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Physics Presentation (February 18, 2011) Forces ATHLETIC SHOES
Transcript of Physics Presentation (February 18, 2011) Forces ATHLETIC SHOES
''real'' inventor of the athletic shoe, because numerous people over time developed different theories that lead to the full development of the athletic shoes we use today. It was a collaboration of millions of different ideas that contributed to the athletic shoe. The Theory Behind Shoes Many shoes are created to accomodate to certain foot types. There are two main concepts developers look at when designing shoes; footstrike and foot position.
Foot strike: when you walk, do you strike heel first, toe first or neutral? Where you strike is where more padding will be to absorb shock.
Position: do your feet pronate, supinate or are they neutral?
PRONATION is when the heel hits the ground and the foot moves towards the inside when it goes forward.
SUPERNATION is when the heel hits the ground and the foot is rolled outwards as it moves forward.
NEUTRAL is when the heel hits the ground and the foot travels in a straight line as it moves forward.
So what type of shoe should YOU have? Shoe developers also take absorption into account. Take bashing your head into a wall. It hurts because the wall does not absorb the force of your head where as if you hit your head against a pillow, it would not hurt. The padding and design of running shoes follows this type of principle. Running shoes are designed with special types of padding (for example, like we talked about earlier, the air bubbles in Nike's shoes!) that can provide cushioning for the feet of runners and also absorb shocks when the feet hit the ground. This provides comfort and no strenuous pain on the feet while running long or short distances. YOU CAN MANIPULATE Fnet=m(a) (NEWTON'S SECOND LAW) TO WORK WITH THIS THEORY. The Physics Behind It You can use the formula for Newton's Second Law. This formula is: Fnet= ma.
This formula can be manipulated into one that represents shock absorption. This formula is: Fnet∆t = mv2 – mv1
This formula can be used to solve for shock absorption by plugging in numbers that are found. How Is This Formula Derived? What does this formula mean? We also move due to the coefficient of friction: µ. This is based on Newton's Third Law: For every action, there is a reaction.
When we walk, we push backwards with our foot and use the back foot to push us forward. How? Friction. When we push against a ground, the ground pushes back causing us to move forward. Try it!
This is why flat shoes are used on tracks (wide base = more friction) and spikes are used on fields (dig into ground for more support and friction).
As discussed earlier, the different types of shoes we use can also relate to the speed that is exerted by the runner. Practical Applications catching a baseball
opening a door
bouncing a ball
punching a wall
jumping on a pogo stick
ATHLETIC SHOES! For example.. Who invented the athletic shoe? The earliest running shoes designed with spikes on the bottom were
developed in the 1890's by a British company called J.W. Foster
and Sons (which are actually now currently known as REEBOK). The founder of the company, Joseph William Foster, had shared a true love for running and wanted to invent a shoe that could increase his speed. This lead to the birth of the spiked running shoe, and has been modified since to accomodate different distances. And.. Rubber heels were invented as contribution to the earliest running shoes. They were created using a process called vulcanisation, which utilized heat to meld rubber and cloth together. These shoes were created to be lightweight, comfortable, and not only that, but did not make any sound when used. They became the commonly known ''sneakers'' and Keds bought the patent and today still continue to sell them to America. Let's not forget.. Air-cushioned shoes were developed in the 1970's by Nike. These types of
shoes were designed to absorb shocks and provide very comfortable cushioning
to the runner's foot. The Nike Air shoe (released in 1979) was the very first shoe
that incorporated the air bubble into the heel of the shoe. ''ABSORPTION'' TRIVIA TIME! 1. What is the equation that can be modified to represent shock absorption?
a) Miss Lozo + Physics = Destiny
b) Acceleration = Delta Velocity / Delta Time
c) Net Force = Mass x Acceleration
d) Tree / Saw = Paper c) Net Force = Mass x Acceleration 2. What are the three types of footing position?
a) front, back, side-to-side.
b) suprinate, pronate, neutral.
c) 1, 2, 3.
d) none of the above. b) suprinate, pronate, neutral. 3. What was the company called back then before now being known as ''Reebok''?
c) Josh Foster's
d) J.W. Foster and Sons d) J.W. Foster and Sons 4. What company invented the first air bubble running shoe?
b) Lady GaGa
d) Asics a) Nike Impact On Environment & Society Running shoes have definitely had a positive impact on the human society these days. Because running shoes have been designed to help and aid runners in such success, they've become huge hits with their different designs, styles, colours, and especially their affects. Some running shoes are designed to trek through long, adventurous trails and therefore, are built with strong bottoms that can withstand different types of land for longer periods of time. Other running shoes are designed for tracks and short distances, therefore running shoes with spikes have been designed to increase durability and speed of a runner. We also have the running shoes made with shock-absorption abilities (air bubbles, shocks, etc.) that can absorb the strenuous activity created when runners hit the ground with their feet in each stride. Famous footwear companies in society have also become more competitive than ever nowadays, constantly experimenting and trying to invent the best and most efficient running shoes to retail to customers that seek out the most successful running shoes. Nike's air bubble shoe Plimsolls (Ked's!) Spikes 5. What does does the impact of a foot hitting the ground relate to without absorption? (it was talked about earlier, if you were paying attention you should know!)
a) Falling off a cliff
b) Jumping as high as you can
c) Smashing your head against a brick wall
d) Throwing a ball c) Smashing your head against a brick wall