Phyics of Tennis

Posted on May 19th, 2010 in Uncategorized by slemu

My topic was to  find the physics behind a tennis racket and where the ball bounces the furthest at. I chose to do this because it surprised me that the tennis ball bounces further when hitting different areas of the racket.

By doing this experiment i learned that there is physics in sports which is something I did not know before. I also learned that the reason why the ball travels the furthest on the bottom is because that is where most of the elastic region is at.

Doing this experiment i learned that designing and doing an experiment never goes as easy as you think it will. This happened to me while trying to aim the lobster to different parts of the racket. It never hit the racket where I wanted it to causing it to take a lot more time then planned.

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The best part of my experiment would have to be actually doing it. My helpers and I had a good time doing while getting frusturated that things werent as easy as we thought. The worst part of the project would have to be the heat. The sun was out and it was very hot while doing the experiment making us not want to be out there.

Albert Einstein!

Posted on March 23rd, 2010 in Uncategorized by slemu

Albert Einstein is one of the best known scientist who lived in the time era of the years 1879 to 1955. Albert Einstein is most commonly known for his Theory of Relativity. This theory said that time,weight or mass are not constant. When all this things move  at high speeds they all get compressed and the only thing that remains the same is the speed of light. Einstein said that this happened because energy is equal to mass times the speed of light squared which gives us the famous formula we still use today which is E = mc2. By using Lorenz transform equations and also the fact that the speed of light and the law of physics are the same in any reference frame Albert Einstein came up with the Theory of Relativity. The Theory of Relativity was a great discovery because it changed what we believed about the physics of our world and also because it added new dimensions to our understanding of physics. One of the great discoveries as i’ve said that came from this theory is the equation of  E=mc2. This equation provided us with the relationship between mass and energy. Because of this equation the development of the atomic bomb was made.

The Balsa Bridge That Worked!

Posted on January 7th, 2010 in Uncategorized by slemu

When we started brain storming ideas for our design we knew we wanted to use triangles because it can be the strongest design if used correctly. At the end we came up with a simple but very detailed design.

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Our whole top was a triange and the inside sides were also triangles. The bottom was made up of little triangles as well. 

 

I think that our design succeded  because the design consisted of triangles which is the most stable shape used in construction today. Our design was also strong because it had both a bottom and a top. Having both a top and a bottom helped because not one part of the bridge was feeling a lot of pressure because it was being well distributed throughout the whole bridge.

Our design was closest similar to Esteban’s because his design also consisted of a big triangle.

The way our bridge could have of been improved was by weighing a bit less. That way we wouldnt of been disqualified. Overall though i think that our design was very nicely put together.

my bridge

What i want to learn

Posted on October 7th, 2009 in Uncategorized by slemu

I want to learn how to make bombs, how to make a rocket that flies super fast, and also how to make colorful bubbles that explode and others that never go… POP!

This is what i want to learn how to make!

This is what i want to learn how to make!

Egg Drop Device Reflection

Posted on October 7th, 2009 in Uncategorized by slemu

Step #1- Identify criteria & constraints

                -Sucess 25%                - Your device must have a way for the egg

                -Design 25%                  to be put in on the day of the drop.

                -Construction 25%    - Must land on concrete for drop to count

                -Conference 25%        – Egg must be raw

                                                          – Device must not hit any cars or the

                                                            building

                                                          – Must have a way to raise it up to the roof

                                                          – Must be no bigger than 1m cubed

All this information was given to us during class. The reason why we needed to know all of that was because we were identifying the constraints and criteria which is the first step in the design process.

The second step to the design process is research. My partner and i didnt do any research on the internet or in books. The only thing that would maybe count as research would be Mr. Rice showing us egg drop devices from other years.  

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My partner, or well my Aldair,  and I brainstormed many ideas. Nothing set in stone, just ideas that thought may possibly work. We built of off ideas adding stuff from one idea to the other.

The 4th thing we did was we choose the best solution. After we were finished brainstorming we choose the idea that we most liked and that we thought would work. 

We took the idea that we choose as the best solution and made a model of it.

We had several weeks to work on building our actual model for the egg drop. On September 30, 2009 we tested our model to see if it would work and protect our egg from cracking.

The last step to the design process is redesigning. We’re not going to redesign but if we were we would take leave out parts. Our device i believe  did not need the wings because although it decreased the acceleration of our device,  the boxes it had absorbed the shock of the impact. I think that even if our device was going faster, our egg still would of been safe.

The reason that I think our device was succesful was because it was well protected in the boxes we made out of straws and balsa wood. The boxes our egg was in, were meant to absorb the force of the impact when the device hit the ground. Also the wings that we had on our device decreased acceleration so it had a slower velocity going towards the shock of the impact which would be the ground.

Our device i think was most similars to Ben’s. The reason that I think this is because we had the same kind of wing idea at the top to decrease our acceleration. Also where the egg went in to, was the same type of box made of balsa wood so the shock of impact could go there and not on our egg .

I think our device was fine how we had it and did not really need to be improved in any certain way. Something we could have of done was not of have wasted so many materials and also we could have of have made it smaller. I think it didnt really need any improvment because our egg survived and it was very well protected.

 

Our Device!

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