changing a tire

this past week when i was driving home from school i experienced a very unpleasant circumstance.  When i was only about five minutes from my home i stumbled upon a very sharp nail which punctured a hole in my front right tire.  i thought to myself, "i dont know how to change a tire...what am i going to do?"  That is when i called my dad.  He was there in no time and he showed me how to change the tire.  he explained first where to retrieve the car jack from and then he went on to explain how to use this strange contraption.  the jack consisted of a lever and the part that lifts up the car.  he went on to lift the jack but the car was very heavy and he was having some difficulty.  This is when i became the teacher, i used the knowledge i had gained during the day of school in physics class to help him.  we had learned that the perpendicular force*radius is equal to the torque so i told him that if he pushed further from the turning point then it would apply more torque and it worked.  i also told him that the same idea applied to the wrench that you use to remove the bolts holding the tire on.  We finished changing the tire in no time and by the end of it me and my dad had both learned something new that day.

tetherball

i remember back in the day when i attended Kahala Elementary school, we used to play tetherball everyday at recess.  i never really understood the whole physics behind tetherball until we learned it this past week in physics class.  all i remember was hitting the ball around the pole really hard.  this past week i learned that the ball swings in a conical pendulum the same way the airplane flew around on the string and how the pig was supposed to fly.  when the object flies in this way it is called a horizontal circle, although the circle is never completely horizontal.  i learned also that there is two types of velocity, linear and angular, both are completely separate and cannot be mistaken for the other.