How+the+World+Works

Scientific Principle (SPEED) Speed is something that is travling fast. Speed is the reason is the reason that we travle in our cars so quickly. Bikes produce speed Cars produce speed, Any type of vehicle produces speed. Humans have modified speed to use it to our advantage.

** Running Shoes differ to Joggers. **

How have running shoes developed over the years? Running as a sport can be traced back to the ancient Greeks, who advocated a culture based on sound bodies and sound minds. During Greek athletic contests, runners competed barefoot and often naked. Later, the Romans mandated that their messengers wear thin-soled sandals. As shoemaking evolved through the centuries, leather became and remained the favored material because of its durability. However, the first references to shoes designed specifically for running don't appear until 1852, when historians noted a race in which runners wore shoes with spiked soles. In 1900, the first sneaker, or all-purpose athletic shoe, was designed.

What are running shoes made of? Running shoes have three different layers. Every layer is made of something different. The insole is a thin layer of man-made ethylene vinyl acetate. The Midsole consists of polyurethane surrounding another material such as gel or liquid silicone, or polyurethane foam given a special brand name by the manufacturer. In some cases the polyurethane may surround capsules of compressed air. Outsoles are usually made of carbon rubber, which is hard, or blown rubber, a softer type, although manufacturers use an assortment of materials to produce diffrent textures on the outsole.  Why do we use running shoes? Runnings are used for quick sprints and long track events such as 1200m, 800m.  When where running shoes developed? The Running Shoes were developed in 1970’s. By Rob Roy McGregor.

Who developed the running shoes ? Rob Roy McGregor was the first to develop the running shoes he named the shoes Dynamic Heel Cradle

Where did the running shoes begin? The Running Shoes began in Greek where men did sprints in the sandals. The shoes devolved when scientists discovered rubber.

** Past Runners and Present Runners 100m **

** Present... Usain Bolt: 9.58s ** ** Present... Tyson Gay: 9.69s ** ** Present... Asafa Powell: 9.72s ** ** Present... Maurice Greene: 9.79 ** ** Present... Donovan Bailey: 9.84 ** ** Present... Bruny Surin: 9.84 ** ** Present... Leroy Burrell: 9.85 ** ** Present... Justin Gatlin: 9.85 ** ** Present... Olusoji Fasuba: 9.85 **
 * Present... Carl Lewis: 9.86 **



In the normal running stance you put your heel down first that is why I put the springs at the back ( The springs will press down then your toes touch the ground the spikes will grip the ground. Then when your foot leaves the ground you will bounce away with extra speed and bounce. media type="custom" key="9391396" align="right"