Potential Energy || Work and Energy || in Hindi for Class 9
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- Опубликовано: 7 сен 2024
- In this Science (Physics) video in Hindi for Class 9 we discussed on the potential energy of a body. We also derived the expression for the gravitational potential energy. This is a topic from Chapter 11 - 'Work and Energy' for class 9th from NCERT.
Potential energy is the energy possessed by a body due to its position / height.
Gravitational potential energy of a body of mass m situated h height from the ground is said to be mgh [here gravitational potential energy of that body at ground is considered to be zero]
When we pull the string of a bow, we do not observe any kinetic energy. But when we release the string, the arrow gets kinetic energy. But what happens to the work we do, when we pull the string. The energy is stored in the bow and this energy is known as the potential energy (more precisely, elastic potential energy).
In the above situations, the energy gets stored due to the work done on the object. The energy transferred to an object is stored as potential energy if it is not used to cause a change in the velocity or speed of the object. You transfer energy when you stretch a rubber band. The energy transferred to the band is its potential energy. You do work while winding the key of a toy car. The energy transferred to the spring inside is stored as potential energy. The potential energy possessed by the object is the energy present in it by virtue of its position or configuration.
Similarly, when we lift a body to a height, we do not observe any kinetic energy. But when we release the body, it gets kinetic energy. When we lift the body, the energy is stored as potential energy (more precisely, gravitational potential energy).
An object increases its energy when raised through a height. This is because work is done on it against gravity while it is being raised. The energy present in such an object is the gravitational potential energy. The gravitational potential energy of an object at a point above the ground is defined as the work done in raising it from the ground to that point against gravity.
Consider an object of mass, m. Let it be raised through a height, h from the ground. A force is required to do this. The minimum force required to raise the object is equal to the weight of the object, mg. The object gains energy equal to the work done on it. Let the work done on the object against gravity be W. That is,
work done, W = force × displacement
or, W = mg × h
or, W = mgh
Since work done on the object is equal to mgh, an energy equal to mgh units is gained by the object. This is the potential energy (EP) of the object.
So, Ep = mgh
It is important to note that the work done by gravity depends on the difference in vertical heights of the initial and final positions of the object and not on the path along which the object is moved.
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🔴 Click here to watch the whole playlist on Chapter 11 : 'Work and Energy' for Class 9 :
• Work and Energy (Intro...
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Previous videos :-
🔴 Work and Energy (Introduction)
• Work and Energy (Intro...
🔴 What is Work
• What is Work ?? (Work ...
🔴 Sine, Cosine and Tangent (Trigonometry)
• A little talk on Sine,...
🔴 Advanced concept on Work (Dot Product)
• Advanced concept on Wo...
🔴 Kinetic Energy
• Kinetic Energy || Work...
🔴 Kinetic Energy - Part 2 (Numericals)
• Kinetic Energy - Part ...
🔴 Kinetic Energy is Relative to the Observer
• Kinetic Energy is Rela...
🔴 Force required to LIFT an object against Gravity
• Force required to LIFT...
Very useful video, Sir. Your teaching skills are the best. Carry on. One day you will be the best teacher of India. Thanks a lot. Love you sir ❤️❤️ Take care of your health ☺️☺️🙏🙏
Marvellous video on physics I think you are a spectacular trainer in the field of physics
Energy is Just a number we assign to a system, which can be transferred. When we lift a ball the potential energy increases but in reality the distance between the earth and ball increases and therefore when we leave the ball, ball travels for longer time and gains higher velocity and we say that the potential energy got transferred in kinetic energy but as energy is just a number we assign then we can work without the concept of energy but then it will be difficult to deal certain situations which the concept of energy simplifies.
Is my reasoning correct sir?
sir, ek doubt hai..
E(P) = mgh
hum force object ke weight me laga te hain aur opposite direction of weight.
To hum formula mein E(P) = (-mg)h bhi toh le sakte hain.
leking hum lete nahi hai.
aisa kyun sir?
You're really a great teacher
Nice info 👍
जब हम तीर धनुष में तीर पर बल लगते हैं तो तीर पीछे की ओर गति करता है मतलब हमारे द्वारा किए गए कार्य पहले गतिज ऊर्जा में बदलता है उसके बाद स्थितिज ऊर्जा में
क्या यह सही है? 🤔
lot of difference in 8th and 9th... some basics of 9th should be in 8th so that a student can learn the terms in 8th and use them in 9th without this much confusion.
Yes. You are absolutely right.
But this jump (8th to 9th) is nothing in comparison to the jump from 10th to 11th.
🙏🙏🙏
@@edupoint.secondary Thats one of the reason my brother left school 😂😂 lol
Please send my good wishes to you brother.
Being a teacher I find myself unsuccessful as your brother could not find learning interesting.
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@@edupoint.secondary We need more teacher like you who spend their free time to make educational videos like you are doing Sir! Thanks for making these videos and helping us in this pendemic time.
Sir you're really a great teacher . 🙏🙏🙂
thank you sir
U teaching mthd is just amazing 🔥🎉
😳😳🤩🤩🤩😍proper explanation
Hello Sir,
When you will make a RUclips channel for class 10????
I can't explain you how much i love your vedio. You are the best motivator and teacher i have ever got. You are my source of inspiration and motivation. May god bless you. May allah keep you safe from corona.
Ain't you from bangladesh
Abe saale glt pdha rha ha wo
Hello sir please make videos of 12 th class
This video is useful for us
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*Sirr thank youuu sooo much* 🙏
Sir agr koi object ground pr rest pr rkha gya hai to kya uske andar bhi potential energy hogi?
Sir, your teaching method is amazing
Sir, You r all time genius.💐🙏
Best physics teacher❤ thanks sir
Well done. Sir....I m also science teacher....
Your explanation is great! Sir
Sir ,, when work is done some energy is consumed then in the case of bow and arrow :when the string is stretched with the arrow work is done and some energy is consumed and this energy is known as potential energy and the arrow flying off the bow that potential energy converted into kinetic energy. SIR, can I explained it correctly??
I think you wanted to say, "Did I explain it correctly?"
Yes you did.
খুব ভালো 😀😀😀😀
Sir ! In case of bow. Kinetic energy increases. but we know that when kinetic energy increases than potential energy must be decreases. But in case of bow, the arrow is at same height. Than how we can say that here potential energy is decreased???
Potential energy tarah tarah ka hota hai. Aap sirf gravitational potential energy ko hi consider kar rahe hain.
Sir aapne toh sare doubts h clear kar diye,thank you sir
Nice 👍👍👍 keep it up 👍❤️❤️❤️❤️❤️
sir maza aa gya dekh kr....🙏❤️
Sir , How the height of object make difference in potential energy? Explain.. ,,,,, not using the formula.......
One more,
Suppose ,, I am standing , then Have I potential energy ??? If yes then when I go at some some height then why our potential energy increase????????
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I'm 1th viewer
Not 1th , its 1st
Please give the answer if we take a ball to h height from surface of the earth the potential energy will be mgh now if the ball falls downward gravitational force work on the ball now if gravity does work on ball and work is positive then ball 's mechanical energy will be more than mgh but still it's conservative to mgh why
If we apply some extra force along with "mg" to lift the body to a height of "h"(i.e. mg+F) then....some extra work will be done to lift the body. As we know the work we had done on the body is stored in form of potential energy....then...here body present in same height from the surface will possess different potential energy.....how is this possible?? Plz...tell me what is right?
Bro dekh ye work done kewal Ek me convert hota ha na ki Ep ye glt pdha rha ha dekh hota ye ha ki jb ball ko upr lejate ha to niche mg ek force lgta ha ar tu jis height tk usko displaced krega yani H to work done by gravity hoga mgh ar kyuki opposite direction ha to -mgh ab dekh work done barabar change in kinetic energy to -mgh energy km hoga (gravity ke work done ke karn ) kyuki ball and earth ek system consider kia gya ar kch nhi ha yeha pr to uska mgh jo kinetic energy km horha ha wo Ep me convert horha ha
Sir phsics ke master hai jitna ho sake sir ji ke video ko share karo aur subscribe karo
👌
Sir, Please make video on S.st chapter-2
Sir ,, when a brick is placed on the ground then it has also potential energy ,,then from which this potential energy comes from???
The force of gravity and is called gravitational potential energy
👌👌👌👌👌👌👌
Sir, i have confusion on law of conservation of energy. I have taught that one form of energy can be transferred to another kind. You have told in your vedio that when a ball hits ground its mechanical energy converts into sound, vibrational energy. After that what happes to that energy ? How is it transfered to another form of energy.?
In case of magnet i think the concept of potential energy is wrong
Khoya hua interest fir aa gya
sir aap bahut achha samjate ho .. ❤❤
Sir Iam heartly requesting you to make playsit on class9 biology.
Biology 1st chapter "the fundamental unit of life" is available.
2nd chapter is coming soon.
🙏🙏🙏
Sir mujhe last k chap. Ki playlist chahiye.
Wa maja a gaya padh ka
Awesome 👍👍👍
U r amazing sir 🙏
Sir what do you do for living
Wa
Sir, jab kisi object ko gravity ke against lift kiya jata hai, tab wo force uske weight jitna hi hota h..... Kya bow ke string ko pull karte samay aisa kuchh hota h ?
Please learn "elasticity".
It is very easy to understand.
@@edupoint.secondary Ok sir!
I tried to understand this by watching videos of various channels.. nothing helped me 😭 but once I watched ur video everything is clear 😀😀😀😎😎 Thanks 👍👍❤️❤️❤️🥰
Love you sir
when we strech the string of arrow, There is force and displacement in the direction of the force...So W=f*s ....But How is work done by the string when there is no energy in that...?For a object to do work ,Energy must be in it..
String and bow retain energy due to the stretching of string and bow.
Learn 'Elasticity' from class 11.
आप हमें पढ़ाने के लिए किन किताबो का उपयोग करते है सर?
सर, इसे गलत नजरिए से मत लीजिएगा,,मैंने बस जानकारी के लिए पूछा!
N.C.E.R.T book class 9
Sir aap mahan ho
Beta
Hi sir
Hello Mrunal.
Sir kyu glt pdha rhe ho jb jyada work krenge usko upr lejane ar jb km krenge tk dono hi case me same potential energy hoga agr work done hi potential energy me convert hota to phir jb hmlog jyada force se usko upr displaced krte to uske pass jyada potential energy hota
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8:25 sir kya aapp bata skte hai ki moon jab earth ke pass aaya tab hi speed kyu badi phele kyu nii bad gyi
Aisa hi gravity wala chapter MEIN hua hai usme bhi jab earth sun ke pass hoti hai tabi fast move krti hai phele niii
Aisa kyuuuu ????
Mera dimag subah se isi mein laga hua hai kuch samajh nii aa rha
And sir Jan moon ko leave kiya jayega wha se tab wo Earth ke aas pass ghumne lgegega earth ki taraf girega kyu aake agar aisa hai toh jo sun se bauht du hai planet wo bhi gurte aake sun ke pass
Commant delate kar diya
1.5x
How work is getting converted into stored energy plzz telll 🙏🙏🙏🙏🙏🙏
Work is the process of conversion of the form of energy.
I'm 2.1k viewer
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