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Physics Presentation

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by

Aaron Glick

on 22 October 2012

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Transcript of Physics Presentation

Physics Behind BMX History of BMX Origin: there is no exact origin, but it is said to have came about in the early 70's when kids in California and New Jersey were mimicking their motorcycle motocross idles with their modified Schwinn bicycles. Innovation and Evolution It started out as just "bmx"or bicycle motocross, which is the racing around a dirt track like this one. BMX then followed the path of many extreme sports, like skateboarding, and is now an ever changing sport with 5 distinct branches: Racing
Flatland
Freestyle Vert
Freestyle Dirt
Freestyle Street/Park BMX on the Global Stage In 2008 bicycle motocross became an Olympic, and was in the Beijing and London Games. BMX events have also been in the X-games since they were started. Past:
BMX freestyle dirt
BMX freestyle flatland
BMX downhill
BMX vert doubles X-Games BMX Events Present:
BMX freestyle vert
BMX freestyle park
BMX freestyle street
BMX freestyle big air
BMX best trick Physics!! There are many aspects of physics that involve riding a bike like torque, friction, acceleration, momentum, velocity, and even gravity!! BMX uses all of those forces and uses them in different ways to perform tricks and motions that may not have been what bikes were originally supposed to be used for. Simple BMX Tricks The "Bunny Hop"
The Manual
The 180
The Bar Spin
The Tail Whip The Bunny Hop To perform a bunny hop the rider must first pull up and lean back on the handle bars to get the front tire off the ground, do this using FORCE.
Which is F=ma
Then the rider must quickly and fluidly lean forward, shifting their center of gravity, and pull the rear of the bike up with their legs.
Remember during all this time Gravity is working against the rider to pull them back down to earth.
Gravity equals -9.8 meters per second squared. The Manual The manual is pretty much just performing the first step in a bunny hop, but while finding the balance point and holding it to perform the trick.
To do a manual the rider will have to remember to take some factors into account like their body weight, the length of the bike, and their center of gravity to find the balance point.
Again the rider will use force to pull up on the handle bars, and then by "pumping" their legs, and shifting their body weight and center of gravity the rider will be able to find their balance point.
And again all this time gravity will be acting against the rider. The 180 To perform the 180, the rider must first bunny hop, but while beginning the hop they must turn with a slight angle, of about 15 degrees.
Then the rider must continue their bunny hop, while adding torque (T=r x F) into the equation to complete the spin and role back out of the trick. The Bar Spin The Bar Spin like most tricks starts off with a Bunny hop, then while in the air the rider simply throws the handle bars in a full 360 degree spin.
This trick again uses torque, but instead of using torque to spin the whole bike the rider just spins the handle bars.
Again torque is: T= r x F
And again gravity is acting against the rider and gravity is g= -9.8 meters per seconds. The Tail Whip Again the tail whip is a trick performed in the air, so it is easily learned off of a bunny hop. While in the air the rider again spins the bike, but this time the handle bars and the body stay on the same line while the rear wheel and the rest of the bike whip around the handle bars using the stem (which connects the handle bars to the rest of a bike) as a axis which to spin on.
Again this uses torque (T= r x F) to spin the bike in a "Tail Whip motion"
And again gravity is acting against the rider this whole time.
• http://www.columbiabasinbmx.com/index.php?option=com_content&view=article&id=51&Itemid=57
• http://www.stack.com/2008/11/01/the-evolution-of-bmx/
• http://www.bmxtricksnow.com/
• http://www.wikihow.com/Barspin-on-a-BMX
http://library.thinkquest.org/J002670/parts.htm Works Cited
•http://www.youtube.com/watch?feature=player_embedded&v=gIfiSKUBGnw#! Video!!
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