Summary 1st semester

This semester I've learned a lot. First of all I learned that I do not like to blog. Overall this calls has been interesting and pretty fun. There is a lot more labs than I expected but more homework than I expected also. This class is nothing that I expected it to be. I thought there was going to be a lot more equations and more note taking than activities. Another thing I learned is the many different scenarios physics can be used in. The different stories told in equations make the problems interesting and makes you think how it can actually be applied. The blogs also helped visualize the different in world physics scenarios we live through every day. The one thing I realized that was important in class was the tests. One test can majorly bring your grade down or bring your grade up. In the beginning of the class I hated it, on the first quiz and test I scored low and had a low grade for a while. How do I feel about it now, I still really hate it because there is so much other work we do and it feels like it is a waste of time when it doesn't make to big of a difference in your grade. I'm also not a very good test taker so most of my test scores are not very high. I posted this picture because it takes us back to the beginning. As you recall this is the first picture I posted when I talked about myself. This is because we're going back to the beginning to see how far I progressed from the start. Out of all the sciences I took since I got into this school, this class is my favorite. To me it makes the most sense and I can apply it more to real life situations than the other sciences. In BSCS we learned about DNA and things that composed are body, in chemistry we learned about atoms and molecules none of these items can we see with the naked eye. So far this class is going pretty good and I'm understanding most of the concepts and equations we have to do. I just wished that the tests and quizzes weren't graded so much. And one of the only PA assignments that I did not turn in on time was worth like four times the amount as usual so that kind of sucked and the blog is blocked during Sunday nights. Other than that this class is going by pretty good and one of my more interesting classes.

Egg Drop Lab

During class we did an egg drop lab. The objective of this lab was to make an object to protect an egg from a four story building drop. The rules were that we could not use parachutes and that we could not put anything on the ground level to land on. What I did for my design was to use a juice carton as the main capsule. In that was another capsule holding the egg, which was surrounded in cotton. On the bottom half of the carton was cut slits so that when it hid the ground, it would collapse and increase the impact time. On the bottom of that was a taped juice can (full). this was so the center of gravity was on the bottom and would drop straight. Our design did not work, this was because the object was too heavy and it did not the juice carton did not collapse enough. this could have been solved by having a bigger surface area and making something to collapse more.

Definition of Momentum

This unit is about momentum. Momentum is defined as inertia in motion. The units of momentum is kilograms meter per second. This can be represented as P. the law of conservation of momentum states that momentum cannot be created nor destroyed, it can only change forms. The equation for this is Pin= Pout. Meaning momentum in equals momentum  out. Impulse is the change in momentum. When to objects collide there are two types of collision elastic and inelastic. Elastic equations are bouncy and inelastic collisions are non bouncy or sticky. In class we did a lab for this with toy cars. We had a collision with velcro and a collision without velcro. From that we found that momentum was not lost in the collision. It was just transferred from one equation to another. Force is found by the change in momentum divided by the change in time.

Forces #3

Today I will be talking about force for the third time. Again force is defined as a push or a pull. Force is measured in newtons which kilograms meters per seconds squared. this time I will be focusing on Newton's third law. It states for every action there is an opposite and equal reaction, this law is also known as the action reaction. For example while you are on earth and you jump upward, the gravitational pull of the earth pushes you back down. Therefore the forces acted upon you are balanced. A balanced net force is a force that is in equilibrium so that it is not accelerating. We are able to show these time of equations with free body diagrams. This is resembled by a circle, being the object, and arrows which represent the forces being exerted on it.

Forces #2

A forces is defined as a push or a pull. Today I'm going to talk about interita. Inertia is defined as an objects's ability to continue in the state is in. Inertia is proportional to the object's mass. For example if a bowling ball was to roll compared to a marble, the bowling ball would have more inertia than the marble. Newton's first law is the law that deals with inertia. It states that an object in motion will tend to stay in motion unless acted upon by an outside, unbalanced force. The same thing goes for objects at rest. Objects at rest will tend to stay at rest unless acted upon by an outside unbalanced force. An example of this is friction and gravity. Nothing on earth goes on forever because friction and gravity exists.

Work

In class we are now working on "work" which is the change in energy. I took a picture of my speakers to display work. I chose this because it was unique and I don't think people realize what is happening to make sound. Something is working when it is working against a force. For instance if you were to just hold a book in one place it would not be considered work. Now if you were to move your arms up and down it would be work because it would be working against the gravitational pull. For the speaker scenario, the speakers don't look like there doing much but it is. When it makes noise and music the speakers work against air resistance which create different frequencies. 

Momentum #3

Momentum is inertia in motion. The more weight there is in an object the more momentum it is going to have. To find weight the equation is mass times gravity. There is a rolling bowling ball in the picture I took. The bowling ball which is thirteen pounds would be much harder to stop than a golf ball. The bowling ball would also be harder to stop because there is less friction on it than there is on a golf ball. Therefore the golf ball will slow down faster due to friction. The safest way to stop momentum is by using more time. For example if you were to get punched in the face it would hurt less if you were to go with the punch instead of moving your head into the punch. Same thing here, the force would be much greater if you were to stop it all at once, instead of slowing it down gradually.

Momentum #2

Momentum is inertia in motion. In class we have studied how momentum affects the collision between to carts. When the carts collided with each other they transferred their momentum to each other. I took a picture of someone getting hit by a giant exercise ball. The momentum from the ball was transferred to the guy's face. Since the ball was flat the impact was not as great. It took more time for the ball to completely come at rest, therefore the force was not as strong. If the ball was not flat the entire momentum of the ball would hit him at once. It would be similar to the experiment of the lighter car in motion colliding with the heavier car at rest. Fortunately the momentum was distributed little by little so no one got hurt.

Forces and Newton's Laws in Equilibrium

This unit is about Newton's laws and forces in equilibrium. His first laws states that an objects ability to continue in the state it is proportional to the object's mass. In this picture it is a glue stick rolling on a table. Since a glue stick does not have much mass it will not roll as much as something like a bowling ball. Also since it is round friction does not have as much affect as it would on an object like an eraser, where it would stay at rest after you push it. As you can see Newton's first law of inertia holds true and that it is proportional to an object's mass.

2D Kinematics #2

2D kinematics is the study of motion on the x and y axis. Here I have a ball in motion about to bounce. 2D kinematics are in our every day lives, such as jumping. But how do we know where this ball is going to land, most of us can tell by experience and by estimating. To find our answer mathematically we would need to find the acceleration in the x and the y axis, we would also need to figure out how long this object is in the air. From that we are able to tell how far the object will bounce from the previous spot. We did an experiment similar to this in class by rolling a ball of a ramp onto the table and finally on to the ground. We predicted how far the ball would land from the table by using these a couple of equations.

Kinematics #3

This is another post of kinematics, which is about objects in motion. In this picture it is a eraser ball rolling on a table. This is different from the bouncing basketball because the basketball had an acceleration in the y and x axis, while this eraser ball only has an acceleration in the x axis. It doesn't mean that gravity is not important, gravity is always on but the acceleration in the x axis is what is important. When the ball rolls off the table then it will become 2D kinematics because gravity then plays a factor as well as the acceleration in the x axis.

Kinematics #3

This is another post of kinematics, which is about objects in motion. In this picture it is a eraser ball rolling on a table. This is different from the bouncing basketball because the basketball had an acceleration in the y and x axis, while this eraser ball only has an acceleration in the x axis. It doesn't mean that gravity is not important, gravity is always on but the acceleration in the x axis is what is important. When the ball rolls off the table then it will become 2D kinematics because gravity then plays a factor as well as the acceleration in the x axis.

Kinematics #2

Kinematics is the study of moving things. In the this picture there is a shoe rolling on the table. Kinematics is different from 2D kinematics because the object is only moving on one axis. In this case the shoe is only moving on the x axis. Because this object is moving on the x axis gravity would not be the acceleration, instead it would be how fast the object is moving forward. This is important in life because if we if the acceleration was fast enough the shoe would have had fallen, although it is not a far drop in life it is important.

2D Kinematics

2D Kinematics is when something moves on the x and y axis at the same time. In the picture I took there is a basketball in a room. It has just landed from moving upwards and left at the same time. This relates to 2D kinematics because it is moving on both axis at the same time. Which also means that there are two different accelerations because of the two directions it is moving. Most things in real life move on both x and y axis. For example when you shoot a basketball you need to shoot it at a certain angle and power for it to go in the hoop.

Vectors

A vector is described as how far as how far and in what direction something moves. The difference between vectors and distance is that vectors show what direction it is moving. For my example I took a picture of a tennis ball in motion, which you can barely see in the middle of the screen. The ball is accelerating 9.8 m/s squared because of gravity and toward the negative direction in relevance to the x- axis.

Acceleration

This week we have been working on acceleration a lot. We have done the ball toss lab and defined several graphs and what they mean. The picture I took is from a pool table. The cue ball was shot and broke up the balls in the middle. The cue ball accelerated toward the rest of the balls and came to a stop by accelerating backward. The cue ball then transferred the force to the other balls causing them to accelerate in different directions. The other balls then either fell in a pocket or hit the rails causing them to slow down and then stop. This happened because the balls accelerated in the opposite directions causing it to slow down or stop.

Unit 2: Fan

For Unit 2 I decided to take a picture of a fan. This has everything to do with Unit 2 because of all the moving parts in it. I thought this was very appropriate for because a fan is pretty much only moving parts. There are buttons that move, the motor, the blades, and all the electricity and wires going through it. Not only is it moving parts, its purpose is to move something. It causes wind to move in a certain direction and sometimes causing other materials to fly around. I think the most interesting thing is that you can choose how much energy it gives off. It turns potential energy into actual moving energy.

Chapter One- Unit Conversion

Since this chapter deals with unit conversion and we are relating things to the real world, I picked something that I use almost everyday. I chose my tennis racquet because I just had to resting it and there are many unit conversions on it. It converts length, weight, and tension from the standard system to the metric system. This is very useful because tennis players come from all over the world not just the United States. So having the metric system units helps many people when the play tennis. Also in the pros they measure how fast your serve goes in kilometers and then they convert it to miles per hour.

About Me

I entered Kamehameha in the 7th grade as a boarder from Kaua'i. I am currently a junior and live in Lunalilo dorm. I enjoy going to the beach, playing tennis, and cruising with my friends.
    For my freshmen year I had Mr. Hutchison for BSCS and I had Ms. Higa for chemistry last year. I wouldn't consider science as one of my stronger subjects but I do find it pretty interesting. The last few years I have averaged a C for my science grade. The current math class I am in is Algebra 2. 

This picture describes me because this is when I was cruising with my friends after coming back from the beach. It's the two things I like to do and I think I'm a cruise kind of guy most of the time. I also enjoy Kaua'i which is in the background and the outdoors.