Semana 15 - 27/04/2012

Harmonic motions
--> Amplitude, Period, Frequency

Equation for amplitude and period when x is the position and t =time

Equation for frequency where the period is seen over 1

Equation for angular amplitude where the frequency is multiplied by 2

• A is the amplitude of motion : the distance from the center of motion to either extreme. 
  T is the period of motion: the time for one complete cycle of the motion.
• f is the frequency of motion: the rate of repetition of the motion -- the number of cycles per unit time.
•  is the angular amplitude of motion: the rotational analogy to frequency

-->Phase

• the Phase is the wave cycle which has elapsed relative to the origin.

Equation for a phase where "wt" has the phase in it

--> Velocity and Acceleration

Equation for finding velocity of a wave with phases and frequency

Equation for acceleration similar to velocity although squaring the angular frequency

Experimento del Agua

• As seen in the MIT lecture, our class tested the experiment of transferring water from one bottle to another in the most efficient way possible.
• In pairs we constructed the model from 2 plastic water bottles attaching the mouths of the bottles together with glue and tape, leaving about 400ml of water inside.
• Next we observed and timed the motion of water from one bottle into the other. THis process was slow and the water moved into the lower bottle by creating bubbles that moved upward for the air to escape.
• To speed up the process we made a spiraling motion that created a tunnel for the air to escape (instead of just through bubbles) this proved to be much faster  and more efficient.

Me with David and my creation for the experiment

Ecuaciones para los ejercicios

f=v÷(la onda) 

cuando....

• f=frecuencia (Hz)
• v=velocidad (m/s)

p=mv

cuando....

• p=momentum
• m=masa
• v=velocidad

y=Asin(wt+ fase)

cuando...

• A=amplitud
• wt=angular frecuencia
• t=periodo (tiempo que dura 1 ciclo)

w=2(pi) f

f=1/T --> T=1/f

cuando....

• w=angular frecuencia
• f= number de ciclos por unidad de tiempo en Hz (ciclos/segundos)
• T=periodo

f

Ted Talk

• http://www.ted.com/talks/lang/en/dan_pink_on_motivation.html
• I truly enjoyed this ted talk! Dan Pink talks about businesses and types of motivations that are successful and others that are proven to fail. The motivators that science say are functional and work have been looked upon more recently as a failing system. These motivators are for example when your given a fairly straight forward task you are given a motive such as money to find the solution. From this one would think the greater the insentive the better the work. This has worked on tasks such as labor and physical work (straight forward) but when it came to being creative, the larger the insentive the worse the end result was. Therefore, Dan Pink believes that in order to motivate there are three manners that need to be considered. Autonomy, Purpose and Mastery need to be the motivators. Autonomy- "as in the urge to direct our own lives". Purpose- "as in the yearning to do what we do in service of something larger than ourselves". Last, Mastery- "the desire to get better at something that matters." I also believe in this philosophy and this is actually how I motivate myself now in school and small to large tasks throughout my life. 

Semana 14 - 20/04/2012

Tianguis de Física

• This week we experienced the "Tianguis de Física" through conducting simple experiments.
• Through my understanding "tianguis de física" is method through teaching to get young people interested and undertand the concepts of physics. By conducting these simple experiments one can learn a concept at a more broader stance, then once this spectrum is understood it is easier to get more in depth with that specific concept making the learning process clearer with les confusion.
• Originally a "Tianguis" was an open air market within towns which sold a wide variety of goods. There are still "tianguis's" today but they are more referred to as markets/ mercados. This word applies to physics because through this method it is implied that they're are a wide variety of ways along with questions to help one understand physics, just like the amount of different types of goods you can buy at a "tianguis".

modern day Tianguis

Experimentos 

1. Ondas de la copa - Este experimento es con una copa con liquido en la copa. Entonces, cuando aplicas fricción a la copa la pared de vidrio vibra y comunica la vibración a la superficie del líquido. Sobre la superficie se propaga entonces una onda.
2. Ondas de los palitos - Con un encadenamiento de palitos hay muchas ondas. Las ondas incidentes y reflejadas se superponen y se produce una onda estacionaria. Algunos palitos oscilan con gran amplitud y hay algunos pocos que casi no se mueven.
3. Experimento de tubos - estamos construido un instrumento por tubos. Encontramos cuando hay tonos diferentes depende en la talla del tubo. Tambien, El tono de un sonido que escuchamos depende de la frecuencia de la onda sonora. Una onda de frecuencia grande es percibida como un sonido agudo y uno de frecuencia baja se oye grave.
4. Ondas de Jabón - Con mucho jabón y agua creamos una onda entre un gancho. Cuando movimos la plana de jabón y agua entre el gancho, lo creó una onda.

Ted Talk

• http://www.ted.com/talks/lucy_mcrae_how_can_technology_transform_the_human_body.html
• Very interesting concept on combining biology with technology. This women, Lucy McRae, is inspired to figure out ways to modify the human body in order to positively transform our human evolution. With the help from other scientists Ms. McRae has designed a perfume which you take orally so when you perspire the scent comes from your pores! Crazy! She also mentioned how she is interested in designing ways against aging, which would be highly popular if completed.

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phenomenon