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Author Topic: Can energy double?  (Read 16474 times)

Rapadura

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Re: Can energy double?
« Reply #15 on: April 28, 2010, 01:16:38 PM »

Can energy triple?

Rapadura

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Re: Can energy double?
« Reply #16 on: April 28, 2010, 01:19:26 PM »
It's obvious that a ball that falls pulling a car will fall with much less speed than if it was falling freely, without pulling anything.

With less speed, kinetic energy is less. The kinetic energy will just be "shared" between the ball and the car.

Zhang Yalin

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Re: Can energy double?
« Reply #17 on: April 29, 2010, 04:25:38 AM »
E=Gh=mgh=1×10×10=100J

Zhang Yalin

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Re: Can energy double?
« Reply #18 on: April 29, 2010, 04:30:46 AM »
The energy can't triple, It'll only increase a few energy less than 20J.

gyulasun

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Re: Can energy double?
« Reply #19 on: April 29, 2010, 09:50:48 AM »
E=Gh=mgh=1×10×10=100J

Hi,   if you mean the above result (100J) is the answer for my earlier question on "How much work should be done to lift the ball up to the same 10m height",  then your previous energy gain of 60J is not enough to return the ball for a restart.  Now what?

Zhang Yalin

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Re: Can energy double?
« Reply #20 on: April 29, 2010, 10:18:53 AM »
80×2-100=60.

gyulasun

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Re: Can energy double?
« Reply #21 on: April 29, 2010, 01:31:39 PM »

  So your resulting gain is 60J  and you need 100J to lift up the ball for repeating the process?

FreeEnergy

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Re: Can energy double?
« Reply #22 on: April 29, 2010, 07:23:43 PM »
a simple test can do done by getting a piece of rope, attach equal weights (one weight should have wheels) to each end of the rope, then wrap the rope around a rotor / axle, then have one end of the rope that goes vertical and the other end horizontally like the graph suggests. just measure the rotor / axle output. if the output of the rotor / axle can pick up the weight of the ball to reset the system then we have perpetual motion.

EDIT -
EDIT -
EDIT - Actually the output should have more than enough strength to also reset the weight with wheels  and not just the ball or it wont work
EDIT -
EDIT -
EDIT -

Zhang Yalin

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Re: Can energy double?
« Reply #23 on: April 30, 2010, 05:22:33 AM »
Oh, No, It can't be changed, or it will not do.

FreeEnergy

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Re: Can energy double?
« Reply #24 on: April 30, 2010, 06:10:58 AM »
what can't be changed?

Zhang Yalin

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Re: Can energy double?
« Reply #25 on: April 30, 2010, 10:09:32 AM »
The device can't be changed, otherwise, 100=100.

Bentoptics

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Re: Can energy double?
« Reply #26 on: April 30, 2010, 03:52:51 PM »
Unfoturnatly if the mass of the car equals the mass of the falling weight
There will be no motion at all. Friction will prevent any movement.
Look over the calculations in the attached file. Note I did not add the
Account of friction that will be present in the pulley guiding the string so
The losses will be higher. I would suggest you to build it and try it out
I think there is a lot to learn from trial and error.

BentOptics

Zhang Yalin

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Re: Can energy double?
« Reply #27 on: May 01, 2010, 04:57:11 AM »
No, you're wrong in the last step.
The ball and the car have the EK(80J) at the end.

FreeEnergy

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Re: Can energy double?
« Reply #28 on: May 01, 2010, 06:28:57 AM »
the weight going horizontally must have wheels...  :)

Zhang Yalin

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Re: Can energy double?
« Reply #29 on: May 01, 2010, 08:58:55 AM »
Of course, it has wheels.