Dynamics: Causes That Cause The Movement Of Bodies

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Dynamics: Causes that cause the movement of bodies

The dynamic is the part of the mechanics that study the relationship between the movement and the causes that produce it (the forces), the movement of a body is the result of the interactions with other bodies that are described through forces, it is the part ofThe physics that describes the evolution in the time of a physical system in relation to the causes that cause the changes of physical status and/or state of movement. The objective of the dynamics is to describe the factors capable of producing alterations of a physical system, quantify them and propose equations of movement or evolution equations for said operation system. The dynamic has been the mother science that has given way to traditional mechanics and that allows the construction of a bicycle to modern space trips.

Well, investigating thoroughly and apart from classes, in themselves reliable websites I met more about the dynamics as its origins;One of the first reflections on the causes of movement is due to the Greek philosopher Aristotle;which defined the movement, the dynamic, such as:

"The act of act, of a capacity or possibility of being power, as it is being updated".

Aristotle invests the study of kinematics and dynamics, first studying the causes of the movement and then the movement of the bodies. Galileo’s experiments on uniformly accelerated bodies led Newton to formulate their fundamental laws of the movement, this is how Isaac Newton was the first student to formulate some fundamental laws in this field of study, which, more later, would become a body ofTheories that offer the correct answers for most problems related to moving bodies or those that arise while studying them.

Current scientists consider that the laws made by Newton give the correct answers to most problems related to moving bodies, but there are exceptions. In particular, the equations to describe the movement are not adequate when a body travels at high speeds with respect to the speed of light or when the objects are extremely small size comparable to the sizes.

The dynamics in the field of physics is regulated by Newton’s laws which obeys 3 laws: the first law, indicates that a body will remain at rest or uniform movement except that a force acts on the body;The second law establishes that the variation in the movement of bodies is proportional to the force exerted on it;The third law, expresses that the impulse of a constant force is the product of it by the time that acts and produces an alteration in the amount of movement on the affected body.

The study of dynamics is prominent in mechanical systems (classic, relativistic or quantum), but also in thermodynamics and electrodynamics was initiated by Aristotle around 384 a.C., Since he wondered why the bodies moved, Aristotle developed a theory in an attempt to explain the movements of the bodies. This theory remains valid until the Middle Ages. But Galileo Galilei realized that the own thing is to maintain the uniform rectilinear movement, and then wondered about the causes that change the state of movements of the bodies. This is considered the forces as the cause of variation in the movement of bodies.

Isaac Newton created a coherent theoretical system called Newton’s laws through which it is possible to explain the movement of the bodies that are:

  • Newton’s inertia or first law: describe what happens with the bodies that are in balance.
  • Fundamental principle of the dynamics and second law of Newton: explains what happens when there is no balance
  • Principle of action and reaction or third law of Newton: shows the behavior of the forces, when we have two bodies in interaction.

 

The dynamics in physics:

  • It is a branch of physics that studies movements
  • Study the movement of bodies, origin and their prediction
  • It is based on Newton’s three laws.

The objective of the dynamics is to describe the factors capable of producing alterations of a physical system, quantify them and propose equations of movement or evolution equations for said operation system.

Newton’s second law or also known as the fundamental law of good dynamics This law is what 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.

This second law is responsible for quantifying the concept of force. It tells us that the net force applied to a body is proportional to the acceleration acquired by said body. The proportionality constant is the mass of the body, so that we can express the relationship as follows: f = m a

This law explains what happens if on a body in motion (whose mass does not have to be constant) a net force acts: the force will modify the state of movement, changing the speed in module or direction. Specifically, the changes experienced in the amount of movement of a body are proportional to the motor force and develop in its direction;that is, forces are causes that produce accelerations in the bodies.

This law applies to a large number of physical phenomena, but it is not a fundamental principle such as conservation laws. Applies only if force is an external net force. It does not apply directly in situations where the dough changes, either losing or gaining material or if the object is traveling near the speed of light, in which case the relativistic effects must be included. Nor does it apply on very small scales at the atom level, where quantum mechanics should be used.

According to Newton’s second law, the acceleration of an object is proportional to force F acting on it and inversely proportional to its mass m. Expressing f in Newtons we get to – for any acceleration, not only for free fall – of the following form: A = F/m

In principle express that: "the change of a movement is directly proportional to the driving force printed in it and takes place according to the straight line along which that force is printed". Which means that the acceleration of a moving object responds to the amount of force that is applied to modify its displacement.

The dynamic is present in the daily life of all people, here I will leave some examples of everyday life that are very common:

  1. The fact of kicking a ball. When we kill a ball, we exert strength in a specific direction, which is the direction in which it will travel. In addition, the stronger that ball is kicking, the stronger the strength we put on it and further will go.
  2. Capture the ball with your hand. Professional athletes move their hand back once they take the ball, since it provides the ball more time to lose their speed, and in turn apply less strength on their part.
  3. When we need to push an object or lift a heavy object through a rope. (Move a room from one room from the house to another)
  4. launch an object with the necessary force to get to a place. (Firearms throw bullets kilometers away)
  5. Not to overload a rope with too much weight and that the tension resists. (Safer and efficient elevators)
  6. The necessary force to stop an object that advances or accelerates in one direction. (Catch an object in the air)
  7. When creating structures that are kept in balance. (Prepare more resistant and extravagant buildings)
  8. By manufacturing objects or machines that depend on their speed, strength and resistance. (Engines that take better advantage of fuels)
  9. When designing means of transport that can reach high speeds. (Cars with more aerodynamic models)
  10. When investigating materials that can serve their properties. (Tougher and light materials that can replace metal)
  11. When designing systems that reach high magnitudes without putting people’s integrity at risk. (Trains, airplanes or cars that accelerate safely)
  12. By investigating the different movements of all body types. (Study the movement of planets, stars or other structures)
  13. By looking for more effective ways to do a job that involves forces. (Prepare more efficient machines and tools for jobs such as agriculture)
  14. Design to manufacture that they use the forces better, reducing resources and energy. (Factories with greater production)
  15. Improve resources to obtain resources. (Drilling and oil tubes)
  16. Create products and machines of higher quality and capacity. (Prepare products with more resistant materials)
  17. Pulley systems that work better. (Lift large pesos more easily)
  18. Propose groups of materials that interact better for different jobs. (Materials that disintegrate bone more flexible depending on the need)
  19. When the weight of an object is measured on a scale.
  20. When a crane is used to move a car, an acceleration is added.
  21. At the time of the demolition of a building, an acceleration to the demolition ball is printed.
  22. A snowball that increases its size when rolling downhill, acquires more mass, and takes more acceleration, which is joining the effect of gravity that attracts it to the lowest point.
  23. In the Olympic bullet sport, a force is applied to this dense metal sphere, to make it travel as much distance as possible.
  24. In weightlifting, when the effort is made to carry the weights above the waist, they are applied an instant acceleration.
  25. In a conveyor belt, an acceleration is applied to the displaced product to reach its destination within the production area.
  26. When a beer jar slides on the bar, it is because it has applied a force to make it reach the client.
  27. Load animals are responsible for moving the weight of a cart, giving it an acceleration to get closer to their destination.

In conclusion, the dynamics is the branch of classical mechanics dedicated to the study of the causes that cause the movement of bodies, and the evolution suffered by the state of movement of said body. That is, unlike kinematics, the dynamic if the question of why this body moves? The objective of the dynamics is to describe the factors capable of producing alterations of a physical system, quantifying it and proposing equations of movement or evolution equations for said operation system.

Free Dynamics: Causes That Cause The Movement Of Bodies Essay Sample

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