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jdemers50

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  1. jdemers50
    Hey folks, breaking news, size doesn't matter. 100% of astrologists agree that a more massive planet doesn't necessarily have a larger gravitational force. Take Uranus for example, it very massive compared to us here on earth. In every way Uranus is larger than Earth, radius, mass, surface area, and volume. However because of earths smaller radius it has a larger gravitational force. The equation for gravitational force is F=G(M1M2/r2). The gravitational field on Uranus is 90% of that on earth. If you weigh 180 lbs on earth, ya gonna weigh 162 lbs on Uranus, pretty cool stuff. 
  2. jdemers50

    An Harmonica

    By jdemers50,

    The harmonica is by far my favorite instrument, I love the different types of music that can be played on it as well as the many different characters you find playing it. Recently I have been teaching myself how to play a harmonica and have been wondering the physics behind it. In each hole of the harmonica there lies a reed, all of which are different in size. When you breathe into the harp of the harmonica the reeds vibrate at different frequencies causing the different pitches you hear. Each reed is fastened to the reedplate with one screw, allowing the rest of the reed to vibrate freely. The harmonica can be very simple and some of it can be very complex. Once you become proficient at the harmonica you can learn how to bend notes and master the harmonica. 
     
  3. jdemers50

    Curling

    By jdemers50,

    Ever wanted to know the physics of curling??? NO???? Well to bad im gonna tell you. Curling stones are made from thick granite stones, weighting about 20 kg, with a handle on top. The heavy mass of the stones makes it so it doesn't slow down early. The sweeping of the ice before the stone reaches that spot decreases the friction of the stone with the ice. The little bit of friction caused by the front of the stone melts the ice a tad and creates water which reduces the friction. By controlling the friction between the ice and stone you can perform curling. 

  4. jdemers50
    Crossbows are a very a cool weapon. They use tension and potential energy to shoot arrows. You first pull the string back, which requires a large amount of force, lock it in place with the spring system and then pull the trigger which drops the lock and sends the string and arrow launching forward at a high velocity. When the string is pulled back and locked in place, potential energy is built up. The more potential energy that is built up, the faster and stronger the arrow will launch once the trigger is pulled. Crossbows are fairly simple, yet very deadly. 

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