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  2. Wagon-wheel effect - Wikipedia

    en.wikipedia.org/wiki/Wagon-wheel_effect

    The wagon-wheel effect (alternatively called stagecoach-wheel effect) is an optical illusion in which a spoked wheel appears to rotate differently from its true rotation. The wheel can appear to rotate more slowly than the true rotation, it can appear stationary, or it can appear to rotate in the opposite direction from the true rotation ...

  3. Stroboscopic effect - Wikipedia

    en.wikipedia.org/wiki/Stroboscopic_effect

    Stroboscopic effect is one of the particular temporal light artefacts. In common lighting applications, the stroboscopic effect is an unwanted effect which may become visible if a person is looking at a moving or rotating object which is illuminated by a time-modulated light source.

  4. Magnus effect - Wikipedia

    en.wikipedia.org/wiki/Magnus_effect

    The Magnus effect is a phenomenon that occurs when a spinning object is moving through a fluid. A lift force acts on the spinning object and its path may be deflected in a manner not present when it is not spinning. The strength and direction of the Magnus effect is dependent on the speed and direction of the rotation of the object.

  5. Wheelspin - Wikipedia

    en.wikipedia.org/wiki/Wheelspin

    Wheels can also lose traction when surface conditions reduce available traction such as on snow and ice. As an open differential delivers only enough torque to cause the "weakest" wheel to spin, if one drive wheel is stationary on a low traction surface (mud, ice, etc.), the deliverable torque is limited to the traction available on it.

  6. Bicycle and motorcycle dynamics - Wikipedia

    en.wikipedia.org/wiki/Bicycle_and_motorcycle...

    While performing a track stand, the rider can keep the line between the two contact patches under the combined center of mass by steering the front wheel to one side or the other and then moving forward and backward slightly to move the front contact patch from side to side as necessary. Forward motion can be generated simply by pedaling.

  7. 9 misprints that are worth a ton of money. Do you have a copy?

    www.aol.com/news/2010-05-03-9-misprints-that-are...

    This makes them extraordinarily appealing to collectors, who want to own the very first copies of a work, says Vasilis Terpsopoulos, manager of the rare book department at New York City's Strand ...

  8. Ferris wheel riders left upside-down after malfunction at ...

    www.aol.com/ferris-wheel-riders-left-upside...

    Footage captures the moment fairgoers in Florida were stuck upside-down on a Ferris wheel ride that malfunctioned. The attraction, which features enclosed carriages that swing and flip, slowed ...

  9. Reverse motion - Wikipedia

    en.wikipedia.org/wiki/Reverse_motion

    The first is not an in-camera effect, but is achieved by printing the film backwards in an optical printer, starting from the final frame and working to the initial one. (This requires a true optical effect, since simply playing the film in reverse when exposing it onto a new negative causes it to come out upside down.) [11] [12]

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