Running shoe

• In the sports world, athletic equipment are always researching for new advances in technology an physiology to improte the effectiveness of their products, as well as the safety of the athlete using them, Just like the running shoe…

The development

• In only a few decades, the running shoe has changed from a simple sneaker to a sophisticated aerodynamic, foot-protecting performance necessity.

• It has development in facts like the placement and alignment of the body, as well as the foot itself, and the increasing of choreographic demands, such as different movements from the foot inside the shoe.

• Innovation of technology, safety and aesthetic perfection has been developed for years so the effectiveness of the running shoe is higher.

3 stages of the running shoe

• Neutral: This is where the heel of the runner makes contactwith the ground and the foot travels in a straight line as itmoves forward.

• Pronation: This where the heel hits the ground but this time the foot moves to the side as it travels forward. It refers to theinward roll of the foot.

• Supenation: This is where the heel hits the ground and thefoot rolls outward.

Types of shoes..

• Friction between the surface and bottom of the shoes is important if the runner wants togo anywhere.

• For surfaces like sidewalks, roads, and rockyareas the bottom of running shoes should be flat as there would be enough frictionbetween the shoe and ground for not slipping.

• The bottom of the shoe should also be flat because the surface area contact is larger.

What happens when you slip?

• Slipping results in thermal energy instead ofgoing towards movement as the followingequation implies:

• W = F*d*cosθ

where W iswork F is theforce

θ is the angle between F and d

Also in grassysituations..

• Concerning to friction, the bottom of a running shoe may be flat for a track surface or spiked for a grassy surface.

• The point here is to keep the shoe from slipping on the ground. Energy = force x distance, so if your foot slips, you've lost energy through that distance of slipping.

• A spiked shoe is good for the grass because once the spike drives into the ground, there are not only frictional forces involved but also normal forces between the spike's surface and the dirt pushing against the spikes.

• Normal forces tend to be a lot more effective than frictional forces in stopping movement.

• Since the friction coefficient of thematerial inside is not changing, thehigher normal force will cause anincrease in the maximum static frictionforce and will help keep the foot fromslipping.

Running shoe development…

1900

1930

1950

1980

2000

2014