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    CMaggio
    Latest Entry

    Lacrosse is a contact sport in which players use cradle and pass the ball to score. Players can use their bodies to check or delay other players on the field. Also, players can “check” other players’ sticks with their own sticks in order to loosen the ball from the stick’s pocket. I play attack so the sole goal of my playing is to shoot and score.

    The top arm exerts a pushing force on the shaft, the bottom arm a pulling force, creating a type of lever. This forces the head forwards which creates centripetal and the force propells the ball outward. And of course, after the ball finally leaves the stick, there is air friction. Also, the more kinetic energy the throw has, the great distance the ball will trave, especially with a shorter and lighter stick, the ball is much easier thrown.

    Lastly, when we lose possession or I am forced to play defense, when I hit an opponent, the force that I use will be equivalent to the force she applies to me.

  1. Darts

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    Dart throwing uses physics to get the dart to the bullseye and get the highest score possible or if you are playing different dart related games to get the numbers that you need. Throwing darts uses different parts of physics to have the dart hit the target in the area that you want it to. Projectiles and energy to have the dart move through the air and to the target.

    http://t0.gstatic.com/images?q=tbn:ANd9GcRkg2zI4qLuZQhKx--Y_UdKk5MaKRGFgmx59CgycvZwAWUIGoRImw

    The darts are a projectile because they are thrown at an angle and you need to find the best angle with the correct initial velocity to get the dart to the board. The angle at which the dart leaves your hand is usually less than 45 degrees so that the dart goes toward the board and not at the ceiling. Even though the optimal angle for most anything else is 45 you need to change the angle and the initial velocity to get the bullseye. the gravity brings down the dart and this is why you need to aim 'higher' than the bullseye.

    http://t0.gstatic.com/images?q=tbn:ANd9GcTb9a-28ZH2rwYKXkuDsWXqvIHDSGSg2riJ3jAWzUw8DlJL8IZmxQ

    Also you use work because you move your arm which is the displacement and you force the dart to move forward toward the board. Darts use work to make their way to the target because they have to move and the force exerted by the person is on the dart. The darts use the work to make it to their destination. This shows that darts uses physics, by using different equations you can find out everything you need to know.

  2. Physics?

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    willpaggs
    Latest Entry

    We use cell phones everyday. We look at our phones constantly. Iphone users look at their phones 3x more than normal phone users.

    The cell phone uses circuits to power it. It uses waves from cell towers so we're able to call and send messages and stuff. The screen gives off light waves which is what we see when we look at our screens.

    We take advantage of technology. We use things without thinking. We learn how to do things fast, but we don't really know how it all works,

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    When you throw a football to someone you wont think about physics but physics is happening everywhere. You will make adjustments for everything before you throw the ball. You will make adjustments to your head for factors like how hard you have to throw it or the angle you have to throw it depending on how far away your target is. This is all physics but you dont realize it because you do it naturally in your head.

    Whenever you throw a football there will always be a parabolic path because the movement of the ball in the virticle direction is influenced by gravity. As a football travels up, gravity will slow it down until it reaches its peak, then it will stop briefly at that peak. Then the ball will start its acceleration back to the ground because of gravity. This path the football takes is called its projectile motion and here is a picture of what it looks like.

    20092281136226337141778225000003208.jpg

    Some equations you can use for situations like this are

    vf=vi+at

    d=vit+1/2at^2

    vf^2=vi^2+2ad

    Ay=Asin0

    Ax=Acos0

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    dwarner
    Latest Entry

    blog-0828508001366815304.jpg

    FIFA is a videogame that is meant to be a simulation of a real game of soccer. At EA sports, there goal is to make the game as realistic as possible. They make a new game annualy and attempt to improve the game each year. This year, EA sports has made a new ball physics engine. Their goal is to use real physics to make shooting as realistic as possible. This allows the player to take different types of shots like a curling shot or dipping shot.

    This new physics engine uses the accelaration of gravity (9.81 m/s^2) to correctly make the ball drop when taking a shot. It also factors in weather conditions like rain and wind that can also effect the balls movement.

    magnus_effect.jpg

    These new ball physics will allow EA sports to create a more realistic soccer simulation.

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    Most people consider cheerleading a weak activity that requires girls dressing up in cute uniforms and waving around pompoms. However, cheerleading is an intense sport that requires practice, dedication, and knowledge of skills. Just like any other sport, physics is involved in cheerleading 100%. Physics is found in every single motion and stunt. Cheerleading is based on stunts, tumbling, and jumps and since physics is so involved in this sport it makes this sport actually exist.

    A main factor of physics found in cheerleading jumps is force. Newton's Third Law states that for every action, there is an equal and opposite reaction. This relates to cheerleading jumps because as the cheerleader is jumping into the air there is a force being applied which makes the force of gravity react, bringing the cheerleader back to the ground. To increase the height of the cheerleaders jump, they must increase the momentum to get the highest force. Momentum equals mass times velocity, so if you were to increase the amount of mass that is acting against gravity and increase the speed of the jump the momentum would be larger giving the cheerleader higher jumps.

    In cheerleading there are multiple stunts that require alot of skills. The main factor of physics that affects stunting is gravity. In a stunt there are mainly four people, a flyer, two bases, and a back spotter. The flyers center of gravity may change based on how many people are holding her and what kind of stunt she is performing. If two bases are being used to hold the flyer, the flyers center of gravity would compare to those that are holding her. If she were to be doing a one legged stunt then her center of gravity would differ and it would counterbalance the other side that is being pulled to the ground. Gravitational acceleration is another form of physics found in stunting. When a flyer is being thrown in the air she reaches a maximum height which allows her to perform the movement in the stunt. One’s maximum height is the highest that object can go, because its velocity has reached zero. If the flyer does not wait to reach their heighest point then it can cause her to come down early and possibly hit the people who are holding her as she is coming down.

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    Some bad language, but definitely funny...

  3. At this point I am so beyond tired that all I can think about is the time, hence the physics of a clock blog post idea. However just as i became so tired that this idea popped into my mind and I became outrageously enthused and will make this a wonderful thirtieth blog post!!

    There are many methods of operation clocks utilize. These are the spring loaded, pendulum/weight powered and even more modern clock variations which i will explain later. Most of the modern clocks now utilize these next few methods for keeping time. All but the quartz watchs use a device known as an escape mechanism. This escape mechanism serves a very inportant purpose because it regulates the forces applied to turn the clock gears in such a way that they move only a certain amount per second. Regardless of its type, each click has this crucial escape mechanism. The escape mechanism works by transfering the force driving the gears to turn (whether it that force is caused by trasfering the gravitational force from a weight or the force transformed from battery power) into an oscillating mechanism which could be in the form of a pendulum, a spring, or a verge-and-foliot. The oscillating pieces work as the clock's counting mechanism and through the use of gears, the clock is able to keep accurate time.

    A spring loaded clock utilizes the potential energy stored in a wound spring to turn gears that are then stopped and restarted by the escape mechanism which makes the movements of the watches hands move at a certain rate. The main disadvantage of this type of time keeping device is that the spring needs to be wound up periodically or else the resulting placement of the hands will be inaccurate.

    springclock.gif

    The second type I will discuss is the pendulum, also known as the weight powered design. Unlike the spring loaded clock mentioned above this type utilizes the potential energy from a hanging weight to turn its gears and a pendulum assisted escape mechanism to give the clock a certain periodicity. The assisted escape wheel, similarly to the spring loaded clock, has a specific frequency at which it travels which aids in the accuracy of the clock. But unlike the spring loaded clock, a weight driven mechanism keeps more accurate time because it faces less error when the weight gets close to needing to be reset.

    weight-driven-clock-mechanism.jpg

  4. midnightpanther
    Latest Entry

    Everyday at school we have to climb all of those stairs to get to the upper levels of the school and I get exhausted from it, and so I came up with a brilliant solution that no one really thinks is a good idea. You just get rid of the stairs and we have ladders, and some of them can just sit still and other ones can be like moving up or down so you just grab on and you are changing floors. The physics here is that right when you grab on, you accelerate either up or down, like when you are on an elevator. So, if people felt bad about their weight they could weigh themselves right when the grab on the ones going down which accelerates them downward so they would weigh less than they would when standing on the ground normally.

  5. So I'm actually in my honors chemistry class right now, but who cares right? It's not like it's physics... anyways, good to be back!

    Yesterday, in my differential equations class, we started section 2.3-- I don't actually remember the title-- at the ungodly early hour of 9 AM. aka, really not that early. Now, if I/ other AP C past/current students remember correctly, early in the year we discussed air resistance on a falling object. According to Newton's 2nd Law, net force or ma equals whatever you determine to be the net force. In this case, using a force diagram, you have the force of mg down minus the effect of air resistance (I'll use kv in this case because we used it in my math class, though last year we used bv and cv^2 I believe). Thus you have ma=mg-kv, and since a=dv/dt, you have m(dv/dt)=mg-kv . This is (wait for it) a differential equation! Yay!

    Specifically, it is a linear differential equation, more commonly seen in the form dv/dt+ (something)*v=something. So when Mr. F just skipped over the steps/integration/nothing made sense, that's why. It was a DE.

    Note: I don't fully remember how we did the problem, but I think we were just told what the equation came out to, and skipped the actual steps.

    Anyways, you put it into the form dv/dt+(k/m)*v=g (the dv/dt can't have a coefficient), and then you do a bunch of really really really cool steps to solve it. You take the stuff in front of the v (in this case, k/m) and set up this: e^(integral of k/m dt). Clearly, this gives you e^(kt/m). You then multiply everything in the equation by this, giving you (e^kt/m)*(dv/dt+ (k/m)*v) = g*(e^(kt/m)). The left side of the equation turns into d/dt of e^(kt/m) times v. We don't actually do anything to get to this, it's just known that that's what it turns into, and you can check it to make sure.

    You know have d/dt of e^(kt/m)*v = g*e^(kt/m). you integrate both sides with respect to t, leaving you with:

    e^(kt/m)*v=e^(kt/m)*gm/k + Constant ©. Then just isolate velocity.

    That gives you v(t) equals gm/k+ C*e^(-kt/m), and you can solve for C pretty easily (either with v(0)=v(subscript)0 or v(0)=0. And that's your air resistance equation! (hopefully)

    I'm assuming I messed up a negative sign somewhere, or it should be -gm/k, or something else, but that's the general shape of a) a Linear DE and B) this force equation. Hopefully it's mostly right, and not overly boring because it's actually kinda cool. So yeah... go physics!

    Probably the longest blog post I've done, but I deemed in necessary. Sincerely, your resident Swagmeister

    #APC Rules

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    sarabuckbee
    Latest Entry

    So as you can see from the title I have no idea what to write about this week but hey I'm gonna wing it!

    Yeah, so I have almost no clue whats going on right now because of the fact that the whole derrivative thing looks like a divide sign so I'm always thinking we have to divide things. And theres just too many of those triangle signs as well. I wish I learned some of this in Pre Calc or decided to take Math Anaysis. I think I would be much better off if I did.

    Otherwise this class is slightly interesting and not too bad with the basic kinematics sparingly weaved in. This test coming up on Friday will be the true deciding factor on whether I'm going to stay in this class or not...

    I'm gonna be a business major, it doesn't take calculus based physics to fire someone. Just saying :star:

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    The question is this:

    A hiker sets out on a trek heading (N35degreesE) at a place of 5.0 km/h for 48.0 mins. He then heads west at 4.5 km/h for 40.0 min. Finally, he heads (N30degreesW) for 6.0 km, until he reaches a campground 1.5 hours later.

    A) Find his total displacement using vector components.

    SO, i used Ax = 4.0 cos 35degrees = 3.27

    Ay = 4.0 sin 35degrees = 2.29

    Then I looked at the answers and it said I should have used the angle 55 degree angle instead of the 35. How do I figure out when to use which angle?

  6. Guest
    Latest Entry

    I was doing a little research this past weekend on Richard Feynman and came across a speech that he gave at a meeting of the American Physical Society in December of 1959. Of course, Feynman did many great things but I want to focus solely on this speech which basically foreshadows the amazing things that we would be able to do with nanotechnology. You can read a copy of the speech here, http://www.zyvex.com/nanotech/feynman.html , but I thought I would point points that were most memorable to me. Feynman discussed the concept of writing 24 volumes of the Encyclopedia of Brittanica on the head of the pin. He announced that it would be possible if it is demagnified by 25,000 times and each dot is readjusted by photoengraving. In order to read this small print, we would have to make a mold of the lettering and evaporate gold at an angle so that the little letters will appear clearly in a silica film under an electron microscope. If all 24 million books throughout the world were placed onto pinheads, they would use up the area of about a million pinheads. I thought it was very interesting that although we wouldnt be able to read off the head of a pin, we could send books with little effort to devastated countries and underdeveloped nations. It is incredible to think that over 50 years ago, someone thought of this and to compare this idea with the progresswe have made through the years in nanotechnology.

    A very promising lead that emerged from Richard Feynman’s speech was the ability to write on a small- scale. In 1990, the image of atomic manipulation caused quite an uproar. In 1981, scientists developed the scanning tunnelingmicroscope to assist them in seeing single atoms clearly.(Keiper) The image, spelling out “IBM” in just 35 atoms, was created out of xenon atoms and was just the beginning of new advances. By picking up and placing atoms in a desired location, scientists broke through to another new level. Feynman’s speech predicted that this would be possible, as he couldn’t see why it wouldn’t work. Feynman was definitely before his time with many of the topics addressed in his speech but for this particular one, it may have been just what the world needed to get off on the right foot in research and development.

    Sorry that's so long and boring; I found it interesting :)

    [ATTACH=CONFIG]387[/ATTACH]

  7. I saw a video on yahoo news today where a cat falls 19-stories and survives and the reporter seems stunned. If only she took physics with us she would know that is is because of the aerodynamics of a cat and the terminal velocity of their fall to be able to spread themselves out to slow themselves down.Here is the link to the video.http://news.yahoo.com/video/bostonwbz-15750588/cat-survives-19-story-fall-in-boston-28691018.html

  8. ThatGuy
    Latest Entry

    This morning in the lab we had a little physics throwback.

    Stop. uh. Back-it-up. AP_B/Chem

    remember those spectormeters we used? the cardboard things that broke up the light into colors? Well i got to use a real one today to find the wavelength of a laser. Basically you shine whiteish light in one hole so you can see the scale in the back, and the laser in another portal. You look through the lens, and spin the dial until you see a thin line the color of your laser, you line it up with the meter, and look at the dial with your wavelength. It was pretty **** cool.

    Now we also have a computerized one that does it too but it wasnt workin.

    fiskis with phullerton

  9. Blog keeth

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    Finding out ways and means of how you can pursue your higher education with the high costs can be a cause of concern for both parents and students. But with proper research of the variousSchool Grants schemes for financial aid or college grants will give you a solution especially because some of these aids include federal school grants where the students don’t have to pay the aid after graduation and it can be utilized to cover ant expenses while attending college. Federal grants is decided on the financial need of the student taking into account the amount that the family can offer in the section of the Free Application for Federal Student Aid (FAFSA) report; so the student has to be perfectly honest when he fill up the FAFSA application form so that we will be eligible of receiving the federal grants. Once you have been awarded the grant, it is usually deposited in your student account, deposited into your bank or paid by check. The Pell Grant and the Federal Supplement Educational Opportunity Grant (FSEOG) are the two types of Federal Student Grants.

    In many colleges they may have funds set apart as student college grants beside the two Federal Student Grants mentioned above. The details of these college grants will be available in the school’s financial aid office which has to be followed up and taken advantage of as early as possible since most of these grants are very limited and gets distributed quickly. Filling up the application for the FAFSA is the first step that needs to be done to avail Federal Student Aid of any kind and over and above this; most schools have their own forms which will have to be filled provided that you qualify for any of the local or private financial aid that is available. Be sure that you know about your family’s financial resources as this information is of prime importance when it comes to deciding your real requirement for financial aid to avail such student grants. All student grants are reserved for students whose families deserve financial aid, it is worth mentioning that if you deserve such grants, it is worth looking into all avenues including student loans and work study

  10. March is here and along with it comes warm weather and basketball. I thought that a good way to celebrate it would be to put up my basketball hoop. I went to put it up in my lawn (i have it facing the street cause no one ever comes driving down my street) and left it balenced so i could get the sandbags toput on the base. However, the hoop wouldnt stay up. The center of mass isn't the center of the base because it isn't symetrical. So, i placed a shovel on the base to provide enough tourqe to oppose the motion so that it could throw the sandbag on to keep it in place. I took a task that shoulda been easy and made it hard because i forgot about basic physics. But i gotthe job done.

    Random Sports Fact: Harvard is in the tourney for the 1st time since the 1940's

  11. I'm still struggling with the concept of voltage, but here'smy understanding so far:

    Electrostaticpotential is how much work it takes to move a test charge through a field. (W=Fdr) This requires areference point- I am moving the charge from a certain point to another point. These reference points become the limits of integration, and theequation with substitutions works out to be q1q2/(4πεor)when the charge is moved from zero potential (at infinity). However, to make this measure more helpful weeliminate the charge and make electrical potential (voltage/ potentialdifference) equal to work per unit charge to move any test charge in the givenfield. Therefore the equation forvoltage from a point charge is q/(4πεor). However, this is just a restatement of ournotes and what really gives me trouble is trying to conceptualize voltage. It seems that a common analogy to explainvoltage is a closed circuit of pipes with a pump. Apparently electrical potential can belikened to water pressure in that water (charges) will flow from areas of highpressure (aka potential) to low. In thisscenario potential difference would be the difference in water pressure. Apparently voltage actually used to be called"electrical pressure." Also,voltage can be thought of as the ability to do work. Although this statement requires looking atthings from another perspective- how much work is done when a charge goes fromhigh potential to low- it makes sense when you think about how batteries arerated by voltage. I guess what reallyconfuses me about voltage is that it is not a concrete event or force, but insteada measure of "potential" as in: if I had a hypothetical test chargewhat would be the work necessary to move it from here to there. It's almost as confusing as how fields are a"condition in space" which would cause a particle to move if aparticle was present!

  12. Blog smithr7

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    Complete Electricity and Magnetism Review

    Reviews + Quizzes + Exams

    [ATTACH=CONFIG]360[/ATTACH]

    Link:

    https://market.android.com/details?id=air.com.example.EMReview&hl=en

    Are you disappointed with your last E/M Review purchase? Was it incomplete and/or misleading by giving the wrong answers? Well look no further, as you have stumbled upon an intuitive and complete review of the physics involved with electricity and magnetism.This app will improve your understanding over Calculus-Based and Fundamentals of PHYSICS: Electricity and Magnetism.Whether you are a college student seeking help throughout the semester or a graduate preparing for a tough exam, this is the app for you.The in-depth review will quickly grab your attention with general principles, important concepts, equations, and real world applications.

    After the review, quiz yourself on each topic with many multiple choice questions.

    Standardized Scoring coming soon...- 2 - University Exams are available for additional testing - Keys are posted to check your answers.

    Final exam coming soon...All Topics Covered:

    -Electric Charges and Forces

    -The Electric Field

    -Gauss's Law

    -The Electric Potential

    -Potential and Field

    -Current and Resistance

    -Fundamentals of Circuits - DC circuits

    -The Magnetic Field

    -Electromagnetic Induction

    -Electromagnetic Fields and Waves

    -AC Circuits

  13. Blog lacrosse12

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    Gunnar Miller' date=' Nick Nolan, Kaiya Williams[/font']

    Car Crash Web quest

    The car crash web quest included two vehicles a Subaru (200kg) which was at rest and a Cadillac (300kg) which ran into the Subaru. The first objective we tried to solve for was the velocity of both vehicles after the crash. We were given the acceleration of both after the crash which was -3m/s^2 for the Subaru and the Cadillac’s was -2m/s^2. The distance that they went after the collision was also provided Subaru (24m) and the Cadillac (2m). we knew the car cars came to rest after the crash so Vf=0 for both. Once we knew we had three of the five solving for Vi would be simple. We used the formula Vf^2=Vi^2+2ad we plugged in and did two separate equations for both vehicles and the Subaru’s initial velocity was 12m/s and the Cadillac’s initial velocity was 2.83m/s.

    Next we were required to find the momentum immediately following the collision with our physics knowledge of the formula Momentum=(mass)(velocity) or P=mv we had both vehicles masses and velocity’s prior to the crash. The way we solved was as follows Cadillac: P= (3000kg)(2.83m/s)=8,490kg*m/s Subaru: P=(2000kg)(12m/s)=24,000kg*m/s. after finding these two momentums it played a huge role in solving the rest of the lab.

    The next part was finding the Momentum before the collision this was a very simple step in the lab we knew that before the collision the Subaru was at rest so the momentum of the Subaru was 0kg*m/s knowing the law of conservation of momentum we knew the total momentums of the vehicles after the crash would equal the momentum of the Cadillac before the crash. This lead us to add 24,000kg*m/s+8,490kg*m/s= 32,490kg*m/s.\

    Finding the velocity before the crash was similar to the problem before we knew the Subaru’s velocity was 0m/s because it was at rest. To find the Cadillac’s velocity before we derived the formula Vs=(msuv)(vsuv) + (mwagon)(vwagon)/ msuv = 32490kg*m/s /3000kg= 10.83m/s. Knowing the speed limit was 35km/hr so we converted 10.83m/s to 38.99kh/hr so we knew that the Cadillac was speeding before he hit the wagon.

  14. Guest
    Latest Entry

    This past March, scientists watched a Black Hole devour a star. It's roughly ten times the diameter of our Sun, but has about 8 million times the Sun's mass. NASA scientists recently made a great animation of what they saw for us mere mortals that have no idea what the people staring through the telescopes are talking about.

    As for the unfortunate star, when it entered the black hole the energy in the star swirled around the black hole, forming a disc of light at millions of degrees and spinning at near the speed of light. The blast seen in the animation began at moving roughly 90% of the speed of light. The energy for this requires roughly one octillion (1,000,000,000,000,000,000,000,000,000) tons of matter moving at over 100,000 kilometers per second.

    "There are more things on heaven and earth, Horatio, then are dreamt of in your philosophy."

    http://blogs.discovermagazine.com/badastronomy/2011/08/26/star-eaten-by-a-black-hole-still-blasting-away/

  15. I was at the gym the other day watching one of my teammates do her uneven parallel bar routine, and I thought about something new: in her giant swings, her feet would have to be moving extremely fast in order for her body to make it around the bar. How fast do they travel?

    A giant is a skill on the uneven bars in which a gymnast swings all the way around the bar in a handstand, ex:

    Giant swings follow a pattern of uniform circular motion. I timed one of my teammates doing her giants, and one swing took approximately 1.35 seconds to complete. Because she is 5' tall (60 inches), the radius of her motion is 60". Using the equation vc=(2πr)/T, I subbed in the values: vc=(2π(60))/1.35 to find that her feet were traveling at 279.25 in/sec. This means

    that my teammate's feet travel at 190.4 mph in her giant swings, which actually sounds very wrong.... Ah well, I

    tried.

  16. Ok, so everybody has obviously heard of spontaneous Combustion but doesn't know what it really is, atleast I didn't before this. For spontaneous combustion to work there has to be a Pyrophoric substance. A Pyrophoric substance is something that reacts to strong oxidizers such as oxygen or water. Anyway the Pyrophoric substances have very low ignition points which are ignited by contained heat in the pile or where ever it is. Examples of a Pyrophoric substance are sodium, haypiles or compost. The biggest cause of the creation of heat for the ignition of the substance is from bacterial decomposition, where the bacteria break down something and by doing so release heat that is trapped and therefore builds up the heat in say the pile of compost which eventually ignites the pile of compost also know as spontaneous combustion. For a really big bang the most volitile Pyrophoric substance are Rieke metals which actually explode when contacted by Air.:tyrannosaurus: and dinosaurs are cool hence the t-rex

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    Just over a month ago, when I walked into physics class for the first time, I thought it'd be a drag like all the other science classes I had to take. I was that girl who's heart was filled with trombone, head filled with music and the only reason for taking physics was because my counselor made me; I had absolutely no interest in the course and that was the attitude I assumed would carry throughout the entire year. Why did I care what physics had to do with my life? What did it matter?

    Then, probably a week ago, I found myself thinking more and more about physics. When I looked around me, I started wondering what type of physics is involved at what I was seeing. What physics is involved in a trombone slide? What physics is involved with the sound I hear when music is played? While walking home, I began thinking about the physics of airplanes, of cars, of myself--and tonight it finally hit me that physics is all around, that it's everything. I'm seeing things in a new perspective; I'm questioning more, I want to learn more. I don't view things the way they appear anymore--I look at something and wonder how physics is involved. Even though in class we're still working on free-fall, I can't begin to describe how much I've learned so far--and it's only October.

    Last month, I was just another girl forced to take another class she didn't care about. Today, I'm a person who's seeing everything differently; who constantly questions things and constantly wants to learn more, all because of physics.

    And it's awesome.

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