Study on Newton’s laws, explanation and reflexive opinion
In this unit I first learned, and I remembered again, about Newton’s second law, the objective that is about this unit refers to learning to resolve exercises that have to do with Newton’s second law .This unit deals with the dynamics: it is one of the branches of physics that studies the causes of the movement of bodies. In this unit, we saw on Kepler’s laws and universal gravitation. That also last year was studied.
Newton’s second law, also known as the fundamental law of dynamics, is the one that determines a proportional relationship between force and variation of the amount of movement or linear momentum of a body. In other words, the force is directly proportional to the mass and the acceleration of a body.
Newton’s second law is responsible for quantifying the concept of force. It tells us that the net force applied to a body is directly proportional to the acceleration that this body is acquired. The proportionality constant: is the mass of the body, so that we can express the relationship as follows: F = m.a
To be more rigorous, Newton’s second law must be expressed as the derivative of the linear moment .The second law turns out to be more complex to use when applied by body whose mass does not remain constant while moving as it happens in rockets and airplanes The fuel is eliminated when its combustion occurs in such a case the derivative The linear momentso that one of them appears the temporary variation of the dough.
This law describes what happens to a body when it acts on it a net force to understand it we must introduce a new physical magnitude that is the linear momentTherefore it represents a measure of the difficulty that would be to stop it, it is called a linear momentum, amount of movement or impetus.
This is a vector magnitude that is directly proportional to its mass and speed, according to this definition the linear moment of a body of mass m that moves at a speed, the linear momentTo the trajectory.
The second law states and establishes that the action of a net force on a body of mass m from the place to a variation in the time of its linear momentlinear, where we have considered that the mass of the body remains constant.
Newton is defined as the force exerted on a 1 kg body causes it to move with an acceleration of 1 m . S-2, if the body starts from rest, it will move with uniformly accelerated rectilinear movement in the direction and sense of the resulting force on it.
This principle has great applicability in many areas of physics, for example, it is used in large particle accelerators when studyExample is also observed in clashes between billiard balls, in this case the relationship between distance and time is to say the speed of the ball can be expressed as follows, p = m.v
Suppose to make the easiest case, a system formed by two mass particles each constant m1 and m2 that moves at a speed V1 and V2 .The force that each particle exerts on the other implies that the second exerts on the first one a force of equal module, direction and opposite direction therefore both forces are annulled, if no exterior force does not act on the system the total linear moment of the system will remainconstant.
The second law creates movement, an example is: movement by pushing a man a truck this body moves but why does this happen? ,What happens is that due to the amount of mass that this body has since by constant force it will be directly proportional to the mass.
Kepler’s laws establish the planet’s stations, this explains why it is hot or cold on earth, this occurs because the sun moves away from the planet will then be cold, thanks to this law it was shown that Jesus was not born in December because inthat time towards too cold. Kepler’s laws explain how the movement of the planets around the sun is and are the result of thorough observations made for many years for this reason we say that they are empirical laws.
In a Ferrari race the mobile reaches the highest possible speed but it will never be in a straight line but in curve that linear acceleration will become centripetal acceleration.
In order for a person to make a curve movement had to make some variations of the force, I learned that a loop is where several turns are made.
The teacher explained about the laboratory practice that we are going to do in this quimestre and its materials.
During the takeoff of a space ferry, Newton’s three laws act, so that these laws must be analyzed by scientists because a minimal failure can cause a terrible catastrophe. A clear exception is the rockets in which the fuel is very needed to be able to send them to the outer space is consumed and whose mass with respect to the mass of the rocket itself is very large, a car that circulates on the road also consumes fuel but itsmass regarding that of the car without fuel is very small with what the inertia of the car without fuel or with it barely changes.
The units that make up the Newton are kilograms meters / second squared kg = m / s2, presents magnitude as the mass length and acceleration of gravity this causes objects to fall with a force depending on the amount of mass, we start from theFirst law an external force that changes the rest in motion of a body, whether it increases or decreases its speed.
In an experiment with the linear air track it is used to completely cancel the friction between the surface of two objects, here the dough moves with an acceleration when the mass is constant means that to greater force greater acceleration and to lower force minor acceleration inFew words the mass is directly proportional to the acceleration for a mass when the force increases the acceleration and vice versa.
When applying a constant force of 12 N in chain to masses of 1, 2 and 3 kg, accelerations of 12 m /s2, 6 m /s2 and 4 m /s2 will be produced respectively.
From the previous observations, it is possible to state Newton’s second law on the movement.
An air track is absolutely everything that is needed to configure a frictionless environment. The system will cover all the foundations of Newton’s dynamics and laws.
We saw on the explanation of the air track experiment, the force is constant if we apply the same force to the same mass then its acceleration will change, if we have double mass its acceleration will be half, if we have triple mass itsacceleration will be the third part the more its acceleration will decrease.
Since this relationship depends on the definition of a new unit, we can replace only congruent units with such definition. For example, if the dough is given in kilograms (kg), the force unit must be in Newtons (N) and the acceleration unit must be in meters per second to the square (m/s*).
Force (n) = mass (kg) x acceleration (m/s*)
In the Sueu a new unit of mass is defined from the chosen units of Libra (IB) for strength, and feet per second to the square (ft/s*) for acceleration.
To calculate problems with elevator, the formula that is:
mg-t = ma
If the force does not change, by increasing the mass there will be a proportional decrease in acceleration. When there is the same force to lower mass acceleration, it means that they are inversely proportional in Newton’s second law. The sum of all forces will be equal to the mass by acceleration.
Now I am going to write an exercise that the teacher explained in clas. Exercise is as follows: a resulting force of 29 Newtons acts on a mass of 7.5 kg in direction This is the resulting acceleration?
The first thing we have to do here is to look for its equation that is the equal force to mass by acceleration f = m.a.
Now we have to clear this equation because the exercise asks us to find acceleration so we clear the acceleration what will be equal to the divided force for the mass, once we have already clear this equation the following is to put its results that would be acceleration equal to 29 n / for7.5 kg, 1 we eliminate kilograms and kilograms and we have as a result 3.87 m/s2.
Another example: What resulting force will give a sled that weighs 24 kg an acceleration of 5 m/s2? What we have to do first is to look for the equation that is weighed equal to severity.kg divided for 9.8 meters per second squared, we eliminate meters per second squared and meters per second squared and this is a mass of 2.44 kg now that we have the mass we must find its strength and now we have the Equation forces equal to mass by acceleration we replace all the data and we would result in 12.24 n.
Another example is: an experiment aboard a space ferry, an astronaut observes that a force resulting from only 12n will teach a steel box an acceleration of 4 m/s2 What is the mass of the box?
Its solution is the following we look for the equation that is force equal to mass by acceleration this equation we must clear it and it would remain as a divided force for acceleration we replace the examples in the equation and we will have mass equal to 12 Newtons / for 4 m / s2, this results in 3 kg and this is its solution.
My experience in this unit was that I understood the exercises although there are sometimes in which I do not understand them and I have to be watching videos, but in this unit it became very easy since they are themes that I have seen last year, although I stillIt makes it difficult for me, what is the equation that I must choose to be able to perform an exercise since if I have not understood this I cannot perform an exercise with its well done procedure. I care to understand everything that the physics exercises carry out, since in the University Physics is one of the subjects that are most in college and I will apply all my knowledge in each exercise that I solve.
And to carry out this personal criterion I had to investigate some sources on the Internet, books and the slides that were of great help and in the sources I consult obtained very important information that I did not know it.
Those issues were what I understood in Unit 4 helped me greatly to perform my tasks and better clarify my doubts that existed when doing some activity.
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