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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 ...
A G-Turn is a Nose Manual, but without facing the riding direction. The rider increases speed, then places the front foot on the nose while keeping the back foot over the back wheels. While riding, the board tends to turn frontside or backside, ending with a spin. Variations: One-Wheeled, Backward, Hang Ten (two feet on the nose)
Its shape is similar to that of a Ferris wheel, but with seats that are enclosed and rock and roll as the ride rotates. If the rocking builds sufficient momentum, the seats will flip upside-down and roll end-over-end. There is usually a manual hand wheel inside that the riders can use to lock the seat and prevent it from rocking.
The turn is achieved by transferring the momentum of the car by reversing quickly in a straight line then turning the wheel sharply while using a brake to lock the front wheels. The driver changes into a forward gear as the nose comes about. [2]
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To apply the right-hand rule, place one's loosely clenched right hand above the object with the thumb pointing in the direction one wants the screw, nut, bolt, or cap ultimately to move, and the curl of the fingers, from the palm to the tips, will indicate in which way one needs to turn the screw, nut, bolt or cap to achieve the desired result.
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 ...
A roller coaster inversion is a roller coaster element in which the track turns riders upside-down and then returns them to an upright position. Early forms of inversions were circular in nature and date back to 1848 on the Centrifugal railway in Paris. These vertical loops produced massive g-force that was often dangerous to riders.