# Dannyk17

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1. ## Archery

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. ## Skydiving

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. ## Frisbee

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. ## Harmonics

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. ## 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. ## Elevators

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. ## Aerodynamics [Blog Post #3]

yes max, top gear is awesome!
8. ## Car Spoilers [Blog Post #4]

Wow Max, that's really kool! I wonder if the size of the spoiler itself has any affect the amount of grip?
9. ## My Dusty Story (Cont.)

I hope your ankle gets better soon
10. ## Physics of Disney World

I really want to go to Disney now
11. ## Friction Friction Friction

thanks, I'll make sure to be extra careful while driving in the snow now.
12. ## walkin

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.
13. ## catapults.

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.
14. ## Phsyics in shootin deer

why am I not surprised to see this on your blog?
15. ## soccer

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.
16. ## sleeping

one of my favorite things in the world is sleeping, I'd take sleep over physics homework any day of the week. But I will admit physics is greatly involved in the act of sleep. For instance, while laying on your bed you create an example of Newton's third law of motion: for every action there is an equal and opposite reaction. The first action/force would be you laying on the bed, pushing it downward. The second action/force would be the bed pushing back at you with the same amount of force but in the opposite direction in which you were pushing. Understand how physics pertains to one of my favorite things will definitely increase my interest when having to do physics homework.
17. ## News Letter- Danny Kalke & Tanner Dalton

Amazing! simply Amazing!, students at Irondequoit High School have recently calculated the acceleration of an object due to gravity. they were able to do this through a specialized lab in which one student held a ball to the ceiling while the other measured the distance to the floor. they then timed how long it took the ball to fall to the floor using a stopwatch. after finding the average time of three trials the students used a kinematic equation to find the acceleration of the ball( d=ViT +1/2(A)(T)^2). once found the acceleration was used in the percent error equation to find the difference between the calculated value and the accepted value(9.81m/s^2). There have been rumors that these same students also found a way to measure one's jumping displacement.
18. ## Its me.

"I will basically eat anything" - Dan Vanill - words to live by
19. ## Seth's intro

I'm assuming that you are a terrible referee.
20. ## Danny's intro.

My name is Danny, I am a junior at Irondequoit high school. my interests include playing soccer, walking my dogs, Murray and Charlie, and eating. My favorite food has to be milkshakes because they're milkshakes and milkshakes are great. The reason I am taking Physics is to gain more experience for college and to expand my overall knowledge of science.
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