Center of Mass

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  • เผยแพร่เมื่อ 11 ม.ค. 2013
  • Center of Mass and stability demonstrations
    It is useful to note that the mass-center is a fixed property for a given rigid body (e.g. with no slosh or articulation), whereas the center-of-gravity may, in addition, depend upon its orientation in a non-uniform gravitational field. In the latter case, the center-of-gravity will always be located somewhat closer to the main attractive body as compared to the mass-center, and thus will change its position in the body of interest as its orientation is changed.
    In the study of the dynamics of aircraft, vehicles and vessels, forces and moments need to be resolved relative to the mass center. That is true independent of whether gravity itself is a consideration. Referring to the mass-center as the center-of-gravity is something of a colloquialism, but it is in common usage and when gravity gradient effects are negligible, center-of-gravity and mass-center are the same and are used interchangeably.

ความคิดเห็น • 118

  • @dcpowered
    @dcpowered 5 ปีที่แล้ว +61

    Excellent explanation with practical approach. The best video on this topic!

  • @praveenkaintura736
    @praveenkaintura736 3 ปีที่แล้ว +7

    Here in India we like your lectures a lot.great clarity.sir...Love from India

  • @swaggattarius4355
    @swaggattarius4355 4 ปีที่แล้ว +5

    After hearing people explain why men cant do the 'chair challenge' but women can, I had to find out the real reason and how to explain the difference.
    Thank you so much, my brain feels at peace again. Lol

  • @RogelioJaimes-bz4rs
    @RogelioJaimes-bz4rs 2 หลายเดือนก่อน

    Muy interesante la explicación con cosas sencillas. Muchas gracias. Seguiré viendo sus videos. Saludos desde aqui Lima Perú presente...

  • @ConceptualCalculus
    @ConceptualCalculus 3 ปีที่แล้ว +2

    Thank you. I love this. It really gets the concept across. I'm teaching Calculus 3 students how to use multiple integrals to calculate the coordinates of the center of mass of an object. The textbook is full of formulas and details, but I wanted to open with something more conceptual. This is perfect.

  • @gonzalezgavino
    @gonzalezgavino 10 ปีที่แล้ว +3

    Que bueno Sr. David!!
    Really good Mr.David!!
    Gracias thanks merci....grazas

  • @jimmybindra
    @jimmybindra 4 ปีที่แล้ว +1

    very nice ...thanks for this ...I went back to this old school logics before I prepare myself to order an outdoor Almirah with wheels underneath. And this video has certainly helped !!

  • @MiHaFi
    @MiHaFi 9 ปีที่แล้ว +27

    Really you have done a great job , I am really proud of you , in 2 years I am gonna be physics teacher and I hope to be as good as you and have that same ambition

    • @Zuhaib_0
      @Zuhaib_0 4 ปีที่แล้ว +10

      Oshy Chan so are you a teacher now?

    • @yash7113
      @yash7113 4 ปีที่แล้ว +5

      @@Zuhaib_0 🤣🤣

    • @cindy77777
      @cindy77777 2 ปีที่แล้ว +3

      now you've been teaching since 4 years !!

    • @akiaopiah1889
      @akiaopiah1889 ปีที่แล้ว +1

      It's been 5 years now!!!

    • @ADHIRAJ_CHOUDHARY
      @ADHIRAJ_CHOUDHARY 3 หลายเดือนก่อน

      It's been 6 years now

  • @tasneemqadi5249
    @tasneemqadi5249 4 ปีที่แล้ว +2

    You're a genius!! Thank you SO much for this!

  • @naderkhaled9410
    @naderkhaled9410 4 ปีที่แล้ว

    This is an amazing method of explaining a physics topic !!

  • @abhisheknkv4908
    @abhisheknkv4908 ปีที่แล้ว

    I APPRECIATE YOUR EFFORTS SIR! A PRODUCTIVE 10MINS FOR MY EXAMS,THANKS A LOT!
    REMEBERING THIS VIDEO WAS A DECADE BACK,WOAHHH!👌

  • @neilbedajna8282
    @neilbedajna8282 3 ปีที่แล้ว +1

    Just awesome. Thanks for the video.

  • @ravisinha312
    @ravisinha312 6 ปีที่แล้ว +1

    Very nicely explained! Thanks!

  • @frs535
    @frs535 3 ปีที่แล้ว

    Thanks mate! Your video is amazing!

  • @ashishnagda9422
    @ashishnagda9422 4 ปีที่แล้ว +1

    Thank you a lot. I am in 9th grade and my concept got clear because of you. Thank You.😁😁

  • @toosikkid123
    @toosikkid123 8 ปีที่แล้ว +1

    Your the man David.

  • @Ayzlxn
    @Ayzlxn ปีที่แล้ว

    This is an amazing video thank you so much!

  • @user-dp8ip6kx6g
    @user-dp8ip6kx6g 8 หลายเดือนก่อน

    ❤❤ amazing teaching technic❤

  • @alicesenthil
    @alicesenthil 5 หลายเดือนก่อน

    I learnt a lot about centre of mass. I would definitely apply these demonstrations to my students. Thank a lot Sir

  • @TuExklusiv
    @TuExklusiv ปีที่แล้ว

    Really good video! Learning this stuff now in college!

  • @CADable
    @CADable 3 ปีที่แล้ว

    Nicely explained Professor!

  • @scoobydoow7988
    @scoobydoow7988 2 ปีที่แล้ว

    The best explanation ever !!

  • @k.krecords9838
    @k.krecords9838 ปีที่แล้ว

    Excellent explanation
    Your explanation is above of excellent

  • @jigarbhatiya3329
    @jigarbhatiya3329 4 ปีที่แล้ว

    Beautiful 😍.. I love you Physics

  • @lordmcswain1436
    @lordmcswain1436 9 ปีที่แล้ว +1

    To account for that, you could put a nail in the "thickness"or z axis side of the block and use a weight on the end of a string to find the line where the center of gravity must lie. Then, if you know the center of mass for the block if it were of uniform thickness (the center of mass for the x and y axis), you find their intersection.

  • @mohdyousuf5468
    @mohdyousuf5468 6 ปีที่แล้ว +1

    very helpful video thank u...

  • @fulsingh
    @fulsingh 9 ปีที่แล้ว +6

    You are an amazing teacher ,and must be a good human too :)

  • @habk8574
    @habk8574 ปีที่แล้ว

    Thanks for the demo

  • @parths.1903
    @parths.1903 8 ปีที่แล้ว +1

    nicely explained ,,,,,... :)

  • @shabshah4530
    @shabshah4530 5 ปีที่แล้ว +2

    you nailed it.

  • @jessicaquemado1527
    @jessicaquemado1527 5 ปีที่แล้ว

    This is gold Sir

  • @laouhai174
    @laouhai174 8 ปีที่แล้ว +1

    you are a very goooooooooood teacher thanks

  • @thzizbizthzizbiz7737
    @thzizbizthzizbiz7737 6 ปีที่แล้ว +1

    great vid

  • @nishtakasundass6669
    @nishtakasundass6669 4 ปีที่แล้ว +1

    Thanks. It helped me understand

  • @aishwaryagupta4635
    @aishwaryagupta4635 3 ปีที่แล้ว +1

    VERY WELL EXPLAINED SIR....

  • @omarabuassi9150
    @omarabuassi9150 11 ปีที่แล้ว +1

    That really helped :)

  • @ineedmedsk5441
    @ineedmedsk5441 5 ปีที่แล้ว +1

    Awesome thank you so much

  • @prudhviyadav2720
    @prudhviyadav2720 5 ปีที่แล้ว +1

    super experience of support is given for me

  • @conceptsinhand
    @conceptsinhand 5 ปีที่แล้ว +1

    Very well explained Sir

  • @angelojaysamidara766
    @angelojaysamidara766 5 ปีที่แล้ว +1

    hello proffesor what do call that string?

  • @cutieewi-fi7643
    @cutieewi-fi7643 ปีที่แล้ว

    Excellent explanation

  • @ejazahmad8066
    @ejazahmad8066 3 ปีที่แล้ว

    Nice one....

  • @sababatamanna2117
    @sababatamanna2117 4 ปีที่แล้ว

    It’s so fascinating

  • @RossGerard
    @RossGerard 10 ปีที่แล้ว +3

    Thanks. Good video.

  • @varadleleot2084
    @varadleleot2084 4 ปีที่แล้ว

    Nicely explained

  • @JamieJourney
    @JamieJourney 9 ปีที่แล้ว

    Thanks for sharing! Those are some great center of mass demonstrations!

  • @physicskipaathshala9708
    @physicskipaathshala9708 2 ปีที่แล้ว

    excellent....

  • @kryptocat4240
    @kryptocat4240 3 ปีที่แล้ว +1

    Excellent

  • @arjunsr9077
    @arjunsr9077 10 ปีที่แล้ว +1

    cool video..............

  • @imapcliya
    @imapcliya 3 ปีที่แล้ว

    Amazing

  • @sattarjabaar2668
    @sattarjabaar2668 3 ปีที่แล้ว +1

    Good

  • @albertbatfinder5240
    @albertbatfinder5240 2 ปีที่แล้ว

    What is the geometrical correlation between the shape and the downward force if gravity?

  • @lidisjfhdsj9745
    @lidisjfhdsj9745 5 ปีที่แล้ว +1

    that's good coz you re tching us more things than what we know

  • @asifch9901
    @asifch9901 3 ปีที่แล้ว

    excellent

  • @feybeka
    @feybeka 5 ปีที่แล้ว

    A lifesaver

  • @sohinipaul2429
    @sohinipaul2429 7 ปีที่แล้ว +1

    it was just amazing to hear you !!! ,thanks a lot !!!

  • @jlachapelle4771
    @jlachapelle4771 3 ปีที่แล้ว +1

    thanks bro

  • @markkennedy9767
    @markkennedy9767 ปีที่แล้ว

    Can you explain mathematically why we can always find a line through a lamina (eg a horizontal line y=a in some coordinate system on the lamina) such that the moments on either side of this line sum to zero. It's intuitively obvious physically (hanging plumb lines etc) as you describe here but I just can't prove this mathematically. The mathematics involves the integral of all the moments of every point mass of the lamina on either side of such a line, putting this integral equal to zero and solving for the coordinate of the centre of mass. But why can we always assume we can put such an integral equal to zero in the first place.

  • @cleisonarmandomanriqueagui9176
    @cleisonarmandomanriqueagui9176 4 ปีที่แล้ว

    So is center of mass us the same as center of gravity for at least objects at earth?

  • @alexpym8216
    @alexpym8216 4 ปีที่แล้ว +6

    7:12 rockets only use rcs thrusters for docking, for stability they use gimbal in the main engine.

    • @davidtaylorfuhsd
      @davidtaylorfuhsd  4 ปีที่แล้ว +4

      Thank you.

    • @davidtaylorfuhsd
      @davidtaylorfuhsd  4 ปีที่แล้ว +5

      I stand corrected on how a rocket keeps the center of mass above the propulsion force. Here's a video demonstration of how the gimbal can alter the direction of the rocket's thrust. th-cam.com/video/7196ru3wpjA/w-d-xo.html

  • @jannatulkhuludjafrin665
    @jannatulkhuludjafrin665 4 ปีที่แล้ว +1

    Wow!!!!

  • @vfgrfbgrb
    @vfgrfbgrb 4 ปีที่แล้ว

    Is center of gravity just force down but isnt same as center of mass

  • @thituyetoanhtran9019
    @thituyetoanhtran9019 6 ปีที่แล้ว +2

    Dear Professor,
    Terrific ! I've understood "center of mass" after watching your video ! Thanks a lot. But I have one question: I've read about the mass of center or "barycenter" of the earth-moon system; it is somewhere inside the earth ! In your video, the mass of center in inside only one object ( a piece of wood, a plastic bird or a rocket ......) whereas the earth and the moon are two totally different objects thousands miles away with no connection. How can they be considered as an object to have a common center of mass ?
    Silly Jack.

    • @biswajitdutta770
      @biswajitdutta770 4 ปีที่แล้ว

      Centre of mass among two particles can be calculated...

  • @Dezirro
    @Dezirro 10 ปีที่แล้ว +1

    Great. But, I would like to ask what if the thickness of wooden blocks shown in the first two experiments (regular and irregular shapes) is not uniform? Where is the centre of mass by looking at 3-D model?

  • @zawarhussain9314
    @zawarhussain9314 7 ปีที่แล้ว +1

    good

  • @vivekrajput4459
    @vivekrajput4459 2 ปีที่แล้ว

    Physics is awesome

  • @akhtarraaz5500
    @akhtarraaz5500 9 ปีที่แล้ว +1

    First of all, you are really very good sir and your videos are the most beneficial for practical explanation to elementary level students!
    Now my question is, does center of mass/gravity location depends upon the density of the material, and so the stability of that object? For example, I have a stick of wood and a same size stick of Iron, so, will there be any difference between the center of mass? Also, will it effect the effectiveness of balancing them on hand like you did with the broom stick?

    • @adekunleshittu569
      @adekunleshittu569 9 ปีที่แล้ว

      Hello ***** , irrespective of the density of the material if should have the same center of gravity and mass provided it has the same material throughout. That is to say, the equilibrium point is dependent on the geometrical shape (that is only when it is the same material)

  • @peerapolperso4938
    @peerapolperso4938 4 ปีที่แล้ว +1

    👍👍👏👏🙏

  • @DragonSageKaimus
    @DragonSageKaimus 10 หลายเดือนก่อน

    This is the closest to magic I have witnessed

  • @aishwaryanambiar4254
    @aishwaryanambiar4254 4 ปีที่แล้ว

    At 9:12, both the cups do not have the same volume of water right? What does the ping pong ball do, that makes the centre of mass higher in the cup on the left?

    • @davidtaylorfuhsd
      @davidtaylorfuhsd  4 ปีที่แล้ว

      Since there is no water inside the ping-pong ball, the center of mass of the water is higher. The amount of water is less, but the "point at which all the water's mass seems to be" is now higher than in the cup without the ping-pong ball.

    • @aishwaryanambiar4254
      @aishwaryanambiar4254 4 ปีที่แล้ว

      but why? Another concept I don’t quite understand is how an object’s center of mass can be outside the very object itself. ( the Fosbury flop )

  • @luciachlys5041
    @luciachlys5041 4 ปีที่แล้ว

    7:00 This would make an interesting practicle...

  • @MrRomulocunha
    @MrRomulocunha 3 ปีที่แล้ว

    so, in the last experiment, if you'd placed a golf ball (a heavy one) in the cup instead of a ping pong ball, the cup with only water would've tipped first, right?

    • @davidtaylorfuhsd
      @davidtaylorfuhsd  3 ปีที่แล้ว +1

      Yes, that's right. The c.o.m. would be lower and the cup would be more stable with a golf ball in the bottom. An extreme example of this would be the keel of a sailboat - very large mass at the bottom of the boat making it difficult to tip it over.

    • @MrRomulocunha
      @MrRomulocunha 3 ปีที่แล้ว

      @@davidtaylorfuhsd thank you so much for the answer Sir. This video is just brilliant.

  • @Zuhaib_0
    @Zuhaib_0 4 ปีที่แล้ว +1

    Am I the newest person to watch this?

  • @abdoeuldji3764
    @abdoeuldji3764 3 ปีที่แล้ว

    is there a difference between center of gravity and center of mass?

    • @davidtaylorfuhsd
      @davidtaylorfuhsd  3 ปีที่แล้ว +1

      It is useful to note that the mass-center is a fixed property for a given rigid body (e.g. with no slosh or articulation), whereas the center-of-gravity may, in addition, depend upon its orientation in a non-uniform gravitational field. In the latter case, the center-of-gravity will always be located somewhat closer to the main attractive body as compared to the mass-center, and thus will change its position in the body of interest as its orientation is changed.
      In the study of the dynamics of aircraft, vehicles and vessels, forces and moments need to be resolved relative to the mass center. That is true independent of whether gravity itself is a consideration. Referring to the mass-center as the center-of-gravity is something of a colloquialism, but it is in common usage and when gravity gradient effects are negligible, center-of-gravity and mass-center are the same and are used interchangeably.

    • @abdoeuldji3764
      @abdoeuldji3764 3 ปีที่แล้ว

      @@davidtaylorfuhsd thanks for the explanation

  • @ShareInfos516
    @ShareInfos516 8 ปีที่แล้ว

    I don't think they have the same amount of water because the ball takes some of the spaces in the cup. You need to measure the water first and put equal amount of water in both cups.

    • @davidtaylorfuhsd
      @davidtaylorfuhsd  8 ปีที่แล้ว +2

      +TES HAI It is the level of the water that is the same and not the actual volume of water. The fact that the ball takes up space with air is what causes the center of gravity to be higher in the cup with the ball.

  • @SumantXD
    @SumantXD 4 ปีที่แล้ว

    That's not teaching that's art..

  • @escanour7701
    @escanour7701 5 ปีที่แล้ว

    But the cups don’t have the same amount of water

  • @raenfox
    @raenfox 3 ปีที่แล้ว

    Bit confusing because you keep changing between the terms center of mass and center of gravity. Otherwise nice demonstration.

  • @trueislam7521
    @trueislam7521 5 ปีที่แล้ว

    #vov prof.

  • @thedugdugman45
    @thedugdugman45 3 ปีที่แล้ว

    the center of mass of an object is in the center

  • @wovarino
    @wovarino 3 ปีที่แล้ว

    he looks like he is doing this on gunpoint

  • @bushkipz3894
    @bushkipz3894 23 ชั่วโมงที่ผ่านมา

    Confirm one more view from😅🇰🇪

  • @dussypestroyer473
    @dussypestroyer473 3 ปีที่แล้ว

    😘

  • @user-fu8hq5ev6j
    @user-fu8hq5ev6j 3 ปีที่แล้ว

    4:04

  • @sattarjabaar2668
    @sattarjabaar2668 3 ปีที่แล้ว

    Ok

  • @mrorange3529
    @mrorange3529 9 ปีที่แล้ว +1

    Plum bob

  • @sunwukong2959
    @sunwukong2959 6 ปีที่แล้ว

    u talk about cog and then ur title is com.....hmmmm...it is not the same

  • @ragv2310
    @ragv2310 9 ปีที่แล้ว

    Although the title says "center of mass", he keeps talking about "center of gravity". Even tough, they could be in the same spot, they are not the same. This video did not help me at all.

    • @davidtaylorfuhsd
      @davidtaylorfuhsd  8 ปีที่แล้ว +1

      +Roberto Ganoza www.quora.com/Whats-the-difference-between-the-centre-of-gravity-and-the-centre-of-mass

  • @hassanahmadsheikh5130
    @hassanahmadsheikh5130 3 ปีที่แล้ว

    aren't you confusing Center of Mass with Center of Gravity

    • @davidtaylorfuhsd
      @davidtaylorfuhsd  3 ปีที่แล้ว +1

      In our experience here on Earth with the objects most of us deal with everyday, the center of mass and the center of gravity are in the same location. Very large objects where the pull of gravity can be different on the same amounts of mass due to the large distances involved, are not encountered in our everyday life.

    • @hassanahmadsheikh5130
      @hassanahmadsheikh5130 3 ปีที่แล้ว

      @@davidtaylorfuhsd ok

  • @Shaymi3_
    @Shaymi3_ 6 ปีที่แล้ว

    Mr Chen Sent Me Here?Anyone Else?

    • @ICreme
      @ICreme 6 ปีที่แล้ว

      online homeworkkkkzzz...