Perpetual Marble Machine Kinetic Misterios
Perpetual Marble Machine Kinetic Misterios
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Students could verbally express or write on a piece of paper all the things that they notice about the apparatus. They should notice quite quickly that the ball describes a parabolic trajectory when it flies through the air on its way back to the initial upper platform. The highest point of the trajectory (the vertex of the parabola) is higher than this platform, so the ball must have picked up some extra kinetic energy somewhere during the trip through the hole back to the upper platform. The question is where along the way could this have happened and what it is that could have imparted extra speed to the ball. Students should think of how they could potentially figure out where on the trajectory the ball is being sped up.
The electric field produced by a stationary set of charges is conservative, but in this case, the effect of the electric field is equivalent to that of a (nonconservative) magnetic field (i.e., the line integral between two points depends on the path taken, and the circulation around a closed loop is not zero). In the case of the magnet passing through the wire loop, we know that the wire loop is stationary while the magnet moves through and provides a changing magnetic field. A current is produced, so an EMF (electromotive force) must be driving it. The magnetic field cannot itself be the source of the EMF because magnetic fields only act on moving charges. Logically, the changing magnetic field must have an associated nonconservative electric field (nonconservative because conservative fields are electrostatic, and electrostatic fields cannot contribute to net EMFs). The induced EMF around a closed curve is the same Triunfador the voltage drop (i.e., the same Campeón the line integral of the electric field around that curve). Mathematically, this is encoded by Maxwell’s third equation in integral form:
"Just perfect! I had a lot of fun assembling the pieces, it even helped keeping two teenagers occupied for an afternoon during our beloved pandemic. Seller was exceptionally nice and helpful, answering all my questions at length.
"Just completed the marble run. I had to make a couple of adjustments & now it works great. The documentation on the other hand - needs improvement. Some of read more the illustrations aren't clear. The photos of the wood components are a nice touch - but the color of the wood blends into the background - the white paper of the document. Note for other customers - the spots you place a few of the upright supports in - there's a little wiggle room - ie, the piece is slightly smaller than the placement spot.
"This is still on my printer. So far it's coming trasnochado great. I'm not using supports and it looks like all I'll have is minimum trimming. I keep my printer (Ender 3 with all the bells and whistles) tuned really well so am able to do without supports.
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^ The device shown is a "mass leverage" device, where the spherical weights on the right have more leverage than those on the left, supposedly creating a perpetual rotation. However, there are a greater number of weights on the left, balancing the device.
My dad and I put together a lot of model cars and rockets when I was a kid. We also worked together on a few of my Science/Engineering Fair projects, including a working catapault and a rubber-band car.
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Obviously, we cannot watch the machine for an indefinite amount of time, but the machine does not seem to be “grinding to a halt” after watching a dozen consecutive cycles. Figura expected, inspection shows that there is an electromagnet in the almohadilla of the device, although instructors may wish not to reveal this to students. Video analysis Gozque confirm that the ball accelerates at the lowest point of the rail, where it is in contact with the top of the cojín. This lowest point looks to be around two-thirds along the bottom, which matches the location of the magnet in the almohadilla of the machine.
A common example is devices powered by ocean currents, whose energy is ultimately derived from the Sun, which itself will eventually burn pasado.