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Newton's third law. For the force the magnet exerts on the metal, there must be an equal an opposite force on the magnet exerted by the metal. Since both form one system (metal + truck + magnet), the net force on the system is zero, and it won't move.

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Reading in the disclaimer section: The authors of this website are not responsible for ridicule, which can cause yourself by an effort to reproduce the devices described here. The authors of this website are not responsible for the time you may waste reading this website. They are also not responsible for the time you may waste by trying ...

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As Wikipedia clearly lays out, the concept of a free energy generator - a machine that will perform work on external systems eternally and without needing external intervention - is inconsistent with either the first or the second law of thermodynamics. There exist, as yet, no credible and reproducible experiments that shed any type of doubt on either of ...

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You should read the (rather funny) disclaimer on that site: This website presents a serious risk of damaging your self-confidence in case you decide to take any content of this website seriously and try unsuccesfully to utilize it any usefull way. "Free energy" is not possible due to energy conservation.

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It is incorrect to state that The magnet is only braked by the friction of the axis and the air. It is not clear to me exactly what you're proposing, but whenever you deliver electrical energy to some external system you will slow down the rotation of the coil. This is usually through an inductive torque caused on the rotating coil by the currents that ...

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If you are able to reduce friction to a minimum, but not to zero, may be able to run your machine for a long time, but not perpetually. Any energy loss must eventually be offset by the introduction of extra energy into the system. If you're really interested in running forever, there's no such thing as an insignificant energy loss.

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I have an old pendulum clock that needs winding every week. Winding involves raising a block of iron weighing a few kilograms through a distance of about a metre. In no way is this a perpetual motion machine.

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There is no such thing as a physical quantity that is small or large in an absolute sense. Quantities can only be small or large compared to other quantities. Furthermore, comparisons must be between quantities with the same physical dimensions (which can be unitless). For example, sometimes a velocity is much less than the speed of light: $v \ll c$, or ...

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