Pendulum Synchronization

[FPChris]

When the right ball was stationary the the left pushed the base to the right. This leaves the right ball now leftward and the left ball now rightward.

[Basement-Science]

I'm guessing it always synchronizes out of phase because your cylinders (or table) are not the best quality and have significant friction when rolling.
Therefore the phaseshift where they do not roll at all is preferred over the one where they would move maximally.

[dsntegrator]

We've all seen youtube Pendulum Synchronization recommendations, didn't you? : )
It is all good and fine, nice work!

[johnbaines]

Nice video Ludic, as always. I think that metronomes have a forced, rather than free, oscillation. The escapement is providing a constraining force - momentum cannot be transferred against the escapement so anti-phase forcing cannot happen. But with your free-hanging pendulums the whole structure moves side-to-side so there will be a natural damping of in-phase motion and a corresponding amplification of anti-phase transfer of momentum. Possibly ... :-)

[sphynxusa]

I think the resolution is related to the center-of-mass (CoM). Here the CoM remains fixed by anti-phase oscillation. In other experiments, where the pendulums are on a table (the base/platform), the CoM is again fixed. However, the table movement itself is out-of-phase with the system of pendulums.

Notice initially in your experiment, the cylinders are moving so as to keep the CoM the same. Then they stop moving and to keep the same CoM at a fixed position, the pendulums must operate out-of-phase. SOMETHING has to be out-of-phase, ether the base, or the pendulums, in order to keep the CoM fixed.

In the table system, the momentum of the base (i.e. the table) is out of phase with the pendulum system. But its movement is so small that it is not perceptible to the eye. This is because the mass of the table is typically much larger than that of the pendulums.

[-NGC--]

I love the underrated channels of YouTube, there’s so much cool stuff to be learned from them.

Yes veritasium made a video about this, but I think Ludic explains things a little better - and he has a fun accent

[davidabraham]

You need 3 and they will sync up identically
Also because of this they have to go equal and opposite to stay in equilibrium other wise they would roll off the table

[Physicsexperimentsdemos]

Perfect demo. It's just physics. The external force and torque of the system pendulums, wooods and cylinders is equal to zero. So momemtum and angular momentum conservated. Momentum and angular momentum is zero continuesly. Only out of phase happened this. Thank you for all demos i learn from you. You can see my channel we have many demos about physics.

[kenord]

Yeh, another good experiment, I am learning as well as the kids, thanks again mate.

[SquareRootOfNegativeOne]

to sync in phase the whole thing would have to rock back and forth and the only way that could happen is if the whole system's resonant frequency was the same as the freq of each pendulum. but i'm guessing

[bazman]

Another great very interesting video. Keep them up.

[master]

Really good experiment Ludic BTW the period of the pendulum depends on g and l.

[fourkings]

Why it only synchronised in out of phase?

[nattsurfaren]

What about using a magnet that repell?

[TD.SteveArcs]

This is the way the original discovery was made while the guy was at home during a period of sickness he hung two clocks on a beam if I remember?..
I suspect the synchronise in apposite phase to cancel each other out so the net force in any direction is zero? not sure why 🤣🤣
Excellent video as always mate

Steve

[andiback]

Very good and informative video! You very simply and mind blowing are showing both pendulums transporting no mechanical vibrations to outside world when 180 degree out of phase. Thus I have question Sir: If you use e.g. two indentical electrical transformers, is it possible to reduce hum sound with these both transformers mounted solid to one housing? The incoming ac voltage of each other 180 degree antiphase on their primary sides and on the secondary sides both voltage wave forms rectified and conclued to one voltage for dc output?

[MrIC]

Can u do a video about latching a circuit, basically i want to turn on a circuit by a push button and turn it off again by that push button only. I like your explaination