Sunday 2 August 2015

Physics of Skateboarding: Ollie

What is an Ollie?

  • An ollie is another basic trick for skateboarders to open up the gates of doing other harder tricks such as frontslide 180, pop shove it, heel flip, kickflip, and others. This trick is a jumping technique for the skateboarders to jump over a curb, a crack or other obstacles. 
How to do a stationary Ollie?
  1. Stand on the board. The weight (acting downwards) of the skateboarder, the weight (acting downwards) of the board and the ground's force (acting upwards) should all balanced out to zero.
  2. The skateboarder will have to crouch down to get a lower center of mass (to jump higher) when apply a greater downwards force on the tail of the board than the nose of the board. This causes the board to pivot counterclockwise at the back wheel. 
  3. When the tail of the board hits the ground, the ground automatically exerts a greater upward force causing the board to fly upwards as the board bounces off the ground. At this moment, the board now pivots clockwise around the center of mass of the board itself.
  4. The board is now completely in the air. The skateboarder will have to slide their front foot forward to drag the board even higher. This happens because of the skateboarder's foot produces friction (grip-tape) when sliding their foot forward.
  5. To level out the board, the skateboarder will have to push board down with their front foot while the other foot rises to prevent from adding other forces. This motion makes the board seem "stuck" to the skateboarder's feet.
  6. When the board is leveled, gravity will pull both skateboarder and board downwards - landing on the ground. To prevent any injuries, the skateboarder will have to bend their legs to absorb the impact of the landing.
Picture of how an ollie looks like.

Sources used:

http://www.exploratorium.edu/skateboarding/trick02.html

https://www.youtube.com/watch?v=vLrsMflKaDw

https://www.youtube.com/watch?v=C2GN8K0jw1E

google pictures

by: A'

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