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# Rigid Bodies and Application to Snooker - Assignment Example

Summary
The study of rigid body dynamics allows us to understand the main principles and laws of mechanics on practice as it provides visual examples on the base of natural observations. Rigid body dynamics principles and laws allow us to simply a number of real life physical problems, which deal with motion of bodies and successfully solve them…

## Extract of sample"Rigid Bodies and Application to Snooker"

Download file to see previous pages In this project I made a study of main laws and principles of rigid body dynamics from the practical and theoretical point of view: as solutions to theoretical and practical exercises are provided. It required review and deeper study of vector analysis and analytical geometry.
Rigid body in mechanics is a system of material points, which doesn't change in time. So it's an idealized system for which the distance between its particles remains constant in time under any motion. Phenomenological mechanics considers rigid body to be a solid matter, in which particles are subjected to internal forces in the form of normal and tangent tensions. Such tensions are caused by external deformations. In case they're re no deformations, there are no tensions inside rigid body. In many cases deformations are so small that can be neglected. So such model is an idealized rigid body, which is not able to deform and even though internal tensions can take place because of external forces.
Rigid body is a mechanical system with six degrees of freedom. In order to define the position of a rigid body it's enough to know the position of at least 3 points: A, B, C, which do not belong to one line. In order to prove that rigid body is described by six degrees of freedom we have to take point D. ...
(XA-XB)^2+(YA-YB)^2+(ZA-ZB)^2=AB^2=const
(XC-XB)^2+(YC-YB)^2+(ZC-ZB)^2=CB^2=const
(XA-XC)^2+(YA-YC)^2+(ZA-ZC)^2=AC^2=const

Because the lengths of sides of triangle ABC remain the same. So only six coordinates are left independent - rigid body has 6 degrees of freedom.
If the body has fixed points the number of freedoms degrees reduces. If rigid body is fixed in one point - it has 3 degrees of freedom, if rigid body can only rotate around one axis is has one degree of freedom, if a body can slide across axis it has two degrees of freedom.

In order to understand how x(t) and R(t) change over time we should remind the following formulas:

Resultant is v= V+ [w, R] (using vector properties).

Kinetic energy of a rigid body is total kinetic energy of rotation plus total kinetic energy of motion:
T=.5 mv^2 + 0.5Iw^2

Where I is moment of inertia of a rigid body (mass analogue for rotational motion)
Moment of inertia is defined as I=miRi^2. Moment of inertia is additive so moment of inertia of a rigid body is formed from the sum of inertia moments of its parts. Any body, independently from rotational motion or rest has definite moment of inertia. Mass distribution in the limits of a body can be characterized by density: p=m/V
So moment of inertia can be expressed as I=piRi^2Vi, if density is constant: I=pRi^2Vi
In limit it can be expressed in the following integral:
I=R^2dm=pR^2dV

The inertia tensor is a set of nine values (which can be written in the form of 3X3 matrix), which shows the dependence of shape and distribution of mass in the rigid body caused by its rotational motion. It's often explained as a scaling factor between angular momentum and angular velocity.1 Inertia tensor matrix has the following structure and its components are calculated ...Download file to see next pagesRead More
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