## Tuesday, December 7, 2010

### What do Mμ know? Newton's Laws!!!

What do mμ know? Well that is the wrong question to ask because this is about what I know. I learned so much about Newton's Laws. The book states "An object at rest tends to stay at rest and an object in motion tends to stay in motion blahblahblah...", I had no clue what we were learning. But then, we began with the problems, and I started to learn about this thingy called Inertia.

NEWTON'S FIRST LAW:

We started off with the easy stuff like Fg=mg,  ΣFx=0 and ΣFy=0, and "mickey mouse" problems like that. Then we applied that to normal force, then we found the net force, and I thought it was easy. But it got a little bit harder, but a lot more interesting. I learned how to apply these small equations to trigonometry and I was then able to find other forces such as tension. Starting off with the translational Equilibrium Equations,  ΣFx=0 and  ΣFy=0, combined with a FBD, I could use the small equations that we learned to find the missing force in an equation. If I was told that a block was hanging by two cords, the block was 50 Newtons, and the angles of the cords were 60 degrees, I could easily find the tension in the cords. Then, we had problems that had more forces such as friction and force applied. We used the FBD's to clarify these problems, we applied  ΣFx=0 and ΣFy=0, and after many calculations, we found the missing force. And though the problems slowly got harder and harder, I was able to apply all of the small concepts that we learned and trigonometry to find the missing variable. I learned a TON about the first law. And I was told that this was the hardest law, I was able to wipe the sweat off my head. I learned many things about Inertia and his first law, I had all of the forces down, and was ready to move on to the next law.

NEWTON'S SECOND LAW:

NEWTON'S THIRD LAW:
Newton's third law was short and sweet. The book states that "when one object exerts a force on another object, the second object exerts on the first an equal force in opposite direction." So in an easier way, if the head hits the wall, the wall hits the head. (Hopefully nobody is hitting a wall with their head, it is just an example). So all in all, it was just an action force has a reaction force.

What I have found difficult about Newton's Laws is very simple. I know all of the laws, I know how all of them work, and I can get most of the problems. I just don't know exactly when to apply some of the rules. I find it difficult to know when to use certain net force equations. I usually get it right, but sometimes I am a little bit "iffy". The last thing that I had difficulties with some of the angles on the tension problems in the first law. Sometimes I don't know which axis to draw my x component and y component to, sometimes I draw the right triangle with the y-axis, and sometimes with the x-axis. I don't know if one is right or if they are both but that is what I found difficult. I got most of the stuff and understand it well, but just these two little things were confusing

The laws of motion have really upped my level of thinking. My problem skills have gotten SO much better. I really put a lot of effort into trying to understand everything in the first place. Getting the simple FBD'S was pretty easy, but then applying them to the problems was the hard part. After applying them to the problems, I felt that my strengths were finding ways to get to the final answer. For example, some FBD's might not give you enough information so that you can cruise through the problem. On these harder problems, my strength was that I was able to find my way to the end. I was able to plan ahead and see that a certain variable was going to cancel out, which would then make the problem much easier. It is very hard to explain in words, but it was just simply my thought process was my biggest strength. I gave a very good effort with all of the laws and tried as hard as I could, and other than making complicated FBD's with angles, I got pretty much everything and understood it well.

All in all, THIS UNIT WAS AWESOME!!!

1. Your reflection is excellent, very thorough and clearly explained.
Please remove any mentions of my name as it is out of context. The objective of reflections (and all of our blog postings) is not to talk about the teacher but about your learning process. For example, you could say: "in class we learned how to highlight the direction of ..."
Remember that you have an audience not just your teacher!
Is there a way that you can format your posting so that the words are not cut at the end of the column?
Great job!!

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