Sunday, December 6, 2009

Inertia: The Resistance

Part A:

I learned about Newton's First Law pertaining to the first condition for equilibrium. This refers to objects that are in translational equilibrium. When an object is in translational equilibrium, the sum of the forces acting on it, ∑Fx and ∑Fy, are equal to zero. With this knowledge, I was able to solve problems involving objects in translational equilibrium. I also learned to draw more thorough free-body-diagrams (FBDs) to help me work out the problems more easily. Some examples of things to solve would be the magnitude of tension forces or friction.

What I have found difficult about what I have studied is drawing the FBDs correctly. It is sometimes frustrating to find where to put theta, ø, on the FBD. Sometimes you need to use its complement whereas other times you don't. I also find it difficult when the system is on an inclined plane because this also confuses me over where ø is located. are only difficult when the supports aren't at the ends of the beam.

My problem solving skills are up to par, in my opinion. I am able to identify how to solve the problem whenever necessary. I plot my information in an organized fashion and use it accordingly. I put an effort into every problem that I work, looking at it in every perspective until it is solved. I feel that my strengths outweigh my weaknesses. I know when to use the equations ∑Fx=0 and ∑Fy=0. I also know when I need to use substitution in algebra. I manage to draw proper FBDs when they are needed. My weaknesses are minor. Perhaps a small mistake in algebra, which is rare. I may have to think about where to put ø on an FBD when the system is on an inclined plane, as well. In essence, my problem solving skills are whee I think they should be.

Part B:

What we have studied in class is very relevant in the real world. For example, Newtons first law is important when it comes to hanging stop lights from cables. They need to equate whether the cable will snap under the weight of the light or not. This is also extremely important when it comes to building bridges. There are always cars on the bridge, will it be in translational equilibrium? There are equations to find out. In architecture, including houses, it is necessary to know if the roof will be supported. It could collapse if it is too heavy, so it is necessary to have enough support below it. All of these examples are just a few from the many application in which Newton's First Law is used. Check out my glog that demonstrates these examples, below!

Inertia Glog


  1. Oh my, this is so good! I don't think that there are any changes necessary at all! You are so bright and well spoken. Well done!

  2. Thanks so much for your flattering comments. Thanks for taking some time out of your life to read my reflection!

  3. good blog on the inclined plane it helps if you rotate the grid so one axis is in line with the motion making it so less angles need to be calculated.

  4. That's true, as long as everything stays parallel.