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evan

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Blog Entries posted by evan

  1. evan

    Blog 6

    By evan,

    I used to own a half-pipe. Well, a mini-pipe rather. It was a about 1.5 meters tall.
    Skate baording on it is interesting because at the top of the pipe all you're energy is due to gravity.
    That means Etop=mgh
    As one rides down the half-pipe, potential energy is converted to kinetic.
    At the bottom Ebot=(1/2)mv^2
    HOWEVER...
    In many sports that include a standing on board, a common method to gain speed is to PUMP. Pumping, in its simplest form, is pushing down on the board when you're going up or down a ramp. Or any curve for that matter.
    Its possible to PUMP on any curve who's concavity faces upwards.
    In the case of a half-pipe: one can pump on there way down the pipe, thus converting energy in their legs to kinetic energy using an impulse (push). And it works too. Its actually quite crucial while skating on a mini pipe.
  2. evan

    Blog 5

    By evan,

    As you sit reading this post, the computer you're using is hard at work.
    For this post i want to talk specifically about fiber optics.
    Though the use of Fiber optics, your computer can send and receive messages much quicker, and for a lot less money.



    Basically, Fiber optic cables are just long glass tubes.
    Your computer sends pulses of light into the glass tubes that get sent out as messages.
    These pulses of light hit the inside of the glass at their Critical Angle thus reflecting the pulses completely.



    technology is fun

    .
  3. evan

    Blog 4 (Physics Everywhere)

    By evan,

    Today I was thinking about how many examples of physics I can think of that are in our everyday life. I came up with 10 examples that I thought were most prevalent.
    1. when we walk, we push the ground backwards, and the ground pushes us forward in accordance with newton's 3rd law... infact we walk only due to presence of frictional force, we do work against friction to walk
    2. An airplane flies due to application of bernoulli's theorem, based on conservation of energy
    3. we tend to move forward when sudden brakes are applied- newton's law of inertia
    4. we tilt towards the centre while riding in a circular path, due to centripetal force
    5. when a hot cup of tea is left for cooling, its rate of cooling varies directly with the temp of the surroundings- newton's law of cooling
    6. we stay stuck to the earth due to gravitational force of the earth
    7. the frequency of sound heard by us of a distant vehicle coming towards us or going away from us changes, this is due to doppler effect
    8. the most important: we see this world colourful, only bcoz evrery object reflects light of a typical wavelength, associated with a unique colour
    9. we see a rainbow, due to dispersion of light by water droplets in atmosphere
    10. we feel warm when standing in sunlight,. because the sun sends energy to us in form of electromagnetic radiations, which get converted into heat
  4. evan

    Blog 3

    By evan,

    when you put a shovel on an old picnic table in your backyard and a leg of the table snaps, it's time for a new table. Problem is, the table can't be thrown away or used for firewood (some parts are just too rotted for anything put the garbage) as it is. It had to be taken apart. The first thing I did was pry off the crossbeams on the table's underside. The crowbar had to be placed at a 90 degree angle and then hammered underneath the crossbeam and pulled. The trick was to make sure the sideways pressure on the crowbar was transferred into the right place. Without something holding the main beams in place, the crossbeams would just pull up the main beams, because energy is always transferred and an object in motion (the main beams nailed to the cross beams) will remain in motion unless acted on by an outside force (my foot). With nowhere else to go, the nails where forced to separate from the board. Next I had to brake up all the beams with an ax. the acceleration of my ax would transfer onto the board, driving the head into the board. The motion I made with each swing was a half circle. sometimes the force would be so great and the wood so rotten, the energy would be transferred too fast for the board and it would break on the first try! These demonstrate two basic laws of physics: an object in motion will stay in motion unless acted on by an outside force; and energy will never be destroyed or created, only transferred. That table sure was destroyed though!
  5. evan

    Blog 1

    By evan,

    I like to listen to music and play video games. I think my favorite part about listening to music is listening to music I've never heard before and seeing if I like it or not. I'm very good at solving problems if I take the time to do it. I like to use different methods to solve them and answer the question. I do this a lot during life too because life is full of problems. However, I think I could improve on my time management and be less of a procrastinator. Lastly, I want to become a surgeon but I don't know what specialty I want to be.
    I'm taking AP-C Physics because I liked Physics last year and I liked challenging myself on the questions that didn't require math but required thought. I think Physics is great for teaching you how to solve problems that you've never seen before and require you to know the topic rather than the equations.
    I am most excited about finishing school and graduating.
    I am most anxious about all the work I'm going to have to do to achieve it.

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