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!....
Tuesday, January 25, 2011
Sunday, January 16, 2011
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!
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!
Thursday, January 6, 2011
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.
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.
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