Saturday, October 20, 2012

Jeffery Shen's reflection about the projectile motion

  Through learning projectile,and relative velocity I found out that I can solve more real life problems. This is the glamour of physics has brought to me.

  I learned about all the formulas such as the : d=Vi*t+1/2at^2,Vf^2=Vi^2+2ad
  Those formulas helped me to answer questions but most importantly, they helped me developing my logic, and my rational thinking. projectile motion is associated with various kinds of sports.

  An interesting thing is that the famous angry birds game is based on projectile motion. Birds being launched from a slingshot and crash on the pigs. It is so unbelievable and wonderful that people can use physics knowledge to create so much fun games!



  Relative velocity is associated with many kinds of transportation. When air-planes experience wind, the captain must adjust his plane so his plane is still on course. For navigation, the captain of the ship or boat must aim for the right angle in order to get to the point on the shore when there is a current. 

  What I found difficult about was the addition of vectors. If i added the vectors wrong then my whole question is wrong. So my study and review is mainly on get vector addition correctly.
On the other hand, the problems we are doing now are all air friction less.  If there is air friction, the height and range of the projectile travels will be  shorter and lesser. Projectile motion is relatively simple, so i don't have other problems.

  my problem solving skills improved dramatically. my logic is developed. For example, I became more comfortable with performing calculations and write out multiple steps. I learned how to use multiple formulas and steps to get my final answer. I became more proficient at drawing diagrams.In conclusion, every aspect of my problem solving skills just got better.

  Through studying projectile motion, I learned to break the horizontal and vertical motion up into two vector components.Not as in physics 11, I just simply plug in numbers into formulas and hoping to get the result. We call the horizontal component the Vx, the vertical component the Vy. Since all the problems we are doing right now are air friction-less, the Vx component does not have any acceleration. The velocity is constant for the horizontal motion. So we can ignore the 1/2*(-9.8m/s^2)t^2 part, and the formula is Vx=Vi*t. for the vertical part, if the projectile is thrown horizontally, then we can ignore the Vi part because its initial velocity is 0. if it is thrown at an angle then we just need to use cosine and find the Vyi.

  Overall, through studying the projectile motion unit, I learned that now I should not just do the problem in a simple step, I shall consider to break problems apart and solve them separately. It applies to life too, when encountering problems, i shall not expect to them right away. I shall consider the problem, plan the methods. If the problem is complex I shall consider solving them by a step by step manner, not expecting to get the answer right away.
This is a creative projectile motion video


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