. It'd be thrown off course alright but not by a bloke with no momentum or weight in the void of space, but by other moving items of great mass.
El video es muy interesante y muy claro con sus ejemplificaciones lo cual lo hizo muy entendible, en el cual se dio a conocer con la información varios aspectos que desconocía del tema los cuales son: - La palanca tiene 3 componentes principales: el brazo de la potencia, el de resistencia y el punto de apoyo. - La relacion importante entre fuerza de potencia y resistencia de potencia; es decir, entre las magnitudes de estas fuerzas y sus distancias al punto de apoyo. - Que la palanca esta en equilibrio cuando el producto de la fuerza potencia y la longitud del brazo de potencia es igual al producto de la fuerza de resistencia y la longitud del brazo de resistencia. - leyes basicas de la fisica: El trabajo medido en joules es igual a la fuerza aplicada a la distancia, haciendo que la palanca no se le pueda reducir el trabajo reuerido para levantar algo. - Ademas, con una palanca grande se pueden levantar cosas pesadas.
Will you actually be able to lift the earth? There's literally no gravity out there, so you would probably need a bit more force than your mass can generate, to push down on the lever
me pareció muy interesante, no sabia que: -La palanca se compone de brazo de potencia, resistencia y punto de apoyo. -si la fuerza de potencia es menor a la de resistencia basta con hacer palanca para lograr un punto de equilibrio -la palanca esta equilibrada cuando la fuerza de potencia y la longitud del brazo de potencia es igual al producto de la fuerza de la resistencia.
If we are really talking about the earth in space, for a very small acceleration requirement (i.e. to lift the earth very slowly) you only need a very small force. The faster you wanna make the earth get to a certain speed the more force you need to apply. Since in space there is no gravity, then the force needed is mass of earth x the acceleration. You need to choose the fulcrum, then you can calculate the distance from the fulcrum based on this formula: Your distance from fulcrum = the distance of the earth from the fulcrum * Mass of the earth * acceleration you want to move the earth with / (the force you are applying).
I don't know the context of Archimedes's conjecture, but do you think perhaps he was referring more to Newtonian physics in that the simple act of standing on the earth is "causing" the earth to apply equal/opposite force? To push your body off the earth requires you to push the earth etc etc
You forgot to mention that you'd need a material strong enough to withstand the bending stress that would be generated in the lever. That limits quite heavily the amount of weight you can lift...But anyway, great video!
And Archimedes would only have to wait - assuming that the lever is made of steel - 874.1 quintillion years for the information of his force to get to the Earth and actually move it.
Dang, and here I was thinking we should make that lever to save earth from an asteroid strike, but it will take to long to move, thanks for the info, save me a lot of work for nothing.
if you are in space you would need even longer than what he said because no gravity so to push the lever down you going to have to use your hand to lever it down wich needs to be super light like pushing a ballon since you dont want to push yourself away by accedent idk i just wanted to say this i know this makes no sense but hey just wanted to say it
Wouldn't the wooden lever only be able to transmit energy at the speed of sound so if you applied force to the lever It wouldn't reach the earth for a very very long time. Plus you need to make sure the lever has uniform density
Nice video. One query though, if a person weighs 150lbs (as in your video) and uses a 10m lever, isn't that equivalent to 1500lbs? But, 2.5 tons is 5000lbs. So, how does this person lift the stone block?
