I dont quite understand, 5:40, -Kx = ma so the only force when the thing is moving is the spring force? when it starts moving the gravitational force just disappears?
That is always the "mystery" of a mass suspended from a vertical spring. Before you begin the simple harmonic motion, you take a mass and hang it on the spring and allow it to come to the equilibrium point. At this point the force of gravity is negated by the force on the spring and the net force on the mass is zero. (the force of gravity has essentially be cancelled out). Now you pull down the mass an additional distance (A) and let go.
im still kind of confused as to why kS_0 was negative, because, by definition, wouldnt the restoring force have to be equal to the force downward for it to be in equilibrium? how can it be in equilibrium when the forces are not equal to eachother?
Take a look at this video, it may help you understand: Physics - Mechanics: Ch 16 Simple Harmonic Motion (1 of 19) Why is There a (-) in F=-kx? th-cam.com/video/pKKfmthLNmQ/w-d-xo.html
sir if time period of a spring M is T if it cut into four peices and mass is same the what will be the ne timeperiod??and u are doing an amzing job and keep doing such an amzing work
I didn't quite get the part where you stated that the mass is the same (since if you cut a spring into 4 (equal) pieces the mass of each piece would be 1/4 of the whole spring. If you cut the spring into 4 pieces the spring constant would be 4 times as high for each piece.
Sir how can we plug the value of "ks" obtained in step 1 in step 2.I mean Ks was equal to mg only when for a moment when there was a condition of static equilibrium and the step 2 involves the accelerated motion of the block.Then how can we plug ks=mg.Please help me Sir I am really confused in it
+Rahul Tiwari Rahul, I am not sure about what you are asking, but let me try to answer your question this way: 1) When mg is suspended from the spring, the length of the spring will be increased by s. The object suspended from the spring is now at the equilibrium point 2) When you then pull on the mass with an additional force F, the length of the spring will increase by an additional distance x. 3) k is the spring constant 4) x is the distance from the equilibrium point.
Sir, I didn't understand how the 'A' in the last step got equated with 'X'...please help me in that sir and what's the meaning of double derivative of 'X'??
thank you for your great explaining but i have a question you put fg+fs=ma i understand fs and fg with negative sign why you dont put ma with negative sign also i mean why ma dont equal =ks+kx+mg without negative sign with ks and kx and mg to make sum of forces in x direction =0 ma-fs-kx=0.0 thanks alot
It depends on how you want to write the equation. If you express the equation in vector form, then yes, you must include the signs. If you use the magnitudes of the forces, then you don't need the negative signs.
then what is the sign of ma as a vector ... if i dont use sign then ma=kx+mg+ks then ma-kx-mg-ks=0 then ma-kx=0 not same as ma+ks=0 ... wish you explain this? thanks
I think the confusion comes from the concept where the force of a spring is defined as: F = - kx Take a look at the first video in this playlist which will explain that. PHYSICS 16 SIMPLE HARMONIC MOTION AND PENDULUM
There are a number of reasons for it. One of them is that after watching a few videos, the student begins to understand the basic concept and doesn't have the time (or the staying power) to watch the rest of them.
Michel van Biezen I just thought it was because gradually the level keeps intensifying to God Mode and only the elite can keep up. Huge fan by the way, you have helped me so much! And I am just in high school 😅
Sir I really love the way you explain about physics...thank youuu..i got a good grades after watching your videos and i'm a huge fan of you
We are glad our videos helped. Thanks for sharing.
anybody else has "welcome to lectern online" stuck in their heads after watching these videos?
I really like your videos. Thanks for doing them.
thank you sir ，your videos is so helpful for our studies！
this helped me hopefully get a good grade in my physics IA..... THANK YOU SO MUCH !!
The videos will definitely help. Studying and commiting the solution techniques will be key to doing well on the exams.
Sir you are the best👍🏻🙂
I dont quite understand, 5:40, -Kx = ma so the only force when the thing is moving is the spring force? when it starts moving the gravitational force just disappears?
That is always the "mystery" of a mass suspended from a vertical spring. Before you begin the simple harmonic motion, you take a mass and hang it on the spring and allow it to come to the equilibrium point. At this point the force of gravity is negated by the force on the spring and the net force on the mass is zero. (the force of gravity has essentially be cancelled out). Now you pull down the mass an additional distance (A) and let go.
Amazing👍👍👍
Thanks 🤗
You help me a lot...thanks sir🙆😇😃
Thank you very much, Sir.
You are most welcome
im still kind of confused as to why kS_0 was negative, because, by definition, wouldnt the restoring force have to be equal to the force downward for it to be in equilibrium? how can it be in equilibrium when the forces are not equal to eachother?
Take a look at this video, it may help you understand: Physics - Mechanics: Ch 16 Simple Harmonic Motion (1 of 19) Why is There a (-) in F=-kx? th-cam.com/video/pKKfmthLNmQ/w-d-xo.html
thank you!
sir if time period of a spring M is T if it cut into four peices and mass is same the what will be the ne timeperiod??and u are doing an amzing job and keep doing such an amzing work
I didn't quite get the part where you stated that the mass is the same (since if you cut a spring into 4 (equal) pieces the mass of each piece would be 1/4 of the whole spring. If you cut the spring into 4 pieces the spring constant would be 4 times as high for each piece.
Thanks a lot. Love from sudan
thank you
help full tysm....
Thanks alot 🤗
good stuff
Sir please upload how to proof physics constant
Sir how can we plug the value of "ks" obtained in step 1 in step 2.I mean Ks was equal to mg only when for a moment when there was a condition of static equilibrium and the step 2 involves the accelerated motion of the block.Then how can we plug ks=mg.Please help me Sir I am really confused in it
+Rahul Tiwari
Rahul, I am not sure about what you are asking, but let me try to answer your question this way:
1) When mg is suspended from the spring, the length of the spring will be increased by s. The object suspended from the spring is now at the equilibrium point
2) When you then pull on the mass with an additional force F, the length of the spring will increase by an additional distance x.
3) k is the spring constant
4) x is the distance from the equilibrium point.
Sir, I didn't understand how the 'A' in the last step got equated with 'X'...please help me in that sir and what's the meaning of double derivative of 'X'??
x = A at the maximum displacement of the mass. Thus A is called the AMPLITUDE of the oscillation.
@@MichelvanBiezen Thank you sir
thank you for your great explaining but i have a question you put fg+fs=ma i understand fs and fg with negative sign why you dont put ma with negative sign also i mean why ma dont equal =ks+kx+mg without negative sign with ks and kx and mg to make sum of forces in x direction =0
ma-fs-kx=0.0 thanks alot
It depends on how you want to write the equation. If you express the equation in vector form, then yes, you must include the signs. If you use the magnitudes of the forces, then you don't need the negative signs.
then what is the sign of ma as a vector ... if i dont use sign then ma=kx+mg+ks then ma-kx-mg-ks=0 then ma-kx=0 not same as ma+ks=0 ... wish you explain this? thanks
I think the confusion comes from the concept where the force of a spring is defined as: F = - kx Take a look at the first video in this playlist which will explain that. PHYSICS 16 SIMPLE HARMONIC MOTION AND PENDULUM
I am kinda confused about the term"x" and "s", don't they represent the same concepts? Thank you! awesome videos
I understand it. The movement starts from stationary
thank you ，It will be better express Equation of motion with vector，force or acceleration has its own direction.
Beautiful! 😂
Thanks 😅
It’s hilarious that with each video in the series the number of viewers decreases exponentially 😂😂😂
There are a number of reasons for it. One of them is that after watching a few videos, the student begins to understand the basic concept and doesn't have the time (or the staying power) to watch the rest of them.
Michel van Biezen I just thought it was because gradually the level keeps intensifying to God Mode and only the elite can keep up. Huge fan by the way, you have helped me so much! And I am just in high school 😅
Thank you very much, sir.
You are most welcome