Rod Refraction

The rod pictured is not physically bent, but it appears to bend because of the physics principal of refraction, which is the distortion of light waves as they move from one medium to another. Refraction can be categorized with the index of refraction, represented by n.

So, how does refraction create the optical illusion of the bent cleaning rod? Well, as explained earlier, refraction occurs when light goes from one medium to another, in this case from air to water. The light goes from a medium in which it moves fast, the air (n=1), to a medium in which it slows down, the water (n=1.33). As the light enters the denser medium with a higher index of refraction it bend towards the normal (the perpendicular line originating from the spot that the pool rod touches the water. However, I have just said that the light ways bend towards that normal and it looks as if the pool rod is bending away from the normal line, how can both the picture and my statements be true? It is because the appearance of the rod is opposite the direction of travel of light going into the water. As the light enters the water the rays bend towards normal but as the ray exits it bends away from the normal and travels toward your eye at a "lower" angle than the angle that it would approach your eye if the light travelled in a straight line.

Einstein quote reflection

"There are only two ways to live your life. 
One is as though nothing is a miracle.  The other is as though everything is a miracle."

Of the numerous quotations and sayings of Einstein, this is perhaps the most famous and influential. This may be because it is indicative of the human condition and because it so genuinely expresses the contrast between optimism and pessimism. Einstein points out one of the greatest internal conflicts that humans face almost every day in their decisions. This decision is how they decide where to place their mind-set and goals, as well as creating and building hope and determination for a brighter future, and a longer, happier life.

If you look at life, it is truly precious.  To look at life in a negative fashion causes no good things. People only have one life to live, and why should they waste time brooding on the negative aspects of it. People sometimes don’t realize that they have “one life” and each day should be spent wisely. Einstein is trying to tell people that you have to “enjoy the little things” to truly achieve happiness. He is saying that is you treat every small occurrence and victory as something truly great, you will learn to appreciate the big things even more while also increasing your overall vigor and spirit.

            Einstein was not only a physicist; he was a great philosopher as well.  Einstein is overlooked usually as just one of the most brilliant minds of the 20^th century. His personality was very deep and people can learn a great deal from his sayings and work. Einstein was the “whole package.” He was able to break barriers in the scientific and mathematical worlds, as well as create life lessons that can change people’s minds and attitudes in a positive direction.

"Imagination is more important than knowledge.
Knowledge is limited. Imagination encircles the world."


Though Einstein said many influential things that have been recorded in history, this quote is one of his most well known and it is one that I think puts in perspective the importance of being yourself and being a free thinker. In this quote einstein is basically saying that if you are creative and inquisitive knowledge will come along with it. He is basically trying to say that though knowledge is important, it is less important than boundless creativity and imagination.What he is really saying is that our knowledge is limited, and that Imagination is the key to unlocking limitless knowledge.

Momentum team project

In the glog my Team and I created we showed how Physics related to bobsledding. We diplayed how conservation of energy and conservation of momentum affect bobsleigh and we displayed vector diagrmas to further explain how these concepts apply.

Team 2 Digital tool

Reflection: conservation of energy

Part A:

This unit we learned about the conservation of energy. We learned that energy is a conserved substance like quantity with the ability to produce change. I also learned that energy can be moved around and stored in different ways but energy itself is unchanged. Energy does not exist in different forms, it is just stored in different ways. While there are not different types of energy, energy is distinguished by the mechanism that is used to store it, such as kinetic, elastic, gravitational potential, and chemical potential. Each of these is not a different type of energy, just a different method for storing energy. As energy is transferred from one method of storage to another, the total amount of energy remains unchanged (this is conservation of energy). energy can be transferred in or out of a physical system in there ways, working (energy is transferred by forces that cause displacements), heating (temperature differences between a system and its surroundings cause energy to be transferred from the warmer object to the cooler object), and radiation (matter loses energy as it emits electromagnetic radiation and gains energy as it absorbs it). I also learned how to represent the transfer of energy with an energy conservation bar diagram. We used bar graphs to represent the initial and final energies and an energy flow diagram to represent what happens during the process of transferring energy. I also learned about work, which is the amount of change that a force produces when it acts on a body. Work is a scalar quantity and its unit is the joule. The rate at which work is done by a force is called power and the unit of power is watts. Power is also equal to the force multiplied by the velocity. After learning the amount of change that a force produces and the rate of that change, I learned about some different transfer methods of energy, namely kinetic energy, potential energy, and elastic potential energy. Kinetic energy is the energy a body has by virtue of motion and is calculated by dividing the product of the mass and the square of the velocity by 2. The gravitational potential energy of a body is found by the product of the mass of the body, the acceleration due to gravity, and its height above a given reference level. elastic potential energy is potential energy associated with elastic materials and is found with the equation PEe=1/2 k(x*x) in which k is the spring constant and x is the displacement. All these transfer methods of energy can be related with work using the work energy theorem. This Theorem states that the net work done on a body is equal to the change in energy of that body, which basically means that Work=change in KE=change in PE. I could then use all these equations to solve problems in which I was given portions of any equation, put them all together and come up with an answer.

The only thing I have found difficult in this unit was when we got into conservation of energy and had problems in which we were figuring out velocity and only being given mass force and displacement. It ocnfused me to come up with the equation for the of the final energy but once I did that I was able to solve the problem much more easily

I feel my problem solving skills have gotten better in this unit, just as they have in units past. The problems we get require us to use critical thinking bacuse not all of them can be approached the same way, and the more practice I have gotten at solving these problems the better my skills have become.


Part B:

The things we learned about conservation of energy are very relevant in real life situations. For example, te physics principles of the conservation of energy are clearly demonstrated in roller coasters. when you are at the top of a ridge in the roller coaster you have x amount of potential energy. When you go down, at the halfway point you have the same amount of energy but now half of it is kinetic and half potential. the instat before the tracks level out and you are almost at ground level, you still have the same amount of energy that you had at the top but now it is all kinetic energy as you are moving (except for a small amount that is internal energy due to friction). Roller coasters clearly show the law of the conservation of energy and demonstarte that energy is only stored in different ways, it does not change forms and is neither created nor destroyed.

physics and Recoil Voki

Get a Voki now!

Dyanmics Application: How is Newton's third law responsible for recoil?

this is a Glog I created to show how recoil is attributed to Newton's third law of Motion. The glog explains why there is recoil and it also talks about why bigger and more powerful guns have more recoil.

edited Dynamics application Glog

N2L and friction reflection

In this unit I learned about Newton's second law of motion and about the force of friction. Newton's second law states the for a particular force, the acceleration of the object is proportional to the net force and inversely proportional to the mass of the object. The direction of the force is the same as that of the acceleration. In equation form this is simply: F=m(a). I learned how to apply the knowledge of the second law to determine mass and value of forces when an object is accelerating. When calculation the sum of the forces for an object that is accelerating just set the sum equal to ma instead of zero. I also learned about apparent weight and discovered that the apparent weight of a body is the force the body exerts on whatever it is resting on. Another thing I learned about is pulley systems and add wood machines. This is where there are two connected objects hung over a pulley, with one possibly resting on a table. I was able to create net force equations for these systems and then find the value of different variable. The final thing I learned about was the force of friction, I learned how to calculate friction and the coefficient of friction (expressed in mu). To solve for variables in these types of problems we used equations from both kinematics and dynamics.

What I have found difficult about what we have studied is the problems containing the coefficient of friction. In these problems you use equations from this unit and the last. Sometimes the answer is not apparent at first but when you keep substituting you are able to cancel out variables. I feel that as I get more practices with these types of problems I will be more comfortable solving them.

My problems solving skills are good in my opinion, and I feel that they have improved over this last unit. During this unit I have had to look at not just what we are learning currently but equations that we learned in the beginning of the year. I had much larger set of possibilities from which I had to choose the rights way to solve the problem. I think I have gotten better at doing this and I look foreword to more opportunities to hone my problem solving skills as the year progresses.