Today in class we learned all about energy. I posted a picture of powerade because it is energy drink and represents energy. There is a picture of a person running to represent kinetic energy, energy of motion. There are pictures of a spring and a rubberband because those are sometimes involved in problems involving energy like spring potential energy problems. Law of conservation of energy- energy cannot be created or destroyed it only changes form. Energy is a scalar, meaning it only has magnitude not direction .
We learned about 3 different types of energy:
Kinetic= energy of motion (KE= 1/2 x mass x (velocity)2 = 1/2m(v)2
Potential (gravitational) energy (PEg= mass x gravity x change in height = mgh
Spring potential energy (PEs= 1/2 x spring constant x (distance the sprig is stretched or compressed)2 = PEs= 1/2k(d)2
Hooke's Law (Fspring= - kd)
Work= change in energy
W- force x distance (N•M or Joule)
We also learned some graphing rules
1) The area under a curve of a force vs. distance graph is work done
2) The slope of a force vs. distance graph is spring constant.
We completed a bunch of problems all about energy and for all of them we had to use the equations above ^^^ we also used the equations: work=change in PEg and work= change in KE. This problems are pretty simple, once you figure out which type of energy is present in the problem.
Great post Candace. It was a really good refresher for class. Nice picture examples too!
ReplyDeleteGood job summarizing class :) I like how the pictures also represent what you said.
ReplyDeletegood post candace, i could skip a day of class and just read this and i think that i could get by. good job with adding all of the pictures, keep up the good work.
ReplyDeleteVery good post on what we learned in class on Unit 8! It shows you put a lot of time and effort into your blog post work.
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