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Kinematics and dynamics is very important concepts in
. Kinematics is the branch of classical mechanics which deals with and describes the motion of objects or group of objects (systems) without considering the causative factors behind the motion where as dynamics is the study of relationship between the motion of objects along with the motion changes and their underlying causes. We at
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The term kinematics has been derived form the Greek word kinetin which means to move. The use of kinematics is decreasing, but it still plays some role in physics. It is also used in the discipline of animal locomotion and biomechanics. The simplest form of application of kinematics is in particle motion which can be transitional or rotational.
The complexity increases in the study of rigid bodies. The rigid bodies are the collection of particles which have invariant distances among themselves. The rigid bodies are able to undergo rotation as well as transition and can also have a combination of these rotations. The system of rigid bodies form a more complicated case, which is linked together by mechanical joints by the use of kinematics, the designing of mechanism can be done which has a desired range of motion. It can also find the possible range of motion which a given mechanism can undertake. Some examples of a simple kinematics are oscillations of a piston in an engine and the movement of a crane
Branches of kinematics
Linear kinematics - Also called transitional kinetics and is the description of the motion of a point in space along line, which is also known as the trajectory or path of the motion. This path can either be curved (curvilinear).or straight (rectilinear).
Particle kinematics-The study of kinematics of a single particle is termed as particle kinematics. The collections of particles, their dynamics are studied by the results obtained.
Rotational kinematics- Is also called angular kinematics and is the description of rotation of an object. For describing the rotation, various methods are used. An example of which is the Euler angle. Attention is given to the simple rotation of the object about an axis of fixed orientation. For convenience, the z axis is chosen. The description of rotation involves angular velocity, angular position as well as angular acceleration.
Dynamics deals with the cause of motion and changes in their motion. Thus dynamics studies why the objects are in motion and the various aspects of forces involved in rotation. It also includes the study of effect of various types of torques in the occurring of motion. The researchers studying dynamics study the developing or altering of a physical system over time while also considering the cause involved for those changes to occur. The physical laws given by Isaac Newton established the various physical laws which govern the dynamics in physics. His system of mechanics makes the study of dynamics easier. Dynamics is also closely related to Newton’s second law of motion. But on a whole, dynamics uses all the three laws of motion. In the discipline of classical electromagnetism, the Maxwell equation describes the dynamics. The dynamics of classical systems involve both electromagnetism and mechanics and are described using Maxwell equations, Newton laws and the Lorentz force.
Concept of force
Force can be defined as an exertion or pressure which causes the movement of an object, as described by Newton. The force describes the influences which cause a free body’s acceleration. It can be created by a push or pull, which changes the direction of an object, which thus has new velocity or can also deform temporarily or permanently. In general terms, by the application of force, an object’s state of motion can be changed.
Newton’s laws and motion of objects
As described by Newton, force is the ability which causes the acceleration of an object.
1. As per Newton’s first law, an object in motion will continue in motion unless an external force is applied. The law also deals with inertia. Inertia is the property of material which helps in resisting acceleration and depends entirely on the mass of the object.
2. As per Newton’s second law, the quantity of force is equal to the product of mass and acceleration.
3. As per Newton’s third law, for every action there is an equal and opposite reaction.
The multibody dynamics is used for modeling the dynamic behavior of interconnected flexible or rigid bodies. Each of these bodies may undergo large rotational as well as transitional displacement. The rigid body dynamics involve the study of motion of rigid bodies which, unlike particles movement in three degrees of freedom, occupy space and also have geometrical properties like moments of inertia and center of mass. The analytical dynamics involves the whole sphere of dynamics studies along with various laws governing them.
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