Free energy from gravitation using Newtonian Physic

[Evil Roy Slade]

For example: say you have two pendulums side by side that drop .051 meters, both pendulum bobs are moving 1 m/sec at the bottom. Suppose you devise a way of giving all the motion to one of the two bobs, the bob in motion will not rise .102 meters, it will rise .2038 m. You have doubled the energy. d = 1/2v?/a

This analogy is wrong. Yes in a perfect enviroment the bob in motion would reach .2038m...double the original height. However there is only ONE bob now at the high point, ie HALF the original mass so the potential energy at this point is EXACTLY the same as the kinetic energy at the low point when one of the bobs magically passes its energy to the other one. End result is ZERO change on total energy.

[hansvonlieven]

G'day all,

The kid on the swing changes the center of gravity in relation to the fulcrum when it leans back. This shift requires energy.

If this shift in gravity is in a harmonic relationship with the natural frequency of the pendulum (swing) as far as timing and direction goes, this energy gets imparted to the pendulum.

Simple as this

Hans von Lieven

[supersam]

Hans and @ everyone,

the kid on the swing, will have a real hard time getting any momentum to accelerate, if he/she doesn't have arms and hands, that effectively, with energy, shorten the distance from the fulcrum.  thus providing additional accelration that coresponds to more height.  not applicable.  just jmho.

lol
sam

[Evil Roy Slade]

The kid inputs energy into the 'pendulum' swing through his arms and bum.
Have you ever seen a swing with rigid supports instead of flexible rope or chain?.
No, because that would eliminate the energy transfer mechanism.

[hansvonlieven]

Pasted from an elementary physics site:



Let's talk about playing swing again. As the child grows up, he won't be satisfied with the push and will want to learn how to play swing by himself. Please refer to Fig. 2, the broken line represents the route of the centre of mass of the child. Why can he swing with an increasing amplitude? When the boy swings to point A, he rises his body. Assuming that he rises his centre of mass by a distance  and the tension of the rope is , he does a positive work which supplies an energy of into the system. When the boy swings to point B, he letdowns his body to lower his centre of mass. This time he does a negative work. If the tension of the rope is , then the system loses  of energy. When the boy is at point B, his velocity is zero, so  is just the vertical component of his weight (, see Fig. 3). But when he is at point A, his velocity is the greatest, and the difference between the tension and his weight equals the centripetal force (). Hence we conclude that . Therefore, his positive work is greater than the negative one and energy is fed to the swing. If he supplies energy rhythmically, just like his father's push, resonance is produced and the boy swings with an increasing amplitude.

Hans von Lieven