# hannahz's Blog

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## Physics of Speakers

Speakers contain an electromagnet which is a coil of wire that the current flows through. First, it starts with a battery and then moves into the coil of wire. When the magnet vibrates the air molecules start moving and create waves. The waves then produce the sound that you can hear. Also there is energy transfer in a speaker. For example, the phone has electric and chemical potential energy because its a chemical reaction that causes the electricity to flow. Chemical turns into electrical and

## Physics of a surfer

When a surfer is waiting to go, there are 2 forces that affect the surfer. For example, there is gravity which pulls the surfer down and normal force going up. If you were to find the net force it would be equal to 0. When surfing, it is important to maintain balance. When the 2 forces are in line and add to 0, then the surfer is stable. However if one slides backwards on the board, the downward force of gravity moves behind the normal force. Also when the wave approaches the beach, it is a tran

## Physics of a Slide

During the spring and summer time many kids beg there parents to take them to a local playground or park. Or sometimes they have a play set in their backyard. Just like riding a bike, going down a slide includes lots of physics. For example, gravity is one of the most common physics element in riding down a slide. When someone sits on top of the slide, gravity is the force that pulls the person downward. Ever get that feeling that you're going to slide right down the slide the minute you sit dow

## Physics of Riding a Bike

As spring is starting to approach us, many kids want to get out and start riding their bikes. However, what some kids don't know is that riding a bike involves physics. When you are riding your bike, you start by going very slow; however, as you begin to pedal fast, you speed up, that's called acceleration. When you start traveling at normal speed, you don't have to continue pedaling as hard. This means that you're just traveling at a constant speed which means that you're not accelerating. Also

## The Physics of a Roller Coaster

When riding a roller coaster, gravity is one of the main forces. When the cart on the roller coaster travels to the top of the hill, its the acceleration due to gravity that brings it back to the start. When the cart gets to all the way up to the top of the hill, gravity ends up pulling it down. The cart starts at a slow pace but gets faster as it approach's the bottom. As it begins to climb to the next hill, the speed slows down. This is because the acceleration due to gravity is 9.81 m/s^2. As

## Physics of football

With the superbowl coming up, football is all thats been watched at my house. As i was watching one of the games, i noticed that there is a lot of physics during a football game. For example all three of Newtons laws are used during a football game; however the one that i noticed the most was newtons first law. Newtons first law says that an object in rest remains in rest unless acted upon by an outside force and an object in motion remains in motion unless acted upon by an outside force. For ex

## Physics of driving

It comes a time when everyone turns 16 and it's finally time to get behind the wheel and start driving.After taking a closer look, I realized that Newtons Third law applies to driving a car. For example, Newtons third law states that every action has a reaction. This applies to driving because when someone is driving the action is when the car is pushing agaisnt the road and reaction is when the road pushes agaisnt the car's tires. Now lets say you (by accident) hit a person, when you hit that p

## Physics in sledding

There is more and more snow that is falling from the sky and many people take the chance and go outside and go sledding. However what many people dont realize is that sledding involves alot of physics. For example, Newtons first law, says that an object in motion will not change unless acted upon by an outside force. In other words an object at rest will stay at rest until a force causes it to move and an object in motion will stay in motion until a force acts on it and causes it to stop. For ex

## Texting and Driving

Almost everyone does it but not everyone knows the acutal effects of texting and driving. Most people are told that being distracted while driving is never a good thing and to always avoid it but do people really know how much texting can affect ones reaction time? If you take an average speed of 30 miles per hour, the average stopping distance would be around 7.5 meters. However if you add in the distraction of texting the stopping distance increases to 17.43 meters. If you were to convert that

## The Physics In a Competition With Your Siblings

Everyone has those days where they challenge their siblings to a race. But at the end of the competition, how do you know who is the most powerful? During physics class, one of the labs taught us that whoever does the most work in the least amount of time is the most powerful. For example, whoever can run up the stairs the fastest wins the competition. Next time you want to have a friendly competition with your sibling, challenge them and tell them you're the most powerful. According to the d

## Physics in a crime

When someone ends up comitting a crime, sometimes a gun is involved. For example last week on a feild trip, i was able to sit into a trial of someone who commited a murder. During that trial they brought up the evidence that the lady was killed with a gun. When they brought up someone to testify, he was a gun expert. He started talking about how the gun must have been shot and how projectiles are involved. I thought it was cool how someone started to bring physics into trying to solve a murder.

## Physics in baseball

Over the course of the srping season I watch my brother play baseball for the school. However a couple of nights ago my family was watching baseball and i realized that alot of physics is in the sport. For example when someone gets up to go and hit the ball, they try to hit it the farthest because they want to be able to run around the bases in order to score. For them to be able to get the ball to go the farthest, they have to hit it at a 45 degree angle. Although they dont always hit it at tha

## Catapult and Physics

Over the course of October, a catapult project was assigned. While my team and I started working on it, i realized alot of physics goes into a catapult. In order to get the catapult to launch the farthest, you want it to shoot at a 45 degree angle. Also when making a catapuly you have to figure out what is the best way to build it so it will be able to shoot the softball the farthest. When building, we decided to make it so that the sides and base were very stable. We figured that by doing this

## What I've Learned

During physics this week, I have learned many new things when it came to free- fall. I learned that the accerleration on the earth is 9.81cm/s/s. I also learned that the weight of an object doesn't normaly affect the rate at which it falls. For example in the lab we did this week, we dropped a 200g and a 500g weight starting from the desk. Although it looked like the 500g weight fell faster, it was only due to air resistance. I also learned that the slope of a velocity and time graph represents

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