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Everything posted by jwdiehl88

  1. A simple snap-back mousetrap is a clever machine. With just a few parts (a wooden base, a spring, a metal bar, and a trigger mechanism) it can do its job quickly and efficiently. When a mousetrap is set, the spring in the center is compressed, becoming a source full of potential energy. This energy is being stored, not used, but as soon as the trap is released, it is converted to kinetic energy (the energy of motion) that propels the snapper arm forward. This is a perfect example of conservation of energy. It takes an amount of force to set the mousetrap and when the trap is triggered, it creates a force onto the mouse that triggered it.
  2. jwdiehl88


    It so cool to think that color absorbs light and that different colors mixed with each other creates different colors.
  3. jwdiehl88


    When I bought my racket, the sales person said that the lower the tension of the strings, the more power but less control you get. But the higher the tension, the more control you have but less power.
  4. It must take a lot of energy to even move the cruise shape just because of its sheer size!
  5. Would the amount of air you blow or how fast you blow air into the saxophone affect the vibrations in the air?
  6. jwdiehl88

    Fly System

    So the 20 pound weight lifts and holds the 320 pound picture in the air like it's in equilibrium.
  7. Wow that's really cool how the ecu can measure how much oxygen and gas is being used and then if there is to much convert it into a high rate of combustion.
  8. jwdiehl88


    Would you able to change the frequency of the whistle by making the whistle bigger or smaller?
  9. The speed of any wave/the speed of sound depends upon the properties of the medium through which the wave is traveling. But first if there is no medium for the wave or sound to go through, then there will be no sound. For example, there is no medium in space so there is no waves/sounds travelling in space. There are two factors that effect speed of sound. One of them is the elastic properties of the medium/material. Elastic properties of an object is how easily the object is able to bend or deform when a force is acted upon it. So the phase of matter effects the elastic properties of the medium. For example, longitudinal sound waves travel faster in solids than liquids and gases due to their elasticity properties. Another factor that affect the speed of light is the density of a medium.The greater the density of individual particles of the medium the slower that the wave will be. A sound wave will travel faster in a less dense material than a more dense material.
  10. Oh so since energy can't be destroyed or created and the velocity is a constant, the only thing that has to change to conserve the energy is the mas.
  11. A couple of summers ago, my family and I went to Hersey Park for vacation. I'm afraid of heights but I love to go on roller coasters and I remember that there was a Ferris wheel that my sisters persuaded me to go on. It was scary because you could see how high you were from the ground. But it was also cool because you could see everything. Anyways, a Ferris wheel can be related to physics because of its shape. It is related to centripetal force and torque. So basically, I could calculate the torque that a rider feels on the Ferris Wheel. All I need is the radius, the mass, and the linear acceleration. To find the linear acceleration, I would calculate the centripetal acceleration of the Ferris wheel. So I would need the velocity and radius of the rider. Then I could convert the centripetal acceleration to angular acceleration. Then I would calculate the moment of inertia by doing mass times the radius squared. Finally to find the torque I would do the moment of inertia times the angular acceleration.
  12. When I was a kid, my parents bought me a yo-yo. At first I was puzzled and wondered how to play with it. I spent a good amount of time practicing and I could finally make it roll and then come back to me. I thought that was a huge accomplishment, but then I saw on TV a yo-yo contest with these people doing insane tricks with their yo-yo. I never knew how they could do it. So I decided to see the physics behind a yo-yo. I found that when people do string tricks that makes the yo-yo roll on the string is due to friction. There is friction between the string and the axle that prevents the yo-yo from spinning, allowing the yo-yo to roll on its own string and not giving out more string. This may seem simple but it applies to an yo-yo. Newtons first law that says that an object will stay in motion until an outside force is acted upon it. This is why a yo-yo comes back to your hand. You can flick your wrist and cause a force that push the yo-yo from its string and then you flick your wrist back to get the yo-yo back to its original state.
  13. Our brain are set up to receive and interpret messages from the eye. Optics, a branch of physics, studies the interaction of the light and the eye. This interaction plays an important role in optical illusions. Optical illusions use light, colors and other features to trick the mind into thinking of things that are or aren't there. For example the Lilac Chaser Illusion. In this optical illusion, the viewer sees purple blurry dots arranged in a circle around a focal point. As you stare at the plus sign, it will appear as if a space is running around the circle of lilac discs. But after the viewer continues on staring, they will eventually see a green disc moving around the circle instead of the space. Then if the viewer continues on staring, they will then see the disappearance of the blurry dots and only see the green dot moving. We perceive movement and when we see something at one point and then at another, we believe that it is in motion. Also, when blurry objects are located in the periphery of our visual field, eventually they disappear when we have our eyes fixated on a certain spot.
  14. Jenga, it's the classic block-stacking, stack-crashing game that everyone played as a kid. You and the person you played with, stacked up pieces of block into a sturdy structure and then you remove these blocks from the bottom or middle and placed them on the top. As you removed a block from the structure you had to be careful of how you removed it because one wrong twist or turn, you could collapse the structure and lose. The reason why it's so hard to remove the block from the structure because there is a friction on the block that resists you from pulling the block fast and smoothly. If the block isn't removed smoothly then the structure will collapse. The reason why this game works and why the structure stays in place when you remove blocks is because of the center of mass of the structure. Even if you take a block from the middle of the structure, this doesn't affect the structure to fall down immediately because the center of mass doesn't move when move the block. It stays constant and keeps the structure from falling. Since the center of mass of the structure doesn't move, the only time it falls is when a block is removed that makes the structure unbalance and fall over.
  15. Did you know that you transfer about ninety percent of your force upon a pedal of a bike into kinetic energy? Riding a bike is so simple but there is so much physics behind it. As you ride a bike there are multiple forces on you. There is a force of gravity downwards on you, so as you slow down, the force of gravity will push you and the bike down. There is also a drag force and frictional force acting on you and the bike. The drag force is the air resistance you feel when you go downhill. If you're going at a high speed with your bike then you can feel the air resisting you from going down the hill. Also you can't forget the frictional force between the tires and the road. Then there is a force pushing you forward which is caused by the work the person does by pedaling. As the person decreases its work then, the frictional force will be greater causing the bike to slow down. But if the person increases its work, the force going forward will be greater than the frictional force causing the bike to speed up.
  16. Could you create an invisibility cloak? I mean if it was possible it would be insane. But what if there exists a material that scientist created that allows it to bend light or an electromagnetic radiation of an object, giving the appearance that it isn’t there at all. Light is electromagnetic radiation, made up of vibrations of electric and magnetic fields. Natural materials usually only affect the electric component. However metamaterials can affect both the electric and magnetic field. Metamaterial is a material engineered to have a property that is not found in nature. They are made from multiple elements composite from materials such as metals or plastics. Physicists from the UK and Germany made one small device that made small objects invisible to near-infrared radiation and worked in three dimensions.
  17. The hovercraft hovers by creating a cushion of air with enough pressure to the weight of the craft and the passenger. The fan constantly blows air molecules into the cushion. The cushion inflates, and there are a couple of holes in the cushion that allows some air molecules to escape so the cushion doesn't explode from the pressure. The trick to get the craft to hover is to have the air molecules exert greater pressure or force than the weight of the craft. The air pressure needed to lift the hovercraft equals the weight of the craft and the passengers divided by the area. Pressure = Force / Area. It seems like pressure and area are inversely proportional, however, the larger the surface area, the greater the weight of the craft and therefore more pressure would be needed. Also the larger the area, the greater drag or resistance on the craft is created.
  18. jwdiehl88

    MRI machine

    Oh so that is probably why people take their earrings or remove any metal piece off their body before they get a MRI.
  19. Is time travelling even possible? Maybe, but to time travel a person has to be faster then light which is impossible because no one has enough energy to move faster than that speed. However, Einstein’s special theory of relativity, developed in 1905, shows that time passes at different rates for people who are moving relative to one another - although the effect only becomes large when you get close to the speed of light. If anyone has seen the TV show, the "Flash," the Flash is able to run at incredible speed. He is relatively faster when a person watches him. But in his own body he is running normally while everything else in the background is a blur. Relative to him running at a speed close to light, his perception of fast is different to a person that is much slower than the speed of light. But there may be an out to be found in general relativity, there are a possibility of wormholes – a kind of tunnel through space-time connecting otherwise very distant parts of the universe.f the “mouths” of the wormhole are moving relative to one another, then traversing the bridge between different points in space would also take a traveler to a different point in time to that in which she started. The Flash is fast enough that he creates his own wormhole where he is able to travel between worlds and time itself.
  20. The last time I was on a airplane was when I was traveling to Florida for vacation. I wondered how almost 200 people and the mass of the plane didn't weigh the plane down. The forces on the airplane is at equilibrium when the airplane reaches at a certain altitude. Additional when the airplane reaches at a constant velocity therefore the forces on it all must be balanced. This means that the lift force (L) generated by the airplane wings must equal the airplane weight (W), and the thrust force (T) generated by the airplane engines must equal the drag force (D) caused by air resistance. The airplanes wings and the fins in the back of the air plane, cuts down on drag force and increases the lift of force when the plane is increases its altitude. The wings and fins makes the airplane aerodynamic letting the airplane go faster when its flying in the air.
  21. Yeah I saw parts of the game and that kicker should definitely get some bonuses. You could kinematics to solve how high and far the ball is being kicked.
  22. In AP Chemistry, we learned a little bit about transistors and how semi metals are used in the transistors to help electrons jump side side causing electricity.
  23. Both of my sisters used to dance and when I was younger I went to their dance recitals. Every year I went, there was always that one dancer who would spin on her toe for the longest time. I always notice that when ever the dancer slowed down while spinning, she whipped her legs around in a circle again and then she started to spin faster. I have always wondered how one leg motion could keep you spinning for the longest time. Well this simple spinning of a dance can be explained through angular momentum. When the dancer starts she extends her legs out to have a larger radius. With this larger radius, her angular speed is small, but when she whips her legs around and tightened up her leg to her body, the radius is smaller. The angular momentum is the angular speed times moment of inertia initial equals the final. The dancer with the large radius has a large moment of inertia and low angular speed. When she brings her legs together, the moment inertia becomes less and the angular speed increases. Therefore she can spin faster when she puts her legs out and then whips it back into her body.
  24. Music, who doesn't like music? Music is an universal langue. Music can be heard in any mood or activity. It's just a thing that everyone does. Yet how can we listen to music in general? Well sound is produced when a medium is being vibrated. A medium could be air, water, etc... Vibrations in air are called traveling longitudinal waves, which we can hear. The reason why sounds can't be heard in space because there is no medium where sounds can vibrate in. Since sound can't vibrate in a medium, sound can't be heard in space. Sound waves consist of areas of high and low pressure called compression and rarefaction. Additionally the wavelength and the speed of the wave determine the pitch, or frequency of the sound. Wavelength, frequency, and speed are related by the equation speed = frequency * wavelength. Since sound travels at 343 meters per second at standard temperature and pressure (STP), speed is a constant. Thus, frequency is determined by speed / wavelength. The longer the wavelength, the lower the pitch. Lastly the height of the wave is its amplitude. The amplitude determines how loud a sound will be. Greater amplitude means the sound will be louder.
  25. jwdiehl88


    That's really cool how one has to lean to the side with their weight and they will cause the normal force to be at an angle that causes the sled to turn.

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