# jacmags

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1. ## physics of silly games

A slinky is an extremely fun toy if you are 3 years old, or even 73 years old! The way it transfers energy back and forth throughout it is very similar to a wave. A wave can either be longitudinal or transverse, but in this case, a slinky is like a longitudinal wave. It bunches up at some points, but then expands out with different distances between each metal ring. Waves are found in every day life such as jump rope as well. As you spin the rope constantly around, it represents half of a wave. If you were to play the "Jumping over the rope game" as we used to call it in the olden days, waves are traveling through that rope even more. As you get a steady pace on the rope, more waves are in it. If we wanted to find the speed of the rope, you could use the equation v=fh( h=wave length). You would measure the rope and then calculate how long it is and how long it would take for the wave to hit the crest 10 times. This would give you the frequency and wave length of the wave. Waves are every where and can be tons of fun!
2. ## Physics of Catching Skittles

The other day my team and I were messing around and were throwing skittles into the air and trying to catch them in our mouths. If we missed slightly, the skittles would hit our tooth and it would KILL. I saw all of the physics involved with it and knew why it hurt everyone's teeth. The skittle hit our teeth with a force and the impulse exerted the force on it and there was no time for the impulse to be spread out therefore causing more work to be done. The velocity that the skittle was coming at had both horizontal and vertical velocity. The skittle first went up in the air, then came soaring back down to where we could catch it. When the skittle reached it's highest point in the air, the velocity was 0. It then built up more vertical velocity due to gravity because the acceleration of 9.81 m/s^2 caused it to speed up. The change in velocity is what caused the impulse of the skittle which in turn made our teeth hurt. We would have been able to find the velocity of the skittle if we timed how long it was in the air for, and the distance from its highest point to our mouth. By using those variables and acceleration due to gravity, we could find out what the velocity was. Skittles are my favorite so the tooth ache was definitely worth it.
3. ## Lacrosse games

Since it is now lacrosse season, games have begun. Within the game, physics takes place everywhere; especially on the bench, where I am! I get to stand on the sidelines and watch the game but there is so much physics involved with that. First off, I exert a force on the ground with the same magnitude of force that it forces up on me. This way, I do not go right through the ground, I am safe and secure on the sidelines. I am also facing a force downward on me which is gravity. It pulls me down 9.81 m/s^2 which is good because I wouldn't want to accidentally float onto the field! Also, I do a lot of cheering on the bench. Sound waves travel all throughout the game as I scream for our team. Along with that comes different amplitudes and frequencies. The more we win, the lower frequency comes out. The pitch in turns becomes higher. Playing left bench is very exciting because I get to have physics involved in everything that I do.
4. ## Waves in dancing

I was busting out the funky moves the other night and realized all the waves that were involved! Not only was the true wave involved (the dance move of course), but also sound waves! The speaker was blasting and I was jamming out to "Trap Queen" by Fetty Wap and noticed the changed in frequencies of the song. It would have a higher pitch along with lower pitches due to a change in the frequency of the waves. I turned the speaker up even louder when the beat dropped which caused an increase of the amplitude in the sound wave. Thank goodness for physics because I need to be able to just let lose and dance!!
5. ## Projectile Motion

Tonight was the first night of my trip and our team decided to go out for Hibachi. I have never tried Hibachi before and come to find out, I never should have tried it. After we all ate, I started feeling sick. When we got back to the hotel, I learned a whole lot more about projectile motion. I ran in to the bathroom and realized how much projectile motion can affect ones life. With the vomit, there was TONSSSS of horizontal and vertical velocity. The rice moved the distance to the toilet in a certain amount of time (t) with a certain velocity. If i wanted to find the speed of the projectile rice, I could time how long it took the vomit to reach the toilet from my mouth, then measure both the vertical, and horizontal distance it needed to travel, and we already know that the vertical acceleration is 9.81 m/s^2 downward due to gravity. I wasn't too concerned about the speed however, I just needed to find a place for my projectile motion to go as fast as I could! Not a very fun night in Florida, but it was so warm I didn't even mind it.
6. ## Packing a suitcase

As I packed for my tournament in Orlando, I was trying to squeeze all of my clothes into my suitcase without breaking it. When i pushed down on it, the suitcase pushed right back up at me because I had so many clothes stuffed in there. When I thought about it, the suitcase acted like a spring! A spring compresses and then expands just as my suitcase did. However, there is no "constant" within the suitcase as there is in a regular spring. The suitcase also required me to do work. I had to use energy in order to close the suitcase but at the same time, the suitcase was also doing work on me. Every object presses back on the other object with the same magnitude therefore, the suitcase did work on me. There is physics in everything!
7. ## Weight lifting at Pcx

I go to a work out facility in Webster called PCX. Here we do a lot of weight lifting and agility. When I was there this week, I saw all the physics involved in weight lifting. When doing a hang clean, I must exert a force onto the bar in order to lift it up. As I exert a force in it, the bar exerts the exact same force onto me. Along with me putting a force onto the bar, I must do work on it. When I lift it up, I do work on the bar but when the bar is coming down, it is actually doing work on me. Gravity acts on the bar which in turn causes the bar to do work on me. Also, I must lift the bar with a certain amount of power. The power applied to the bar is the work/time. If I lift the bar faster, I will be lifting with less power. However if I do more work on it, the power will be greater. When we run, we also incorporate physics. When we sprint, we start with an initial velocity of 0 but as we do more work, our speed increases and we go farther and faster. If we accelerate faster, our final speed when we sprint will be greater. Also, we will have more momentum. The momentum equation is P=mv therefore, if we go faster, our momentum will be greater. Pcx is filled with physics and you can increase your performance just by knowing basic physics.
8. ## Weight lifting at Pcx

I go to a work out facility in Webster called PCX. Here we do a lot of weight lifting and agility. When I was there this week, I saw all the physics involved in weight lifting. When doing a hang clean, I must exert a force onto the bar in order to lift it up. As I exert a force in it, the bar exerts the exact same force onto me. Along with me putting a force onto the bar, I must do work on it. When I lift it up, I do work on the bar but when the bar is coming down, it is actually doing work on me. Gravity acts on the bar which in turn causes the bar to do work on me. Also, I must lift the bar with a certain amount of power. The power applied to the bar is the work/time. If I lift the bar faster, I will be lifting with less power. However if I do more work on it, the power will be greater. When we run, we also incorporate physics. When we sprint, we start with an initial velocity of 0 but as we do more work, our speed increases and we go farther and faster. If we accelerate faster, our final speed when we sprint will be greater. Also, we will have more momentum. The momentum equation is P=mv therefore, if we go faster, our momentum will be greater. Pcx is filled with physics and you can increase your performance just by knowing basic physics.
9. ## Hitting in volleyball

Volleyball has so much physics involved its crazy. With every basic component of volleyball comes physics. One of the more exciting parts of volleyball is hitting, and without physics there would be no hitting! With hitting, the player jumps into the air and at her highest point she contacts the ball. When the hitter is about to jump, her initial velocity would be 0. Then, she must do work in order to reach the ball to hit. Work=Force(distance) therefore, the hitter must at least exert a force of whatever her weight is on to the floor in order to jump. If the player wants to be in the air for longer and higher, she must do more work. As the hitter is at their highest point, their gravitational potential energy is the highest and then that energy changes into kinetic energy. Energy is never lost or created it is simply changed. When the hitter makes contact with the ball, she applies a force to it that gives it velocity both horizontally and vertically. If the hitter exerts a greater force on the ball it will have a greater acceleration causing it to go faster and hopefully result in a point!
10. ## 22 Jump Street

Recently I have just watched the movie 22 Jump Street. As i was watching, I noticed all of the physics involved in the movie. During the movie, Channing Tatum was shooting a gun and I saw all the physics behind it! The gun and the bullet inside of it both had momentum before and after it was fired. P(Momentum)=mv so when the gun was not shot yet, the momentum was 0. However, once the bullet was fried, the bullet had momentum and the gun had a recoil which had momentum. When the bullet was fired, it had both a horizontal distance and a vertical distance along with speed and velocity.You could measure the horizontal speed of the bullet by first finding the time it took to reach the ground by using the vertical components. Also in 22 Jump Street, the two characters were free falling from a helicopter until they hit the ocean. They were both falling down with an acceleration of 9.81 m/s^2 and then hit the water where their momentum changed. Although water seems like a reasonable place to jump in to, falling from 300 feet would not turn out well. The force the two hit the water with would have caused some injuries but because it was a movie, they were fine!
11. ## The Physics of roller coasters

With every fun activity comes physics! At any amusement park, physics is everywhere. When on a roller coaster, energy is changing all throughout. When a roller coaster has come to the highest point on the tallest hill on the whole ride, the cart will have the greatest amount of potential energy. The potential energy equation is PE=mgh therefore, potential energy will always be greater when the roller coaster cart is higher. As the cart gains speed, its kinetic energy will increase. The kinetic Energy formula is KE=1/2mv^2. When the cart is at its lowest point on the track after coming down from a hill, it will have the greatest kinetic energy. While the potential energy and kinetic energy are constantly changing, the total mechanical energy always remains the same. Energy is just changed but is never lost.
12. ## Physics of Volleyball

I love the way you connected one of your favorite things to physics!
13. ## Shattering my phone screen

The other night, as I got out of my car to go to training, my phone fell out of my pocket and hit the pavement. In result, the entire screen became completely shattered. You could say this was just a misfortune of luck, but it is actually all physics. As my phone was just about to fall, it had a certain amount og gravitational potential energy. Once it began to fall, the energy changed into more Kinetic energy as the phone began to speed up before it hit the ground. The closer to the ground it was, the more kinetic energy it has and the less potential energy it has. The gravitational potential energy is mgh so as it got closer to the ground, the PE would decrease. Kinetic Energy is 1/2mv^2 which means as it sped up getting closer to the ground, the kinetic energy increased. Not only did the energy change, but when the phone contacted the pavement, it experienced an impulse. The change in momentum and force put onto the phone caused the screen to crack. It was unable to spread out the force for a longer time causing the screen to shatter. It is a tragedy that physics did this to my phone.
14. ## Physics of a Ukulele

That is so unique that you know how to play the ukulele! Did you teach yourself? Nice job connecting music to physics!
15. ## Physics in Running

Thank GOD for friction!!! We wouldn't want you to slip and hurt yourself
16. ## Physics in Volleyball

I'll miss you next year mindy
17. ## Physics of Sitting

This morning as I did my usual routine, I brushed my hair and then realized all the physics involved in it. As i was sitting at rest in my chair, i remembered that if i was to remain there forever without any force acting upon me, i would stay at rest forever. Newton's 1st Law states that and object will remain at rest unless acted upon by a net force. Also, the chair and myself created an equal force upon each other. Newton's 3rd law states that all forces come in pairs and if an object exerts a force on another obect, the other object exerts the same exact force just in the opposite direction. The chair exerted a force on me and I exterted an equal force back on the chair even through I was at rest. Also, the magnitude of the forces are exactky the same even though the chair and my mass are different. The forces acting upon me and the chair are completly equal. Gravity pushed down on my while the chair pushed a normal force upwards. The force of gravity and the force of the chair were equal while I was sitting.
18. ## Driving on a Road Trip

I loved it! I stayed with the team and talked with the coaches so it was a good weekend!
19. ## Driving on a Road Trip

This weekend my family and I took a trip down to Fordham University down in the Bronx. As I was driving, I realized all the physics involved in the trip! The car was traveling at a constant speed of 70 miles per hour when it was set on cruise control. On the thruway, the car was only traveling horizontally therefore, it had no vertical distance. the car remained on a straight path where only the horizontal distance was changing. It took us about 5 1/2 hours to get all the way to New York city. Over that time and at that constant velocity, the total distance could be calculated. However, due to traffic and speed limit changes, the car was not traveling at a constant velocity the entire time. Newton's first law states that an object in motion tends to stay in motion unless acted upon by a net force. If I were to stop pressing the gas pedal, the car would continue to move along due to Newton's Law. The friction of the road acts as the net force of the car and would cause the car to eventually stop moving.
20. ## Jumping in Volleyball

With volleyball, jumping is a key component to the sport. A hitter must be able to jump to reach the ball and hit it. Physics also applies to jumping. As a player jumps, the player is traveling up into the air for a certain amount of time until it hits their maximum height, and then comes down at the same velocity as they traveled upwards. Due to gravity, as the player jumps upward, gravity is acting upon its and pulling them downward at 9.81 m/s^2. Also, Newton's Third Law is also used in a players jump. Newton's 3rd Law states that all forces come in pairs and that object 1 and 2 exert identical forces on each other. As the player pushes down to jump, the ground pushes upwards with the same force that the player had applied.
21. ## Jaclyn's Blog: Volleyball

Hi everyone! As most may know, I am a volleyball player and I have come to realize physics apply to volleyball in so many ways. With serving, physics plays a major role in the way the ball moves. When the ball is first contacted from the hitters hand, it has an initial horizontal velocity along with a vertical velocity. As the ball travels over the net, it has a vertical acceleration of 9.81m/s^2 when it has left the servers hand. Gravity pulls the ball down to the floor and increases its velocity as it gets closer to the earth's surface. Volleyball and the motion of the ball has all to do with physics!
22. ## Speeding Lab- Jaclyn, Annie, Trevor, Isaac

Jaclyn, Annie, Trevor, Isaac
23. ## Introduction Paragraph

I can't wait to have this volleyball season with you Ky! We can work on physics together at games!