Why don't perpetual motion machines Does time exist? - Andrew 1 day ago   05:31

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Perpetual motion machines — devices that can do work indefinitely without any external energy source — have captured many inventors’ imaginations because they could totally transform our relationship with energy. There’s just one problem: they don’t work. Why not? Netta Schramm describes the pitfalls of perpetual motion machines.

Lesson by Netta Schramm, animation by TED-Ed.

Comments 11242 Comments

Chetan Naik
Isn't earth almost a perpetual motion machine which is going around sun for almost 4.5 billion years which will continue to do so for another 4.5 billion years?
Vandana Agarwal
Hey I have a idea!
Oystor Sauce
then why earth moving continously ?
Michael Soprani
I'l moto genera attrito e l'attrito logora la materia.
Xianne Pol
For now the one thing that seems truly perpetual is our search.
Jesse Fritz
Physics actually allows it... Just needs the right configuration. Physics are just lines of text in a book. You can get past them!!! The Earth turns with nothing physically touching it and it's been going before man was in the Earth. Please explain how this is happening. The largest object man had come into contact with and it's moving.
D Mac
The American political establishment is one big perpetual motion machine powered by idiocy. And...we're just about finished making ours up here in Canada; but our runs on maple syrup and identity politics.
Dale Power
Okay, if we define "perpetual motion" in the way given above, then it cannot exist in a finite universe. Full stop. Do not even try to pass go. Nothing lasts forever.

IF, however, we look at machines that simply run without external power for a really long time... Then we already have some massive examples. The Moon travels around the earth, without stopping for petrol. The Earth around the sun and so on.

Sure, it ISN'T perpetual... But billions of years of motion truly falls into the range of what inventors really mean when they are designing a machine to run without batteries or a waterfall nearby to power it.

There are two definitions in use. The scientific and the common. The common definition might be achievable in time.
Kaloyan Bankov
Cause the Chineses haven't tried it yet
Kevin Y
The Earth is as close to a perpetual motion machine as we will get.
d rouse
It seems like that magnet and a ball would work . Maybe an elongated hole .
Toys R Fun
Isn't the earth in Perpetual Motion? Anyone?
m smith
The hydro dam is a perpetual machine
Fission is a good way to go idk why it not online now why not just make a sun
Perpetual motion machines don't work because there are Laws of physics.
You fight the Law, and the Law is going to win, every time.
Esequiel Tovar
Im not a scientist but how are they so sure about the thermodynamic laws
remi -
ummmm......... watch this https://ufl.ae/videow/50Qqw0Z0Gu4
Tobias Pause
Well the fact that energy exist means it has to increase somehow. If you only could loose energy everywhere than the universe would be an still unvoving place. Since thats not the case the first rule MUST be wrong. We simply didnt find the source yet. But i would consider to investigate electrons or rotation lines of planets. They never stop moving even with obstacles in their ways. (stones light for planets, other electrons and forcefields like gravity for electrones). To answer why they keep moving forever might answer this question.
Just another Starco shipper
Physics makes life boring...
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Does time exist? - Andrew Why don't perpetual motion machines 1 day ago   05:16

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The earliest time measurements were observations of cycles of the natural world, using patterns of changes from day to night and season to season to build calendars. More precise time-keeping eventually came along to put time in more convenient boxes. But what exactly are we measuring? Andrew Zimmerman Jones contemplates whether time is something that physically exists or is just in our heads.

Lesson by Andrew Zimmerman Jones, directed by Nice Shoes.

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