Blog 2

For XC practice last week, we ran to Kapiolani park to play ultimate Frisbee.  While playing, I noticed that at the tennis courts nearby, the players were hitting the ball with their racket.  I also noticed that the  soccer ball was being kicked by the soccer players on the nearby soccer field.  At this moment, I recalled that when the soccer ball is kicked it is like a vector.  Its horizontal velocity was constant throughout it's flight while its vertical velocity made a parabola.  It had a negative acceleration of 9.8 meter per second squared and its vertical velocity, therefore, was decreasing in speed on the way up and increasing in speed on the way down.  At the top of its altitude, or maximum height, its vertical velocity is 0.  This soccer ball reminded me of a great soccer game between Iolani and Millilani for the state finals which took place last year.

Physics Entry #1: XC Meet

On September 4, 2010, I had a cross country meet at Waipio Soccer Park for Iolani School JV/ Varsity.  During the race, I was running at around 3.5 meters per second (from 22 minutes for 3 miles) but when I got to a steep and long hill, my pace slowed even though I was putting in more effort.  The hill was about a 45 degree angle from the ground and approximately 15 meters long.  I came to the top of the hill in about 25 seconds making my pace slow down to .6 m/s.  My velocity slowed down because I ran fighting the force of gravity which is 9.8 meters per second^2 in the negative direction or to the ground.  My legs became especially sore on this hill.  Other runners also slowed down.  This picture isn't a picture of me but of other intermediate runners on their 2 mile event at Waipio.