Today we started the class by check and go over the homework on Friday page 189 # 1 - 8. Then we watched a video on YouTube called "crazy insane water slide". After that we took notes "gravitational potential gravity".
Notes:
- Energy due to gravitational position. U = mgh (sometimes use y instead of h).
- where U is potential energy. m is mass and g is acceleration due to gravity (9.8 m/s^2), h is the height above a reference point (usually the ground). Unit of U is Joules (J)
The teacher gave example of reference point using Jacob's head and a brick.
There is one more equation was : Ei = Ef or Ui + Ki = Uf + Kf. where U is the potential energy and K is the kinetic energy. I'm not really understand this concept, so I can't explain it.
After that we did 2 examples in the example sheet from Friday
and finally was the pair check.
Homework: Finish the pair check, page 189 #12 - 18 in the text book, Lab manual page 111 - 113 (due Friday)
The problems in "crazy insane water slide" is that the person's speed not enough energy to reach the pool because he slide a long distance on a level surface, which reduce the speed.
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