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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 wheeled buffalo figurine—probably a children's toy—from Magna Graecia in archaic Greece [1]. Several organisms are capable of rolling locomotion. However, true wheels and propellers—despite their utility in human vehicles—do not play a significant role in the movement of living things (with the exception of the corkscrew-like flagella of many prokaryotes).
Propeller walk (also known as propeller effect, wheeling effect, paddle wheel effect, asymmetric thrust, asymmetric blade effect, transverse thrust, prop walk) is the term for a propeller's tendency to rotate about a vertical axis (also known as yaw motion). The rotation is in addition to the forward or backward acceleration.
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)
A varial flip is a type of skateboarding trick in which the skateboard rotates around its vertical axis, or its vertical axis and its horizontal axis simultaneously. The first flip trick, called a kickflip but originally known as a "magic flip", was invented by professional skateboarder Rodney Mullen.
Shove-it: A trick where the front foot stays in one spot while the back foot pushes the raised tail to spin around the front 180 degrees or more without spinning the body. Smith grind: A rear truck grind, with the nose hanging below and pointed slightly away from the obstacle. Switch stance: Riding the board with the opposite footing than usual ...
“Outbreaks of hand, foot and mouth disease are common, so being aware of cases in schools, day cares and other child care settings will allow child care providers to be alert to signs and ...
Knee Spin - A spin on one or both knees, normally usually in the kneeling position. Breakers often perform freezes or stylish movements of the upper body while spinning. Chair Kneespin - A spin on one knee and bringing the right or left foot in front of the non spinning knee ankle of the non spinning foot is placed usually in front of spinning ...