Perpetual motion not possible ?. Answer this!.

[SecurityTheatre]

wow you are so wrong, we can't create energy or destroy it that is the basic physic, we can only transform it, so there are no way we can create infinity energy.

motion is some kind of energy and if there are some friction then some of that motion energy is transformed into heat or something else, and that why in space if you are moving object then the object will move forever because the object can't transfer its energy to something else.

Motion (kinetic energy) is stored energy. You can move indefinitely without any input or output of energy.

When you talk about friction, you're talking about acceleration, just like the OP said.

 

[lord_emperor]

what happened to...
an object in motion will stay in motion, until acted upon by an outside force.

motion does not require energy... only acceleration.

Everything is being acted upon by outside forces.

 

[Mr. Pedantic]

At least according to currently accepted theory that is correct. However, history is riddled with examples of the observable universe obstinately refusing to follow our theories.

And when we find evidence of such phenomena we will address them then. There is nothing to be gained in stubbornly saying our theories may be wrong because it's possible, even though all known observation is explained by them.

 

[pw38]

Well sure there is, you win an argument on teh internets and that's what we're all after, isn't it?

 

[SparkyJJO]

It has not. The Earth once had less than a five hour day, a spinning Moon ten times closer, filling half the sky. Due to the interaction of gravity in orbiting objects , we now have a 24 hour day(getting longer), a tidal locked face of the Moon, also the Moon is slowing down and moving into a higher orbit.

I have never heard of this theory before

 

[wahdangun]

Motion (kinetic energy) is stored energy. You can move indefinitely without any input or output of energy.

When you talk about friction, you're talking about acceleration, just like the OP said.

no, friction is not always causing acceleration.

example when you push the break in your car, the friction between the tire and the road make your car stop, so where the energy that car have before go?

ok the answer is that energy transformed into heat energy.

 

[SecurityTheatre]

no, friction is not always causing acceleration.

example when you push the break in your car, the friction between the tire and the road make your car stop, so where the energy that car have before go?

ok the answer is that energy transformed into heat energy.

The energy is extracted from your velocity (hence, acceleration) and put into heat, yes.

Acceleration means "the change of velocity" and that is what friction (dynamic friction, not static friction) does.

 

[QuantumPion]

Perpetual motion is physically possible. It is perpetual motion machines (i.e., perpetual motion that creates net energy) which are impossible.