Energy!

Energy is all about your statement, if you are able to get your statement right then its smooth sailing from there. Now in my example the statement is PEe=KE because the initial energy= the final energy and PEe is the initial and KE is the final. In my example a kid wants to shoot his arrow faster to be able to beat his component but to do so he has to fix his bow by changing the spring constant. OBSERVE!....

Now Let us Reflect on Some Spinny Things, and Some Gravitational Things...

Uniform Circular Motion...
In this unit we learned a great deal about uniform circular motion. Objects in UCM have a constant speed but they do not have a constant velocity. They do not have a constant velocity because the object is not changing magnitude though it is changing direction, making the velocity not be constant. Also we learned that if the uniform circular motion breaks, then the object will go in the direction of the tangental line of the circle at that exact point. If an object in UCM changes direction then the object is accelerating in which the acceleration is always pointed towards the center of the circle. The centripetal force can be caused by many different variable such as tension, normal, or any other force, so you would just have to equal Fc to which ever force causes it.

Universal Gravitation...
Now for some Gravitational de Universal! Newton found that the corfe that causes objects to fall to the earth exists between all other bodies. He discovered that the gravitational force varies inversely with the square of the distance between the centers of the two masses. The Law of Universal Gravitation says that, " Every object in the universe attracts every object in the universe with a force that varies directly with the product of their masses and inversely with the square of the distance between the centers of the two masses." This force is G=6.67X10^-11 which can be used for any planet no matter where it is.

This was a really challenging unit. The circular motion was not that difficult or hard to learn, but the main problem was the Universal Gravitation. I was able to set up the equations but the main problem was that you had to solve it mostly on the calculator. I was able to use my problem solving skills to just over use the parenthesies, and then once I fixed that I started getting the right answers without having to redo the calculations 10 times!

Lets BUST THIS!...With a MANCOASTER!

Prediction:
If an object always moves in the direction of the net force exerted on it and we push Ryan on his man-coaster then the man-coaster will slow down, and therefore, moves in the negative direction even though it was pushed in the positive direction.

Myth #1: An object always moves in the direction of the net force exerted on it.
This myth is stating that any object will go in the direction the the net force is applied, but it is obvious to see that this can be disproven.

ΣFx=-Ff    ΣFy= Fn-Fg

Looking at this free body diagram of the awesome man coaster you can see that the ΣFx = -Ff but acording to the myth he shouldn't be going in a positive direction, which he is. This is disproven since Ryan and the MANCOASTER are going in a positive direction yet their net force is negative.

Myth #2:  An object always changes its motion if there is a force exerted on it by other objects.

This myth is stating that any force exerted on an object will change its direction, but this is obviously a false statement.

ΣFx=Fax-Ff      ΣFy=Fn-Fay-Fg
Here is an FBD of when the highlighter makes an impact on the bowling ball, the bowling ball obviously didnt't move at all when the highlighter made an impact instead it just rolled on like nothing happend.

Now we can CONCLUDE:

The myths we busted were busted without specialized tools to see movements or other observations that the naked eye can not see. But due to the fact that the ball did not change directions and that the MANCOASTER stopped, we can safely conclude that the myths are BUSTED. People believe these myths because without testing them they sound like they are true but once they are tested people can see that they aren't. Mostly people believe the myths because they don't really want to think it through or if they do it sounds good in their head but once they see it its stated otherwise.



Those 3 Laws...

1.Newton's First Law:
Newton's first law states that, "An object at rest tends to stay at rest and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalance force." This means that any object that is moving in at a constant speed will keep moving at that rate unless an unbalanced force comes into the equation, meaning it exits the state of equilibriam. What has seemed to be a problem for me when I try to work a problem on Newton's First Law is when the object rests or is moving on an incline plane. I find it difficult though with my problem solving skills I am able to find the normal force, which always seems to be a problem for me to find. My strengths in the First Law Problems are the ones with the tension ropes that have specific angles.

2. Newton's Second Law:

Newton's Second Law states that, "For a particular force, the acceleration of an object is proportional to the net force and inversely proportional to the mass of the object. The direction of the force is the same as that of the acceleration." Now this law is confusing for most people because unlike the First Law you have to make ΣF=ma instead of 0. With this law we did problems concerning apparent weight, pulley systems and friction. With the apparent weight it would show that the weight of something is different depending on the direction its going like if a man is in an elevator thats going up he would weigh more. In the pulley systems we would measure the mass and/or tension of the items and the rope. Last we studied friction problems with the mu and the force of friction. So the second law deals with the forces that are unbalanced, that aren't in equilibriam. What I have found difficult with this law is finding the acceleration. I am so used to just using algebra and finding the acceleration through the original equation but I end up getting the wrong answer 50% of the time. I used my problem solving skills to fix my problem by using the equation a=ΣF/m and then I end up with the correct answer. The Second Law is most likely the most confusing of Newton's Laws of Motion.

3. Newton's Third Law: Newton's Third Law states, "When one object exerts a force on another object, the second object excerts on the first an equal force in opposite direction." What this means is whenever something excerts a force on something else that force that was acted upon excerts a force that is equal to the original just in an opposite direction. For example, if a man pushes a bar verticly upward then the bar pushes the man verticly downward. My problem solving skills helped me by understanding the opposites of each of the different forces. Newton's Third Law is based upon the concept of action-reaction.

A Reflection of Vectors and Projectile Motion's Past

     In this unit I learned about vectors and prjectile motion. This is what I learned about projectile motion. While studying projectile motion I learned that there are always two components you have to consider, the horizontal (x) and vertical (y). While the vertical component changes velocity, the horizontal does not because the horizontal component does not have the variable of gravity while the vertical does. The factors of this lesson that I thought were confusing and that I could not understand were the formulas for the projectile motion at an angle problems. My problem-solving skills helped me in this lesson because most of the time I can find the other formulas based off of one of the formulas. I can make plently of connections to this unit. When I hunt of course my bullet is not going to just go straight forever because I have learned that there is a vertical component to the shot. Also when I throw the Shot Put I can now, roughly, grasp an idea of where it will land if I estimate my angle and velocity. I also learned a great deal about vectors. With vectors I learned how to plot them correctly on a graph by showing the length as the magnitude and the direction of the line the direction of the vector. What I found difficult about vectors is how to know when to subtract 180 or add 180 and etc. Wtih my problem solving skills I have been succesful in finding out how to use the -180 and +180 by using trial and error, but thats only when I have the answer. In my life there are vectors when I run because I can calculate the velocity which is a vector. I learned much in this unit of physics about projectile motion and vectors.

WARNING: Gravity Hurts

     Mrs. Gende had us create a Tagxedo about Kinematics, as you can see mine below. Mrs. Gende also had us create a comic using pixton about a concept of Kinematics, I chose gravity. My comic explains acceleration due to gravity. Gravity is a term used for the downward acceleration when something is falling, and also the upward acceleration when something is thrown up. In my comic I present an example of downward acceleration due to gravity. In it the object ( in this case a person,) has a downward acceleration of 9.8 m/s². When the person is thrown upward he maintains his acceleration of -9.8 m/s² which causes his speed to gradually decrease, except in this case because of Mrs. Gende's super kick. Gravity is explained in a very understandable way in my comic.

Success in Physics

Physics is not an easy subject, but with my strategies that I will use in and out of the classroom, I shall not fail. I usualy don't write down my assignments in my agenda and then I usualy forget them and don't do them. In physics though it is going to be different. I am going to write down the assignment every day and be sure to get them done. Also I am going to make it a major point to bring all of the neccisary materials to class. Next I am going to pay attention in class and just because Mrs. Gende has already given all the notes to everyone doesn't mean that we don't have to take notes, so I will still be taking notes in class as an addition to her notes. I am not going to sit back in my seat and just watch the clock go by but instead I am going to pay attention to all presentations and take notes but most of all be engaged with the lectures. When I read something that has to do with physics I am not just going to let it float away from my mind, but instead take notes and if it is something on the internet I will save it. Next I am going to check the website regularly so that if Mrs. Gende (The most awesome teacher ever!) changes something that I will be aware of it. Another thing is that i will keep up with my assignments since that is one of my major weaknesses. If I end up being absent from class I will go into see Mrs. Gende because from previous experiences I haven't gone in, and when you don't what the teacher is talking about you know that there is something wrong. Another thing is that I am going to make sure that I understand the material because if you do not understand something and you never ask then when Mrs. Gende goes onto another subject that subject could be totaly about the one you did not understand, and that's when the trouble starts. Since physics basicly has it's own language be sure to not do a problem that you dont understand a word or a symbol because your interpretation could be, and most likly, totaly wrong. Next you are going to have to use the Four Step Plan on every problem to be succesful.
1. Write down what you have to solve, check your units, and make a sketch if you need to.
2. Write down the equation and solve it with the methods and don't use trial and error.
3. Substitute the values into the equations.
4. Check your answers and WRITE DOWN THE UNITS!
Next make sure to not make your calculator made because in this class it is your best friend in the whole world. Also remember to label your graph on the axis and give it a title. Make sure to stay organized in physics because it is realy easy to get off track. Make sure that when your in class your able to answer any questions thrown at you. Always try to be as self sufficent as possible but don't be arrogant and not seek help. Last communication is key to surviving the hardships of being a physics student.