Coupled Pendulums

Two pendulums attached to the same horizontal string transfer their motion back and forth.

Category:

Entertainment

Tags:

• physics
• demo
• pendulum

[davidkris]

Damn this just demonstrated my last relationship... :-(

[KnightSurge]

Who cares if you're first, you dick?

[snorkellisab]

"harmonic motion"



[MrBananasplot]

As a 13 year old girl not even in 3rd year of highschool yet...I have absaloutly NO idea how any of this works but find it utterly and amazingly cool!

[XxWearsMexX]

i have one question. why?

[cforeroo]

Problem, physics?

[andreirocks1992]

aweeeeeeeeesome!



[Alkalite18]

Can someone tell me how this problem can be solved using a sum of torques? Think of the string as actually being a very weak spring. The transfer of energy must have something to do with the extension and compression of the spring, right? I think this because I think the compression and extension occurs due to the torque caused by the gravitational force acting on the pendulum. And this torque transfers to the other pendulum, slowly starting its swing. Any help would be greatly appreciated. 210

[Schaaf]

die beidlts ordentlich hin und her

[lunarknightlucian]

reminds me of the relation ship to the seat of a swing and the swinger's feet.

As you start off, the seat would be the pendulum on the left, and the feet would be the one on the right. they move much faster and farther to drag the swing upwards. then as you get really high, you cant go any higher, so your feet slow down and you just coast back and forth. untill your almost at rest again and then you repeat the process... that is untill you jump of of course.

[rawrimaprick]

do pendulums ever stop?

[icurays1]

theory: it's called coupled resonance. each cycle, the first pendulum perturbs the other a little bit through the string at the top (the string 'couples' them). Since they both have the same self resonant frequency, each cycle transfers energy constructively (very little loss due to phase difference). After a while, the second pendulum builds up enough energy to 'take over' and start drawing energy from the first one. then the process repeats, in reverse.