# ally_vanacker's Blog

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## Doppler Effect

On the show The Big Bang Theory, Sheldon goes to a Halloween party and dresses as the Doppler effect. he explains his costume to people by giving them the definition "its the apparent change in the frequency of a wave caused by the relative motion between the source of the wave and the observer". throughout the episode he also makes the noise of a car going by when people try to guess what his costume is. This noise he makes is a clear example of the Doppler effect because it sounds louder in th

## Working out and Physics

Knowing physics can help you improve your work out! I go to the gym a lot after school and everyone is always on the treadmills and a lot of people just walk with the incline of the treadmill up high. Some may think walking is a pretty easy work out and wont do much, but because of physics, if you add an incline or walk up a hill you actually are doing a lot of work. as you walk up a hill, the gravity pulling you towards earth's surface goes up which forces a person to do more work to walk up th

## Police use Physics too

While driving on the expressway I have passed by many police officers and like everyone around me, slowed down the second I realized it. The radar guns police use, use physics to help find out if the driver is going too fast. As the police officer aims the radar gun at cars passing by, the gun sends out radio waves toward the car. Then, the radio waves hit the car and bounce back toward the gun. The gun then measures the frequency of the returning waves, so the faster you are going toward the po

## Inverse Doppler Effect

While researching and learning about the Doppler effect I came across the idea some people have that there is an inverse Doppler effect. Researchers from Britain did an experiment in the early 2000's trying to prove that the Doppler effect could be reversed. They did this by creating a pulse that acted like a siren and then using radio frequency to see the waves. This was done on structure called a nonlinear transmission line that used magnetics and created a new type of wave. They observed that

## Whale Sound Waves

Sound waves can help whales hear each other and communicate under water. Since the medium of these waves is water, the sound waves can travel much faster than humans talking on land. Medium is the main thing that can affect wave speed so whales are able to communicate quickly and other animals underwater also can too. Also, as the depth of the ocean increases as the whale goes further down the water gets colder which causes the speed to decrease. Temperature and pressure changing throughout the

## Everlasting Candy

Everyone loves candy and physics can make the candy eating experience longer! Physicists did a study with hard candy and found that the candy dissolves linearly. This means that the rate in which it dissolves stays constant instead of accelerating at any point. Therefore, if you keep each candy in your mouth without biting on it, each piece should last about twenty five minutes. This shocked me cause one tiny skittle doesn't feel right to take almost 30 minutes to eat. From this experiment, I th

## Throwing a Phone

I recently found out that it's proven that you can't throw your phone in the air without it flipping the short way at some point because of physics. I've never learned about this concept before but I did some research on the always trustworthy google and got an answer on why this is. The axis theorems in physics force this to happen because of the difference in inertia from when the phone is the long compared to the short. Because you are not flipping the phone perfectly along the axis it deviat

## Physics Notes

This quarter I put in place the not strategy of drawing pictures and being more creative while note taking rather than just getting through it and not getting much out of it. I enjoy drawing and making little doodles so this seemed like a fun idea when it was introduced to me in class. The best part about it was it honestly did help. I had fun making it look good which made me spend more time focusing on physics and watching the video in greater detail. Before I did this it was easy to just skim

## Centripetal force

One day I took my little cousin to the zoo and while we were in the monkey house getting out of the snow he saw the big yellow circle and wanted to throw a coin in it to see what it did. While it spun around all I could think about was physics class and how we learned about centripetal acceleration. When we first dropped the coin it went slowly around in a circle and then it kept speeding up as the radius got smaller. This proves the equation of v^2/r to be very accurate because by the time the

## Physics in driving

I recently passed my road tests and have had many experiences while driving with the physics we have talked about in class. For example, when I took my test it was snowing and the roads were very icy. This made it harder to drive because the conditions of the road created less friction on the tires making it harder to stop. Another thing that has proven to be true while driving is Newton's third law which is that every action has an equal and opposite reaction. I'm nothing close to being a good

## Crazy Catapult

While looking back on last week, our catapult taught me a lot about physics and also allowed me to use my problem solving skills. The catapult taught me about what angle to have the ball launched at, how adding more force to the catapult would make it go further, and also how height and speed affects the outcome of the catapult's results. But getting to the end result on Thursday was a result of loads of frustration and struggle. For example, Kylee, Grace and I had many trials and errors through

## The Bunny Hop

The highest a rabbit has ever jumped is 99.5cm in Denver on June 28th, 1997. to convert that into meters the measurement would be .995cm. from this information I gathered I also know that at the moment the bunny began to jump the initial velocity was 0m/s. also, since the bunny jumped on Earth I know its vertical acceleration had to be 9.81m/s^2 due to gravity. From all this information I can find how long the rabbit was in the air for. By using my three variables, I can use the d=vit+1/2at^2. B

## The Volleyball War

Typical Kylee and Mandy are always going back and forth and one day decided to fight and pulled the net when they should have been setting it up, with good old Quinn trying to get them to stop. This created two tensions pulling on the net- Kylee and Mandy- and Quinn in the center being "the dot" motionless in the center. Kylee, being taller and weaker, pulled the net at a 30 degree angle above Quinn with a force of 30N. While Mandy, being shorter and stronger, pulled the net at an angle of 20 de

## Volleyball Physics

Physics can be seen in every sport. To start off, physics can be seen in the first second of a volleyball game when the ball first rebounds off the hands of a player during the first serve of the game. Factors such as, how good a server is, where the ball is being served to, and how high the serve goes was taken into account as I did my testing of how long it took the average volleyball player to serve a ball to the center of the court. By using a stopwatch and various trials I found the average

## Everyday Physics

Throughout the day I have started to realize that physics is part of everything I do. When I wake up in the morning and my alarm goes off I usually follow Newton's first law and stay at rest for a little while. Once I finally get out of bed I use heat to cook food so I can have a good breakfast before school which is using thermodynamics. Next, I get ready and drive to school. While driving I realize that gravity is keeping my car on the road and the normal force of the road is pushing back on m

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