What describes a perpetual-motion machine?

Answer 1

A motor that requires no energy input once it is running

Answer 2

According to the second law of thermodynamics, all energy shifts will incur entropy, meaning that something is lost (mostly in the form of heat).

Even if some egg head did manage to create a machine with 100% efficiency and ran on itself for all eternity, it would be useless to us because the second we start drawing energy from it to use, it will slow down to a halt. This is because we are the entropy in this example.

Answer 3

Not according to the second law of thermodynamics.

It is possible to create near perpetual motion by cooling some liquids to near absolute zero where they lose viscosity and can be made to continue to circulate through some apparatus. It isn't technically perpetual motion though, because one still needs to spend energy to keep the liquids at such a low temperature.

Near perpetual motion can also be observed by the Earth, which orbits the Sun, and has been doing so for billions of years and will continue to do so for billions more. It isn't quite perpetual either because, in addition to the several different processes from which the Earth loses energy internally, the interstellar medium creates a tiny amount of friction which is in turn converted into heat, and so the Earth's orbit would eventually decay if the Sun didn't engulf it first in a few billion years when it turns into a red giant.

In the end though, there is no such thing as perpetual motion.

Answer 4

A perpetual motion machine is impossible due to the second law of thermodynamics. This law states in a nutshell, that the disorder of the universe is always increasing. As a full explanation is beyond the scope of this forum, see the links below for more in-depth overview.

Answer 5

If you reduce friction - and similar opposing forces - to zero, an object will keep moving forever. For example, a stone moving around in outer space will continue moving, since it encounters no friction.

If want want is to get a "perpetuum mobile", a machine that creates energy out of nothing, that is generally considered impossible. At the very least, you won't get information here how to make such a thing, since nobody has managed to do it yet. Also, try not to waste too much time on trying to invent one, since your quest will most likely be fruitless.

Answer 6

yes a Pakistani made a car whiuch runs on weight i mean on force of gravity he use gravity as a fule its speed is 120kms basically he use interial forces

Answer 7

No, perpetual motion is prohibited by the laws of thermodynamics.

Answer 8

The earth is in perpetual motion because it is always spinning one its x-axis but its not a machine