# katrina27

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16

1. ## the physics behind taking your physics test!

After taking this class we now can all answer the question that stumped us at the beginning of the year; What is physics? its everything. The crazy part to think is that its actually true. Anything anyone could ever think of has to do with physics. Tomorrow we take our final for this class, struggling to remember every little thing we can. The crazy part is that taking that test is physics. If we're lucky, we'll drive to the test. How does a car run? and electric circuit. physics. Along the way you probably have to pick up a friend or two, and you use your cell phone to tell them you have arrived. Another electric circuit. Hopefully before all of this you showered, and thanks to gravity the water fell down on you instead of floating. After that you stumble around your room trying to find clothes that match thanks to all the colors we are able to see on the spectrum. Arriving at the school, you have to have an acceleration from sitting in your car to get into the testing room. Although some will be moving at an incredibly slow constant pace, trying to avoid the test. Sitting in your test you will put a force on the chair, which will then push up on you at the same force to keep you in that chair. Thanks to the florescent lights we will be able to see our test. So while you're studying, don't say you don't know much about physics! Because everything you do, even going to the test is physics! Best of luck!
2. ## Static Electricity!

haha i think the cat is better than the wall too! yay for polarized balloons!
3. ## Waves at Concerts!

having a concert in space would be cool! too bad its not possible!
4. ## The solar system; why planets orbit.

We look up in the night sky to see stars and the moon, we don't think much of it. But there is so much about our solar system that we don't know. Our solar system can be defined as a star and all the objects orbiting it as well as all the material in that system. Our solar system includes the sun together with the eight planets and their moons as well as all other celestial bodies that orbit the sun. Ancient astronomers observed light that appeared to move among the stars. They called these objects "planets," meaning wanderers. Then named them after Roman deities—Jupiter, king of the gods; Mars, the god of war; Mercury, messenger of the gods; Venus, the goddess of love and beauty, and Saturn, father of Jupiter and god of agriculture. But what does this all mean? There is no force that causes the planets to rotate. Most of the rotation comes about from the conservation of angular momentum. In the case of orbital motion, the counteracting force is gravity; gravity causes the body to continually fall towards the center, and this exactly counteracts the force resulting from the centripetal acceleration. This results in a limit for how fast an object can rotate and still keep itself together. If it rotates too fast, the outward acceleration felt by the elements in the body may be more than the force that keeps them bonded together, and if this happens, the body breaks up.is that the gravity of the sun keeps them in their orbits. Just as the moon orbits the earth because of the pull of earth's gravity, the earth orbits the sun because of the pull of the sun's gravity. To put it simply, the reason planets rotate around the sun is that the gravity of the sun keeps them in their orbits. Just as the moon orbits the earth because of the pull of earth's gravity, the earth orbits the sun because of the pull of the sun's gravity. Why does it travel in an elliptical orbit around the sun? This happens because the earth has a velocity in the direction perpendicular to the force of the sun's pull. If the sun weren't there, the earth would travel in a straight line. But the gravity of the sun alters its course, causing it to travel around the sun, in a shape very near to a circle. We have a stable orbit which allows us to not get too close or too far from the sun. One physicist who made laws about planets was Kepler who said; The path of the planets about the sun is elliptical in shape, with the center of the sun being located at one focus. (The Law of Ellipses) An imaginary line drawn from the center of the sun to the center of the planet will sweep out equal areas in equal intervals of time. (The Law of Equal Areas) The ratio of the squares of the periods of any two planets is equal to the ratio of the cubes of their average distances from the sun. (The Law of Harmonies)
5. ## the physics of car wheels

this will come in handy when i start driving and think about my tires.
6. ## Physics of swimming

i love to swim! it makes it seem like swimming is a lot of work!
7. ## Shooting stars

A clear night allows us to look up at the sky and see something wonderful; stars. How many stars? countless. Basically stars are exploding balls of gas, mostly hydrogen and helium. The huge reaction occuring in stars releases electormagnetic radiation which allows us to see them. A star is a giant ball of plasma which is held together by gravity. Stars are fueled by the nuclear fusion of hydrogen to form helium inside. The relase energy from the central regions of the star provides the pressure necessary to keep the star from collapsing under its own weight, and the energy by which it shines. Stars that are falling are actually tiny bits of dust called meteorodois falling to the earths atmosphere. Hopefully you have been able to see a shooting star before. S shooting star is a bright light which shoots across the sky. But what really is it? Physics can answer that. They needed to know the stars height above the earth, the distance from the observer, and its mass. But how could this ever be figured out? Height, Distance, Velocity. Where two people could watch the same star and calculate. Meteors enter earth's atmosphere at velocities centered around 20 km/s. As the kinetic energy carried by a massive object scales with the square of the velocity, meteors are objects have a lot of energy waiting to be released. Stars are little chunks of rock in space and when the Earth moves around the Sun, it will run into some of these small rocks that collide with the atmosphere. The atmosphere heats them up and cause them to glow and eventually burn out.
8. ## Physics of Sailing

very cool! sailing sounds like a lot of fun and a lot of physics!
9. ## 42!

sports have a lot to do with physics! very interesting!
10. ## why do Iphone screens shatter so easily?

Any iphone user would be afriad of their phone looking like the one in the photo below. So many people own the Iphone, yet is it really a safe phone to have? no. Being an owner myself i will admit, i love this little piece to technology. Although it is very fun and helpful, it is not durable. Iphone 4 varies from the 3G and 3GS because the iphone 4 has both a front and back screen composed of only glass, whereas the front of the iphone 3 is glass front. When remaking the iphone design for the 4, Apple decided a scratch reistant screen was important, so in doing so they found a harder material. This harder glass is scratch resistant, but here lies the major problem. The harder material allows much less flexability when the phone is droped. Flexiability of the screen is what would save the phone when dropped. Because it lacks flexiablity the stress of the force on the glass upon collision with the ground causes it to not bend, but shatter. Another main reason the iphone is so prone to a shattered screen is that the glass screen hangs over the edge of the phone, so when it is dropped every bit of force is put on that one spot of the glass. The iphone 3 had a metal ring around it which protected the glass. Becuase the glass hangs over the edge of the phone the glass it what recives the impact of the fall. The Iphone 4 is so likely to shatter when dropped because all the momentum gained when it is dropped is let out on a hard, nonflexable material. The force the phone hits the ground with is too much for the glass to handle, and shatters. So with this said, all iphone users need to be careful with their phones, for even a very small drop can cause a ruined phone. Times like this when i wish Newtons laws were not true. Gravity is a serial killer of iphones. Beware.
11. ## Physics of Field Hockey

I am a forward for my school's field hockey team, so I have learned the best ways to score and avoid defense. But back in the fall before I studied a lot of physics I didn't realize physics controlled my sport! Field hockey is a great example of physics! I love my sport, but before physics I never stopped to think why the sport actually works, and why things happen the way they do. Field hockey is physics because of friction, momentum, and force. IHS is lucky enough to have a turf. This makes my life a million times easier. The turf has short, even blades, whereas grass fields are uneven, bumpy, with long or patchy grass. The turf is smoother therefore is has a lower coefficient of friction. This means I can hit the ball with a force and it will go farther on turf. If I were on a grass field I would have to put in a much greater force on the ball to move it anywhere. Also because the turf is an even surface there are no bumps which will slow down the momentum of my hit. Much like the baseball video we watched, hitting the ball on the right part of the stick makes a huge difference. Although I have never seen a stick shatter, I know it has happened. Impacting the stick and ball causes the stick to flex and the ball deforms a bit. But hitting the ball on the right part allows the maximum amount of force the player exerts on the ball, for the ball to use in its travel down field. Therefore field hockey is physics because of the components that make field hockey work!
12. ## why guns have recoil

wow 2000 feet per second is fast! what gun has the most recoil?
13. ## Do cats always land on their feet???

i like his mustache! i wish humans could do this too! yay for cats being superior!
14. ## Jay

i like your reasoning for taking physics! i agree with them all good luck broadening your horizons !
15. ## Aw yeah physics yeah

you have great talent and great dreams! you go girl. i love my kitties too >.< the iphone thing is totally understandable we got very different things out of chemistry.. so good for you!
16. ## yay for learning!

My names Katrina, and i am a junior this year. as much as i complain about school i really do like to learn but i just get lazyy. i also get to crazy and hyper to sit still and quite all day. i play field hockey, i dance, and i am into photography. but field hockey pretty much controls my life. i'm also obsessed with my older sister, and my two younger step sisters. i am taking physics because i didn't want to go without science this year. I have no idea what i want to do when i'm older so i figured i might as well take the classes while i can to find my interests. Although it's not my easiest or favorite class i decided to give it a try in hopes it would be better then chemistry. so far i like it more just because its more math related, which is a class i like. i'm excited to see where this year takes me!
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