• Content count

  • Joined

  • Last visited

Community Reputation

0 Neutral

About jwdiehl88

  • Rank
    Advanced Member
  1. 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. *work in process
  2. 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.
  3. 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.
  4. 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.
  5. Oh so that is probably why people take their earrings or remove any metal piece off their body before they get a MRI.
  6. 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.
  7. 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.
  8. 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.
  9. 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.
  10. 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.
  11. 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.
  12. 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.
  13. I have horrible eye sight, so that's why I need glasses to see better. And yet I never really understood how a mirror could make you see better. Until last year, when we learned in physics of optical glasses. Our eyes are concave, and the distance between our cornea to our retina is the focal length. So the light that hits our eyes allows us to see images. People who have twenty/twenty visions have eyes that aren't small or elongated and the focus is at the retina. This allows people to see images clearly. However people who have bad eye sight can either be far-sided or near-sided. The people who are far-sided, have their focus behind the retina because the eyes are short, therefore convex lenses can fix this. Convex lenses has a positive focal length which moves the image of a person far-sided forward. People who are near-sided, have their focus in front of the retina because the eye is elongated. Concave lenses can fix that because tit has negative focal length so it moves the image back to focus.
  14. I guess we can say that Lebron James wasn't a flopper through the use of physics! Draymond Green had an force big enough to knock down Lebron James, so Green should have been given the foul.
  15. Watching the summer Olympics last year was really intriguing because of the High Jump. I have always wonder how someone with just a pole could jump so high above a bar. Now I know there's physics behind it. First of all, before the person jumps above the bar, the person with pole has to generate speed to the high bar. This speed generate before the person jump increases the kinetic energy of the person. Then the person plants the pole down at an angle and jumps, the person is then able to be at the highest trajectory of their motion. Additionally, the kinetic energy of the person is then transferred into potential energy causing the person's height to increase. This allows the person to jump at a high height and be able to be at the highest point of its trajectory. The hang time of the person in the high is due to the pole's elasticity. The pole bends then whips the person to the bar, causing the person to have a longer time in the air. Then the person has to arc their backs to get over the high bar. Then they land on the soft pads to help their landing because it increases the time of the force impacting the body causing no harm to the body.