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Home EDUCATION

How Do I Master Kinematics in Physics for the JEE?

admin by admin
November 5, 2021
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Kinematics is indeed a field of physics which describes the movement of bodies, locations, and groups of objects also known as system bodies, without considering the factors that cause them to shift. Its origins may be traced back to classical physics. Kinematics may be known as “motion geometry” but can also be considered a branch of arithmetic. By explaining the geometry of the system and declaring the initial conditions of any known values of location, speed, and/or velocity of points inside the system, the input variables of any known values of location, speed, and/or velocity of locations inside the system are declared in a kinematics problem. Geometry arguments may then be used to compute the position, speed, and velocity of any undetermined parts of the system. For more details, check analytical dynamics.

In astrophysics, kinematics is used to explain the characteristics of motion of celestial bodies and groups of celestial entities. Kinematics is a word used in robotics, mechanical engineering, and biomechanics to describe the motion of multi-link systems like engines, robotic arms, and human skeletons. By defining the movement of components in a mechanical system, geometric transformations, also known as stiff transformations, are used to simplify the derivation of the equations of motion. They play an important role in dynamic analysis as well. The technique of measuring the kinematic characteristics required to characterise motion is known as kinematic analysis. In engineering, for example, kinematic analysis may be used to determine a mechanism’s range of motion, and kinematic synthesis can be used to build a mechanism with a desired range of motion. In addition, kinematics is the study of a mechanical system’s or mechanism’s mechanical advantage using algebraic geometry.

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In A Non-Rotating Frame of Reference, The Kinematics of a Particle Trajectory

The study of particle kinematics is the study of particle trajectory. A particle’s location is defined as the coordinate vector from the coordinate frame’s origin to the particle. Consider a tower 50 metres south of your house. If the coordinate frame is centred at your house, with east on the x-axis and north on the y-axis, the coordinate vector to the base of the tower is r = (0, 50 metres, 0). If the tower is 50 metres tall and measured along the z-axis, the coordinate vector to the top is r = (0, 50 metres, 50 metres). A three-dimensional coordinate system is used to specify the location of a particle in the most general situation. If the particle must travel on a plane, however, a two-dimensional coordinate system is adequate. Without being characterised in terms of a reference frame, all physics observations are incomplete. A particle’s position vector is a line drawn from the reference frame’s origin to the particle. It represents the point’s distance from the origin as well as its direction away from the origin.

Velocity And Speed

A particle’s velocity is a vector quantity that describes the particle’s magnitude and direction of motion. The velocity of a point is defined as the rate of change of the position vector of a point with respect to time. Consider the ratio obtained by multiplying the difference between two particle locations by the time interval. This ratio is given below, which stands for average velocity over that time interval.

 

 

 

Acceleration

The magnitude and direction of the velocity vector can both vary at the same time. As a result, the acceleration accounts for both the rate of change in the magnitude and the rate of change in the direction of the velocity vector. The same logic that was used to determine velocity for a particle’s location may also be used to define acceleration for a particle’s velocity. The vector formed by the rate of change of the velocity vector is the acceleration of a particle. The ratio is the average acceleration of a particle over a certain time interval.

Point Trajectories in A Plane-Moving Body

By attaching a reference frame to each part and identifying how the different reference frames move relative to each other, the movement of components in a mechanical system may be studied. If the components’ structural stiffness is sufficient, deformation may be ignored, and rigid transformations can be employed to describe relative movement. This simplifies the challenge of describing the motion of numerous pieces of a complex mechanical system to explaining the geometry of each part and its geometric connection with other parts. Geometry is the study of invariants under a collection of transformations. It is the study of characteristics of figures that remain the same as the space is altered in various ways. These transformations can allow the triangle to be displaced in the plane while maintaining the vertex angle and distances between vertices. Kinematics is sometimes referred to as “applied geometry,” in which the movement of a mechanical system is represented using rigorous Euclidean transformations.

Lear how to solve: A man standing on a road has to hold his umbrella at 30^0 with the vertical to keep the rain away. The throws the umbrella and starts running at 10 km/h. He finds that raindrops are hitting his head vertically. Find the speed of raindrops with respect to a. the road, b. the moving man.

 

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