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About Dannyk17

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  1. Dannyk17


    we are starting the archery unit in gym and I was wondering what the physics we behind it. I did some research and I found some pretty cool stuff about it, I found that when aiming archers generally aim to one side of their target and the arrow straightens out during flight. the arrow is able to straighten out because the fishtail at the end of the arrow oscillates causing the arrow to move back towards the center.
  2. Dannyk17


    I was watching television the other day and I saw a commercial of someone skydiving, this got me thinking that there has to be physics behind it. I learned that the physics of skydiving involves the interaction between gravity and air resistance. a skydiver keeps accelerating downward until he or she reaches terminal speed, the speed at which the air resistance on the skydiver equals the force of gravity acting on him or her.
  3. Dannyk17


    I was at the park the other day and saw a few people plying Frisbee, and this got me thinking, just how does a Frisbee fly? I learned that once in the air the Frisbee's unique shapes allows to gain lift and angular momentum allowing it to stay in flight. I also learned that Newton's third law plays a vital role in a Frisbee's flight. the Frisbee forces air down and in turn the air forces the Frisbee upward.
  4. Dannyk17


    we have been talking about sound waves a lot in class recently and how they are found in music. I did some research of my own and they really are. I learned how guitar strings have a specific frequency in which they will naturally vibrate and are known as harmonics. I learned that if a guitar only had a single frequency it would make only one sound but because it has so many harmonics present it is able to produce different pitches and thus different sounds
  5. Dannyk17

    Breaking glass

    in class we recently watch a Mythbusters in which they tested whether or not a human can shatter a glass with their voice. to my surprise they were successful, this sparked my curiosity for the topic. from looking into it I found that the singer wasw able to break the glass unassisted with a combination of matching the glasses natural frequency and by using the right level of amplitude for his own. I found that by enacting these two variables onto the glass the effect would be resonance. the singer's voice would cause the glass to vibrate so much so that the glass would shatter.
  6. Dannyk17


    seeing as how I always struggle with elevator problems so I decided to do an entry on them to help with my understanding of them. when accelerating upward in an elevator, a persons inertia wants to stay put so it results in a greater force between the scale and the person. because of this the normal force is larger and the weight is larger. when accelerating downward in an elevator, a persons inertia still wants to remain put so it results in a lesser force between the scale and the person. therefore the normal force is smaller and the reading on the scale is smaller.
  7. Wow Max, that's really kool! I wonder if the size of the spoiler itself has any affect the amount of grip?
  8. I hope your ankle gets better soon
  9. I really want to go to Disney now
  10. thanks, I'll make sure to be extra careful while driving in the snow now.
  11. Dannyk17


    you walk everyday, and yet do you ever stop and think about what actually is going on while you're walking? if it weren't for the friction between your feet and the ground propelling you forward you wouldn't be able to go anywhere. Furthermore Newton's third law is greatly involved in the act of walking. Every step you take is responded by an opposite force coming from the ground, propelling you forward and giving you speed. this is why when you run you have to apply much more force to the ground in order to have a greater force pushed back at you.
  12. Dannyk17


    Through the many trials of creating our catapult, my teammates and I were able to discover the physics that went along with it. we learned that a catapult is able to launch its projectile through either three different stored energy mechanisms; tension, gravity, or torsion. we inevitably used gravity because we thought that it would be the most effective. we used a plastic crate full of bricks as our source of energy to launch the softball. But even though all the bricks greatly outweighed the softball it only managed to go 10 meters. After further analyzing the problem we came to the conclusion that our launch angle was far too great, we wanted it to be around 45 degrees but it ended up being much higher than that. because of this the projectile went pretty high but not very far. if we were to do this project over again we would definitely make our launch angle smaller to maximize the distance of our projectile.
  13. why am I not surprised to see this on your blog?
  14. Dannyk17


    in many ways physics has a lot to do with soccer. for instance, when cutting while running takes a lot of force. Newton's first and third law of motion apply to this action. Newton's first law is applicable here because you continue moving in that direction until you exert a force(your plant leg) to change it. The third law works here because the force your foot is inflicting on the ground is counteracted with the same force but in the opposite direction by the ground itself.

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