Monday, September 20, 2010

projectile motion in bowling


I noticed that bowling balls go through projectile motion when I went bowling this weekend.  It does not matter if you toss the ball in the air or if you just use horizontal velocity, the bowling ball still goes through projectile motion.  While in the air the bowling ball will maintain the same horizontal velocity (disregarding air resistance) and its vertical velocity will have a negative acceleration of -9.8 m/s/s.  The bowling ball is only in the air for a short moment because I do not release the ball at a high distance or at a large positive angle.  The ball is in the air for a moment, follows projectile motion, then lands on the lane, and heads for the pins.  Strike!

Monday, September 6, 2010

football



This weekend I played a football game against Damien. I experienced changes in velocity, acceleration, distance traveled , and displacement.  Before the play starts I am standing still with a velocity, acceleration, distance traveled, and displacement all with values of zero.  Once the play starts I begin to move forward with a positive acceleration and velocity.  As I stutter my feet to make a cut, I have negative acceleration and my velocity decreases.  I begin to run again with positive acceleration and my velocity increases.  After I catch the ball I continue to run slightly gaining positive acceleration and increase of velocity.  Once I am hit by a defender, I have negative acceleration and my velocity decreases to zero.  After that play is over, my distance traveled and displacement are positive values.  Throughout that play I demonstrated physics through changes in velocity and acceleration,  positive distance traveled, and  positive displacement.