Being in a Physics Lab in my College time has been the most emotional moment for me. I can not say even today why. I graduated in Chemistry/Biology. But now after so many years, I am learning Physics and I love watching these videos. Thank you, Professor!
+magicmike1122 If a uniform cable (length L) is hanging then the tension is the highest at the top as the mass of the cable below that point is the highest, at the bottom the tension is zero. The tension is linear in y (y=0 at the bottom, y=L at the top).
shrey mahar Lectures by Walter Lewin. They will make you ♥ Physics. 1 hour ago (edited) mg=2T*sin(theta). Thus if the rope is long, sin(theta) is near zero and T is HUGE. Keep in mind that the vertical component of 2T must be mg. If the rope is short, again the vertical component of 2T must be mg. That is ONLY possible if 2T is close to mg. Example long rope: if sin(theta)=1/200, then T=100 mg. Example very short rope: The minimum value of T is when sin(theta) = 1. Then 2T=mg thus T=mg/2.
I hate physics bcoz i never understand it properly ....but ur videos r osm i wanna wacth all and sir i want to choose my profession as phy. Teacher 🤷♀🌼🌼🌼🌼😀😀😀😅
question unclear. A Normal force is by definition a force that is the component of a reaction force perpendicular to a surface. Place an object on an incline - the incline pushes back and the component of the reaction force perpendicular to the incline is the normal force. It's OK to call any perpendicular component of any force "normal" but that's not very common and no too useful either and you will then have to define relative to what. So please be more specific.
I mean when you make free body diagram here(0:49) then when you balance 'mg' then you do not use the word 'normal force' but instead you say that the tension on 2 sides is balancing it so that's why I asked whether a rope like this can exert a normal force?
A net force mg upwards is needed. I called it N. I would not call that a "normal" force, but what it's called is irrelevant. If someone wants that "normal" I can sleep with it.
Being in a Physics Lab in my College time has been the most emotional moment for me. I can not say even today why. I graduated in Chemistry/Biology. But now after so many years, I am learning Physics and I love watching these videos. Thank you, Professor!
It's just beautiful how all of nature follows rules and there are people like you to explain it to us
Ps: you look extremely young in the video ::)))
Sir i wish to travel to america to attend to one of your lectures❤️❤️🌹
cleared my doubts sir #makemescieitific
What about a hanging cable? Is the Tension tangent to the cable at any point, and if so, why? Is the Tension the same throughout the rope?
+magicmike1122 If a uniform cable (length L) is hanging then the tension is the highest at the top as the mass of the cable below that point is the highest, at the bottom the tension is zero. The tension is linear in y (y=0 at the bottom, y=L at the top).
In case of the spring will the total extension be 2x?
What if the mass.of the body is so low that it does not create tension then the numerics change ?
Sir from where I can get this type of questions
yes sir.
but what if the length is low, will the tension be high?
shrey mahar
Lectures by Walter Lewin. They will make you ♥ Physics. 1 hour ago (edited)
mg=2T*sin(theta). Thus if the rope is long, sin(theta) is near zero and T is HUGE. Keep in mind that the vertical component of 2T must be mg. If the rope is short, again the vertical component of 2T must be mg. That is ONLY possible if 2T is close to mg. Example long rope: if sin(theta)=1/200, then T=100 mg. Example very short rope: The minimum value of T is when sin(theta) = 1. Then 2T=mg thus T=mg/2.
Sir how we find tension if the pulley have mass and the string is also strechible
I cover this in 8.01
@@lecturesbywalterlewin.they9259 sir why we don't consider intermolecular forces in calculation of nlm
@@ronitdahiya7523 we consider point masses when we use nlm
In 2:26, if the point was massless, why would it have an infinite acceleration?
Eduardo Elihu Munguia Gonzalez f=ma hence if mass is0 and force is not 0 acc hast to be infinite
I hate physics bcoz i never understand it properly ....but ur videos r osm i wanna wacth all and sir i want to choose my profession as phy. Teacher 🤷♀🌼🌼🌼🌼😀😀😀😅
Can the rope exert a normal force?
question unclear. A Normal force is by definition a force that is the component of a reaction force perpendicular to a surface. Place an object on an incline - the incline pushes back and the component of the reaction force perpendicular to the incline is the normal force. It's OK to call any perpendicular component of any force "normal" but that's not very common and no too useful either and you will then have to define relative to what. So please be more specific.
I mean when you make free body diagram here(0:49) then when you balance 'mg' then you do not use the word 'normal force' but instead you say that the tension on 2 sides is balancing it so that's why I asked whether a rope like this can exert a normal force?
A net force mg upwards is needed. I called it N. I would not call that a "normal" force, but what it's called is irrelevant. If someone wants that "normal" I can sleep with it.
What I meant to ask was if this was a floor or an incline, we would have happily called it a 'Normal force' but here we don't........
Yes, very happily - But Yash it's OK with me if anyone wants to call this a Normal Force.
Sir I am studying in class 9 my teacher asked me about rest mass can you please explain.
use google
@@lecturesbywalterlewin.they9259 🤣 You're a legend
Sir pdf de dijiye please