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  1. tuttutgoose


    Lately in physics we have been talking about waves and the different types of waves. We learned about a transverse wave which are perpendicular to the direction of wave travel. Besides transverse waves we learned about a longitudinal wave which are parallel to the direction of wave travel. Another type of wave is a mechanical wave, for a mechanical wave to work it must have a medium. Sound is a type of mechanical waves they need a medium for them to work. Which is why in space you can not hear sound because there are no mediums for the sound wave to travel though. When a wave enters a new medium its frequency stays the same. The last type of wave is an electromagnetic wave, and it is different from a mechanical wave because it does not need a medium to travel through. A single vibratory disturbance in a wave is called a pulse. The amplitude is the height of from when the wave is at rest to the crest.
  2. Like for everything else in physics there is an equation for waves. The equation is velocity= frequency times the wavelength. Velocity is determined by the medium (speed), which means that the medium determines how fast or slow the wave is. If frequency increases wavelength decreases, they have an inverse relationship. Meaning that if one goes up the other one goes down. Frequency is measured in hertz, velocity is measured in meters per second, and wavelength is measured in meters. If you were given a problem where it says that the frequency of a wave is 10 hertz and the wavelength was 2 meters, to find the speed you would multiply the frequency and wavelength together resulting in 20 meters per second. If you were asked to find the frequency of a wave and you were given the velocity and wavelength you would divide velocity and wavelength.
  3. Interference is when two waves are coming towards each other and you want to determine what happens when the two waves meet. Interference occurs when waves in the same medium, meet at the same time, and at the same location. Superposition is when you add the two waves together to find out what happens to the amplitude at the point that they meet. A constructive interference is when the amplitude is higher (bigger) then the two initial waves. The destructive wave is when you add the two amplitudes the number should be smaller then the two initial waves. With a destructive wave there is a point where the two waves actually make a straight line. You still add the two amplitudes but the resulting number is smaller. With constructive and destructive waves after the waves have meet they continue on in the direction that they were initially going in. The last type of interference is a standing wave, that is when two waves are approaching in the same medium, same frequency, same amplitude, and traveling in opposite directions.
  4. In physics we learned about electric current, resistance and conductivity. Electric current is the flow of positive electric charge and the units are amperes (A) which is equal to one coulomb per second. To find the electric current you divide coulombs by the time. An example to find the electric current is when you are given 1000 coulombs and .6 seconds. Divide 1000 by .6 and you would get 1667 amperes. Conductivity is how well a material conveys electric charge. Conductivity depends on the number of free electric charges available to move and also the mobility of charges.
  5. in class we just learned about the rules of suction. Suction is when the something of production becomes a partial vacuum by the removal of air,At dairy queen they have this motto where the blizzards are so thick that you can flip the cup over and the item in the cup won't fall out. When they bring your order over, they say what it is and then hand it to you upside down just to prove that they are living up to their motto. As they are doing so they say that it is because of the thickness of the ice-cream. But I have come up with a better reasoning. The reason, or the idea, that the ice cream doesn't fall out, is because of the suction not thickness. When you make a milkshake or in this case a blizzard, if you look how fast the ice cream is being spun , you start to see it thicken up. Then because of fast the machine is working, it is taking air out; acting like a vacuum.
  6. tuttutgoose


    I love to ski! Whenever i can find an opportunity to ski i will ski. What is interesting though is that physics is applied when you ski. When you look at skiing you can apply Newton's three laws the first law being an object in motion will stay in motion and object at rest will stay at rest until acted upon by an outside force. a skier is able to go downhill without stopping, gravity is what puts the skier in motion and the skier will not stop until an outside force acts upon it. An example of outside force is a skier or a tree. Newton's second law states that force equals mass x acceleration. Using this we can calculate how much force we have or going to have when we go down a hill by taking our mass and multiplying it by our acceleration. By using this we can calculate our force we can also figure out how much it would hurt if we were to run into another skier. And our last law states that for every action there is an equal and opposite reaction. This is used when we are using our poles to push the ground away from us to get started, in a sense the ground is pushing back. So when i push down on the ground to get myself started, the ground pushes back up at me allowing me to move forward. From now on i will think of physics when im skiing, i'll also watch out for other skiiers.
  7. Because i am an athlete, i really enjoy being outside and being active. Even in the winter, i like to be outside and the other day i was walking by the town hall and i saw the ice rink. There were some pretty good skaters on there, in the corner i see someone making figure eights, just like a professional ice skater would do. I always have admired ice skaters, especially those in the winter Olymics, they are able to turn so quickly in a certain amount of time. One of the units that we have learned in class is frequency, which is the number of revolutions completed in one second. When you watch a professional ice skater you think that they are doing one revolution in one second, when in reality they are doing three revolutions in one second. To find their frequency when turning we would divide the number of revolutions they have done by how long they continue to spin. They also apply angular momentum which characterizes an object's resistance to change in rotation. When they are rotating they apply a force called a torque it helps speed things up. When an ice skater brings their leg up while spinning, they apply anuglar momentum .
  8. Lately in class we have been talking about work and energy and when we can see it being applied. Work is the process of moving an object by applying a force, so if we are pushing someone and they end up falling in that direction then you are applying work to them. When I think of work and applying a force I think a weight lifter uses a lot of work, they apply a force to apply to the weights to be able to life them. If a weight lifter is lifting a 100kg weight and their displacement is 2 meters the work being done is 1962 Joules. For a force to have done work on an object it must cause displacement, the weights had started on the ground and then raised two meters. Weight lifters must use work and energy to be able to lift their weights.
  9. I was home watching the avengers the other day and in one of the last seen the bad guys come frying out of the sky using a teleport and there is no way a teleport can be created. The bad guys also came flying out of the sky at ridicules speeds and there is no way they could adjust to our atmospheric pressure of agust to our gravity. They would have not been able to pull up in time without hitting the ground.
  10. I swim every day and I just realized there is so much physics in swimming. Whenever I take a stake in the water and equal and opposite reaction happen. Whenever I take a stroke the same force is pushing back on me. Which makes me move forward. The same thing happens when I take a flip turn and witches helps me to jump off the block. Whenever I try to Brest stroke kick I always slowly sink, I just think I don’t do it fast enough. Gravity makes me fall but because of the water I don’t fall as fast as I would if I was falling freely without resistance
  11. Playing volleyball has a lot of physics. For example the serve, now when I survey toss the ball really high and I try to contact that ball at the highest point and at that highest point is where the ball stops for a split second before it starts to fall again. During hitting lines I also try to do the same thing when the setter sets the ball it travels a certain distance and when the ball reaches it peek it is a lot easier to hit, and when there is no block to try and stop the ball from landing it makes it a lot easier to hit.
  12. I was watching one of the old superman episodes the one when superman catches Louis lane right before she hits the ground and goes (skerplater). The episode starts out when Louis lane gets pushed of a skyscraper by a bad guy. And right before she hits the sidewalk superman comes swooshing in and catches her. This is impossible! Physics shows us that an objects greatest velocity is the moment right before she hits the grounds. Lois lane would have been cut into 3rds. Also because superman’s arms are probably really hard it would seem impossible for her to be catch smoothly.
  13. Harrison, Dan, Seth, TutTut The problem we faced today is that we wanted to see if cars were speeding down cooper road. So to test this we recorded how long it took a car to go 10 meters, then converted that time into miles per second and recorded our data. To do this experiment, we measured out 10 meters on the school sidewalk facing the road. We had one person with a timer stand at the start of 10 meters and someone else with a timer stand at the end of the 10 meters. We recorded 10 cars go by. One at a time we recorded how long it took for each car to go 10 meters. We recorded the time the time it took then converted the time from meters per second to miles per hours. In this lab we measured the speed of cars going down cooper road. In our data we found that the cars going down cooper road were going slower than the speed limit. What we could do to improve our data is being more accurate at timing the cars, or possible get a radar gun to measure the speed of the car. There is not a speeding problem on cooper road. The data suggest that there is an under speed problem on cooper road. The cars are going to slow, the fastest car was measured at 32.42 miles per hour. Thus proving that the cars on cooper road are not speeding but in fact are going to slow.
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