When a physics teacher knows his stuff !!..



I have here a pendulum I have an object that weighs 15 kilograms and I can lift it up one meter which I have done now that means I've done work MGH is the work I have done believe me I've increased the potential energy of this object 15 times 10 so 150 joules if I let it fall then that will be converted to kinetic energy if I would let it swing from one meter height and you would be there and it would hit you you'd be dead 150 joules is enough to kill you they use these devices to call a wrecker ball they use them to demolish buildings you lift up a very heavy object even heavier than this and then you let it go you swing it thereby converting gravitational potential energy into kinetic energy and that way you can demolish a building you just let it hit and it breaks a building and that's the whole idea of wrecking so you are using then the conversion of gravitational potential energy to kinetic energy now I am such a strong believer of the conservation of mechanical energy that I am willing to put my life on the line if I release that Bob from a certain height then that Bob can never come back to a point where the height is any larger if I release it from this height and it swings then when it reaches here it could not be higher there is a conversion from gravitational potential energy to kinetic energy back to gravitational potential energy and it will come to a stop here and when it swings back it should not be able to reach any higher provided that I do not give this object an initial speed when I stand here I trust the conservation of mechanical energy 400% I may not trust myself I'm going to release this object and I hope I will be able to do it at zero speed so that when it comes back it may touch my chin but it may not crush my chin I want you to be extremely quiet because this is no joke if I don't succeed in giving it zero speed then this will be my last lecture I will close my eyes I don't want to see this – please be very quiet I almost didn't sleep all night three two one zero physics works and I'm still alive

28 thoughts on “When a physics teacher knows his stuff !!..”

  1. Sir mujhe ek question hai aap uska answer de sakte ho to Sampark Karen aap ko 20000000 rupay Milenge 7014418696
    what's aap no. 9783012014

  2. Fantastic class! That's the way that all physics classes should be: the theory and the practice. Also a remarkable teacher

  3. I have a question…..

    Can you conserve mechanical energy when there are non conservative forces….in this case there is air resistance…..

    So the initial potential energy losses by the body is not fully converted into kinetic energy as some of it is gone due to resistance….
    And that after returning with the decreased energy there is also resistance….hence the height rised when coming back is always lower than before….so it always doesn't hit…….

    Am I correct..?

    By the way a big fan of you teaching sir…
    My salutes to you sir!

  4. I have here sniff mm good cocaine, I mean uhh I mean a pendulum. 0:00

    Sorry for making fun of him sniffing

  5. The Great Physicists' Road Trip by Ms. Rachel C. Millison

    Great physicists from the past decide to return to Earth for one last road-trip vacation to the coast together. They all appear on Earth on the designated evening. Heisenberg pulls up behind the wheel of a gigantic 1930's car, a huge grin on his face.
    As they're getting in the car, Hubble looks up and says "What a wonderfully dark sky".
    "Shouldn't be" responds Olbers.
    "Always has been" says Hoyle.
    "No, it hasn't" says Lemaitre.
    "I knew that!" says an embarrassed Einstein.
    Once they're all in, Teller says "Hey guys, this trip is going to be The Bomb!".
    "Yeah, but why do I always have to organize?" asks Oppenheimer.
    "Where exactly will we end up?" asks Kepler.
    "That's impossible to predict" says Bohr.
    "I just can't believe that's true" says Einstein.
    Heisenberg punches the throttle and the old car roars off.
    "Say – this thing sure accelerates" says Newton.
    "I don't know, Isaac. It feels like gravity to me" smirks Einstein.

    Later that night, as they are speeding down a country road, a police car catches up to them and pulls them over.[1]
    "Do you know how fast you were going?" the cop asks. [1]
    "No, but I know exactly where I am" Heisenberg replies. [1]
    The cop says "You were doing 55 in a 35" [1]
    Heisenberg throws up his hands and shouts "Great! Now I'm lost!" [1]
    The cop thinks this is suspicious and orders him to pop open the trunk. He checks it out and says "Do you know you have a dead cat back here?" [1]
    "We do now, asshole!" shouts Schrodinger. [1]
    "I think it's time to split" says Everett.

    "Say, how did you manage to spot us on such a dark night?" asks Hubble.
    "I saw the light from your head lamps" says the cop.
    "How fast was it going?" asks Michelson.
    "That's simple addition" giggles Galileo.
    "Not exactly" says Lorentz.
    "Look here" says Heisenberg, "how do you know I was going that fast?"
    "I clocked you over a measured distance" says the cop.
    "How often?" asks Hertz.
    "I disagree with your measurement, officer" interjects Einstein.
    "Don't start tonight, Albert" says Bohr, shaking his head.
    "What Herr Einstein is trying to say" continues Heisenberg, "is that time was running at a different rate for you than for us".
    "WHAT!!!???" exclaims Newton.
    "It's true" says Maxwell. "We're all famous scientists and, believe us, Herr Einstein has proved it, though it came as no surprise to me".
    "Sounds complicated" responds the cop.
    "I'll draw you a simple diagram" says Feynman.
    Totally flummoxed, the cop lets them go with a warning. As he drives away, Doppler cocks his head and listens to the sound of the receding police car. "Gotta love that" he says.
    "Amen" responds Hubble.

    Returning to their car, Lord Kelvin remarks "Sure is warm tonight"
    "Yep – lots of disorder" replies Boltzmann.
    "In places you'd never expect" adds Hawking.
    "I was lucky to get away with that" says Heisenberg. "Most cops think they're better than everyone else".
    "Yes – I hate inequality" adds Bell.
    "Though you were speeding" says Faraday to Heisenberg. "I carefully observed the needle creep from 35 to 55".
    "Actually, it was jumping, Michael" replies Planck.
    "Hey, Max" says Heisenberg, "If you loan me a tiny bit of money, I'll pay it back so quickly you'll never notice it was gone".

    As they pile back into the car, Bohr says "See here – you must fill the seats in order – no empty spaces allowed. And stop interfering with each other!"
    "Only one of you can sit next to me!" yells an agitated Pauli.
    "Say, Werner – it's stuffy in here. Be a good chap and crack the window a bit" says Hawking.
    "Sorry, Stephen. It can be all the way up or all the way down, but nowhere in between" replies Heisenberg.
    "Hey guys – Albert and I just figured out a great shortcut. Only one bridge" announces Rosen.
    "It will save us a lot of distance" says Einstein, "but it might get spooky".

    Arriving at the beach the next morning, they hurry from the car and stand looking out over the ocean.
    "Look at the wonderful waves" says Schrodinger.
    "They don't look like waves to me" says Bohr.
    Looking down at the fine sand, Dirac exclaims "Look at all the particles!"
    "Now those look like waves" says De Broglie.
    "This is great!" exclaims Feynman, rubbing his hands together. "Now, lets go meet some girls!"
    "Let's delay" says Wheeler.
    "We have to be discrete" warns Bohm.
    "Girls? NEVER!" exclaims Newton.

    1 Based on, and including the original, attributed to Rich Granger, engineer, Battelle.

  6. how the hell did the glass break if he set the ball right next to it and let it go, the very law he is explaining says that couldnt happen

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