This document discusses analyzing the motion of particle systems using Newton's laws of motion. It begins by defining a particle and describing the position, velocity, and acceleration vectors of a particle. It then discusses how to use Newton's laws to calculate the forces needed to cause a particle to move in a particular way and how to derive equations of motion for particle systems. Examples are provided on simple harmonic motion and calculating the forces required to tip over a bicycle. The document concludes by outlining the general procedure for deriving and solving equations of motion for systems of particles.
Learn Online Courses of Subject Engineering Mechanics of First Year Engineering. Clear the Concepts of Engineering Mechanics Through Video Lectures and PDF Notes. Visit us: https://ekeeda.com/streamdetails/subject/Engineering-Mechanics
Learn Online Courses of Subject Engineering Mechanics of First Year Engineering. Clear the Concepts of Engineering Mechanics Through Video Lectures and PDF Notes. Visit us: https://ekeeda.com/streamdetails/subject/Engineering-Mechanics
Introduction to statics and its Applications in Real Life
countents
Introduction to statics
Force and Equilibrium
Structural Analysis
Friction
Centroid
Moments of Inertia
The basis for kinetics is Newton's second law, which states that when an unbalanced force acts on a particle, the particle will accelerate in the direction of the force with a magnitude that is proportional to the force.
Fundamentasl of Physics "CENTER OF MASS AND LINEAR MOMENTUM"Muhammad Faizan Musa
9-1 CENTER OF MASS
fter reading this module, you should be able to . . .
9.01 Given the positions of several particles along an axis or
a plane, determine the location of their center of mass.
9.02 Locate the center of mass of an extended, symmetric
object by using the symmetry.
9.03 For a two-dimensional or three-dimensional extended object with a uniform distribution of mass, determine the center
of mass by (a) mentally dividing the object into simple geometric figures, each of which can be replaced by a particle at its
center and (b) finding the center of mass of those particles.
9-2 NEWTON’S SECOND LAW FOR A SYSTEM OF PARTICLES
After reading this module, you should be able to . . .
9.04 Apply Newton’s second law to a system of particles by relating the net force (of the forces acting on the particles) to
the acceleration of the system’s center of mass.
9.05 Apply the constant-acceleration equations to the motion
of the individual particles in a system and to the motion of
the system’s center of mass.
9.06 Given the mass and velocity of the particles in a system,
calculate the velocity of the system’s center of mass.
9.07 Given the mass and acceleration of the particles in a
system, calculate the acceleration of the system’s center
of mass.
9.08 Given the position of a system’s center of mass as a function of time, determine the velocity of the center of mass.
9.09 Given the velocity of a system’s center of mass as a
function of time, determine the acceleration of the center
of mass.
9.10 Calculate the change in the velocity of a com by integrating the com’s acceleration function with respect to time.
9.11 Calculate a com’s displacement by integrating the
com’s velocity function with respect to time.
9.12 When the particles in a two-particle system move without the system’s commoving, relate the displacements of
the particles and the velocities of the particles,
Ekeeda Provides Online Civil Engineering Degree Subjects Courses, Video Lectures for All Engineering Universities. Video Tutorials Covers Subjects of Mechanical Engineering Degree. Visit us: https://ekeeda.com/
Learn Online Courses of Subject Engineering Mechanics of First Year Engineering. Clear the Concepts of Engineering Mechanics Through Video Lectures and PDF Notes. Visit us: https://ekeeda.com/streamdetails/subject/Engineering-Mechanics
Introduction to statics and its Applications in Real Life
countents
Introduction to statics
Force and Equilibrium
Structural Analysis
Friction
Centroid
Moments of Inertia
The basis for kinetics is Newton's second law, which states that when an unbalanced force acts on a particle, the particle will accelerate in the direction of the force with a magnitude that is proportional to the force.
Fundamentasl of Physics "CENTER OF MASS AND LINEAR MOMENTUM"Muhammad Faizan Musa
9-1 CENTER OF MASS
fter reading this module, you should be able to . . .
9.01 Given the positions of several particles along an axis or
a plane, determine the location of their center of mass.
9.02 Locate the center of mass of an extended, symmetric
object by using the symmetry.
9.03 For a two-dimensional or three-dimensional extended object with a uniform distribution of mass, determine the center
of mass by (a) mentally dividing the object into simple geometric figures, each of which can be replaced by a particle at its
center and (b) finding the center of mass of those particles.
9-2 NEWTON’S SECOND LAW FOR A SYSTEM OF PARTICLES
After reading this module, you should be able to . . .
9.04 Apply Newton’s second law to a system of particles by relating the net force (of the forces acting on the particles) to
the acceleration of the system’s center of mass.
9.05 Apply the constant-acceleration equations to the motion
of the individual particles in a system and to the motion of
the system’s center of mass.
9.06 Given the mass and velocity of the particles in a system,
calculate the velocity of the system’s center of mass.
9.07 Given the mass and acceleration of the particles in a
system, calculate the acceleration of the system’s center
of mass.
9.08 Given the position of a system’s center of mass as a function of time, determine the velocity of the center of mass.
9.09 Given the velocity of a system’s center of mass as a
function of time, determine the acceleration of the center
of mass.
9.10 Calculate the change in the velocity of a com by integrating the com’s acceleration function with respect to time.
9.11 Calculate a com’s displacement by integrating the
com’s velocity function with respect to time.
9.12 When the particles in a two-particle system move without the system’s commoving, relate the displacements of
the particles and the velocities of the particles,
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Learn Online Courses of Subject Engineering Mechanics of First Year Engineering. Clear the Concepts of Engineering Mechanics Through Video Lectures and PDF Notes. Visit us: https://ekeeda.com/streamdetails/subject/Engineering-Mechanics
Rotational dynamics as per class 12 Maharashtra State Board syllabusRutticka Kedare
This ppt is as per class 12 Maharashtra State Board's new syllabus w.e.f. 2020. Images are taken from Google public sources and Maharashtra state board textbook of physics. Gif(videos) from Giphy.com. Only intention behind uploading these ppts is to help state board's class 12 students understand physics concepts.
5-1 NEWTON’S FIRST AND SECOND LAWS
After reading this module, you should be able to . . .
5.01 Identify that a force is a vector quantity and thus has
both magnitude and direction and also components.
5.02 Given two or more forces acting on the same particle,
add the forces as vectors to get the net force.
5.03 Identify Newton’s first and second laws of motion.
5.04 Identify inertial reference frames.
5.05 Sketch a free-body diagram for an object, showing the
object as a particle and drawing the forces acting on it as
vectors with their tails anchored on the particle.
5.06 Apply the relationship (Newton’s second law) between
the net force on an object, the mass of the object, and the
acceleration produced by the net force.
5.07 Identify that only external forces on an object can cause
the object to accelerate.
5-2 SOME PARTICULAR FORCES
After reading this module, you should be able to . . .
5.08 Determine the magnitude and direction of the gravitational force acting on a body with a given mass, at a location
with a given free-fall acceleration.
5.09 Identify that the weight of a body is the magnitude of the
net force required to prevent the body from falling freely, as
measured from the reference frame of the ground.
5.10 Identify that a scale gives an object’s weight when the
measurement is done in an inertial frame but not in an accelerating frame, where it gives an apparent weight.
5.11 Determine the magnitude and direction of the normal
force on an object when the object is pressed or pulled
onto a surface.
5.12 Identify that the force parallel to the surface is a frictional
the force that appears when the object slides or attempts to
slide along the surface.
5.13 Identify that a tension force is said to pull at both ends of
a cord (or a cord-like object) when the cord is taut. etc...
Introduction to Classical Mechanics:
UNIT-I : Elementary survey of Classical Mechanics: Newtonian mechanics for single particle and system of particles, Types of the forces and the single particle system examples, Limitation of Newton’s program, conservation laws viz Linear momentum, Angular Momentum & Total Energy, work-energy theorem; open systems (with variable mass). Principle of Virtual work, D’Alembert’s principle’ applications.
UNIT-II : Constraints; Definition, Types, cause & effects, Need, Justification for realizing constraints on the system
LECTURE 1 PHY5521 Classical Mechanics Honour to Masters LevelDavidTinarwo1
Classical mechanics, a well-organized introductory lecture. This is easy to follow, and a must-go-through lecture. UNIT-I : Elementary survey of Classical Mechanics: Newtonian mechanics for single particle and system of particles, Types of the forces and the single particle system examples, Limitation of Newton’s program, conservation laws viz Linear momentum, Angular Momentum & Total Energy, work-energy theorem; open systems (with variable mass). Principle of Virtual work, D’Alembert’s principle’ applications.
UNIT-II : Constraints; Definition, Types, cause & effects, Need, Justification for realizing constraints on the system, Difficulties introduced by imposing constraints on the system, Examples of constraints, Introduction of generalized coordinates justification. Lagrange’s equations; Linear generalized potentials, Generalized coordinates and momenta & energy; Gauge function for Lagrangian and its gauge invariance, Applications to constrained systems and generalized forces.
Theory of Vibrations: Introduction to the theory of vibrations in multi-degree-of-freedom systems, Normal modes and modal analysis, Nonlinear oscillations and chaos theory.
Canonical Transformations: Properties and classification of canonical transformations, Action-angle variables and their applications in integrable systems, Canonical perturbation theory and perturbation methods.
Poisson's and Lagrange's Brackets: Definitions and properties of Poisson's brackets, Relationship between Poisson's brackets and Hamilton's equations, Lagrange's brackets and their applications in dynamics. UNIT-III : Cyclic coordinates, Integrals of the motion, Concepts of symmetry, homogeneity and isotropy, Invariance under Galilean transformations Hamilton’s equation of motion: Legendre’s dual transformation, Principle of least action; derivation of equations of motion; variation and end points; Hamilton’s principle and characteristic functions; Hamilton-Jacobi equation.
UNIT-IV : Central force fields: Definition and properties, Two-body central force problem, gravitational and electrostatic potentials in central force fields, closure and stability of circular orbits; general analysis of orbits; Kepler’s laws and equation, Classification of orbits, orbital dynamics and celestial mechanics, differential equation of orbit, Virial Theorem.
UNIT-V : Canonical transformation; generating functions; Properties; group property; examples; infinitesimal generators; Poisson bracket; Poisson theorems; angular momentum PBs; Transition from discrete to continuous system, small oscillations (longitudinal oscillations in elastic rod); normal modes and coordinates.
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Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
2. INTRODUCTION
1.The concept of a particle
2. Position/velocity/acceleration relations for a particle
3. Newton’s laws of motion for a particle
4. How to use Newton’s laws to calculate the forces needed to make a particle move
in in a particular way
5. How to use Newton’s laws to derive `equations of motion’ for a system of particles
3. Definition of a particle:-
A `Particle’ is a point mass at some position in space. It can move about,
but has no characteristic orientation or rotational inertia. It is
characterized by its mass.
• Example:
A molecular dynamic simulation, where you wish to calculate the motion
of individual atoms in a material. Most of the mass of an atom is usually
concentrated in a very small region (the nucleus) in comparison to inter-
atomic spacing. It has negligible rotational inertia.This approach is also
sometimes used to model entire molecules, but rotational inertia can be
important in this case.
4. Position vector of a particle:-
• In most of the problems we solve in this course, we will specify the
position of a particle using the Cartesian components of its position
vector with respect to a convenient origin.This means
1.We choose three, mutually perpendicular, fixed directions in space.
The three directions are described by unit vectors {i, j,k}
2.We choose a convenient point to use as origin.
3.The position vector (relative to the origin) is then specified by
the three distances (x,y,z) shown in the figure.
r = x(t)i+ y(t)j+ z(t)k
5. Velocity vector:-
By definition, the velocity is the derivative of the position vector
with respect to time By definition, the velocity is the derivative of
the position vector.
Velocity is a vector, and can therefore be expressed in terms of its
Cartesian components.
6. You can visualize a velocity vector as follows
1.The direction of the vector is parallel to the direction of motion
2. The magnitude is the speed of the particle, i.e,
When both position and velocity vectors are expressed in terms Cartesian components, it is simple
to calculate the velocity from the position vector.
This is really three equations – one for each velocity component, i.e.
7. ACCELERATION VECTOR:
The acceleration is the derivative of the velocity vector with respect to time; or,
equivalently, the second derivative of the position vector with respect to time.
The acceleration is a vector, with Cartesian representation.
Acceleration has magnitude and direction.
8. The relations between Cartesian components of position, velocity and acceleration are
Example using position-velocity-acceleration relations:
EXAMPLE :-Simple Harmonic Motion: The vibration of a very simple spring-mass
system is an example of simple harmonic motion.
In simple harmonic motion (i) the particle moves along a straight line; and
(ii) the position, velocity and acceleration are all trigonometric functions of time.
The vibration of a very simple spring mass system is an example of simple harmonic motion.
9. Harmonic vibrations are also often characterized by the frequency of vibration:
1).The frequency in cycles per second (or Hertz) is related to the period by
2).The angular frequency is related to the period by
The velocity and acceleration are also harmonic, and have the same period and frequency as
the displacement.
10. Polar coordinates for particles moving in a plane
When solving problems involving central forces (forces that attract particles towards a fixed
point) it is often convenient to describe motion using polar coordinates.
Polar coordinates are related to x,y coordinates through
Suppose that the position of a particle is specified by its ‘polar coordinates’ relative to a fixed
origin, as shown in the figure. Let e be a unit vector pointing in the radial direction, and let ‘e’ be
a unit vector pointing in the tangential direction, i.e
The velocity and acceleration of the particle can then be
expressed as
11. Motion and types of motion
what is motion?
An object is said to be in motion if it changes its position with respect
to its surroundings in given time.
Motion is always observed and measured with a point of referance.
All living things show motion where as non-living things show motion only
when some force is acting on it.
23. The Newtonian Inertial Frame:
An inertial frame of reference, in classical physics, is a frame of reference in which
bodies, whose net force acting upon them is zero, are not accelerated, that is they are at rest
or they move at a constant velocity in a straight line.
Frames of reference in which Newton's laws of motion are observed are called Inertial
Frames.
24. Calculating forces required to cause prescribed motion of a
particle :-
We use the following general procedure to solve problems
(1) Decide how to idealize the system
(2) Draw a free body diagram showing the forces acting on each particle
(3) Consider the kinematics of the problem.
(4)Write down F=ma for each particle.
(5) Solve the resulting equations for any unknown components of force or acceler
ation -ation
25. Example : Bicycle Safety. If a bike rider brakes too hard on the
front wheel, his or her bike will tip over In this example we
investigate the conditions that will lead the bike to capsize, and
identify design variables that can influence these conditions.
If the bike tips over, the rear wheel leaves the ground. If this happens,
the reaction force acting on the wheel must be zero.
so we can detect the point where the bike is just on the verge of
tipping over by calculating the reaction forces, and finding
the conditions where the reaction force on the rear wheel is zero.
1. Idealization:
a.We will idealize the rider as a particle
(apologies to bike racers – but that’s how
we think of you…).The particle is located
at the center of mass of the rider.The
figure shows the most important design
parameters- these are the height of the
26. rider’s COM, the wheelbase L and the distance of the COM from the rear wheel.
b.We assume that the bike is a massless frame.The wheels are also assumed to have no mass.
This means that the forces acting on the wheels must satisfy F =0 and M =0 and can be
Analyzed using methods of statics. If you’ve forgotten how to think about statics of wheels,
you should re-read the notes on this topic – in particular, make sure you understand the nature
of the forces acting on a freely rotating wheel (Section 2.4.6 of the reference notes).
c.We assume that the rider brakes so hard that the front wheel is prevented from rotating. It
must therefore skid over the ground. Friction will resist this sliding.We denote the friction
coefficient at the contact point B by µ.
d.The rear wheel is assumed to rotate freely.
e.We neglect air resistance.
2. FBD.The figure shows a free body diagram for the rider and for the bike together. Note that
a.A normal and tangential force acts at the contact point on the front wheel (in general, both
normal and tangential forces always act at contact points, unless the contact
happens to be frictionless). Because the contact is slipping it is essential to draw the
friction force in the correct direction – the force must resist the motion of the bike;
b. Only a normal force acts at the contact point on the rear wheel because it is freely
rotating, and behaves like a 2-force member
27. 3. KinematicsThe bike is moving in the i direction.As a vector, its acceleration is therefore a i = a ,
where a is unknown.
4. EOM: Because this problem includes a massless frame, we must use two equations of motion
( F= ma ). It is essential to take moments about the particle (i.e. the rider’s COM). gives
F=ma gives –Ti +(N +N –w)j=mai
It’s very simple to do the moment calculation by hand, but for those of you who find such
calculations unbearable here’s a Mupad script to do it.The script simply writes out the position
vectors of points A and B relative to the center of mass as 3D vectors, writes down the reactions at A
and B as 3D vectors, and calculates the resultant moment (we don’t bother including the weight,
because it acts at the origin and so exerts zero moment)
28. Example:
Let us consider a `tablecloth trick’ in which a tablecloth is whipped out from underneath a fully
set table
In this problem we shall estimate the critical acceleration that must be imposed on the
tablecloth to pull it from underneath the objects placed upon it.
We wish to determine conditions for the tablecloth to slip out from under the glass. We can do
this by calculating the reaction forces acting between the glass and the tablecloth.
29. 1.Idealization:
We will assume that the glass behaves like a particle.
2.FBD:-
The forces include (i) the weight; and (ii) the normal and tangential components of
reaction at the contact between the tablecloth and the glass.
3.Kinematics :
We are assuming that the glass has the same acceleration as the tablecloth.
The table cloth is moving in the i direction, and has magnitude a.The acceleration vector is
therefore a = ai.
30. 4.EOM:-
Newton’s laws of motion yield
5.Solution:-
The i and j components of the vector equation must each be satisfied,
so that
Finally, we must use the friction law to decide whether or not the tablecloth will slip from under the
glass. For no slip, the friction force must satisfy
To do the trick, therefore, the FORCE must exceed µN
31. Deriving and solving equations of motion for systems of particles :-
General procedure for deriving and solving equations of motion for systems of particles
1. Introduce a set of variables that can describe the motion of the system.
2.Write down the position vector of each particle in the system in terms of these variables.
3. Differentiate the position vector(s), to calculate the velocity and acceleration of each particle
in terms of variables;
4. Draw a free body diagram showing the forces acting on each particle. You may need to
introduce variables to describe reaction forces. Write down the resultant force vector.
5.Write down Newton’s law F=ma for each particle. This will generate up to 3 equations of
motion (one for each vector component) for each particle.
6. If you wish, you can eliminate any unknown reaction forces from Newton’s laws. The result
will be a set of differential equations for the variables defined in step (1).
32. Example 1:Trajectory of a particle near the earth’s surface (no air resistance)
At time t=0, a projectile with mass m is launched from a position
With initial vector .Calculate its trajectory as a function of time.
Solution :-
1. Introduce variables to describe the motion:
We can simply use the Cartesian coordinates of the particle.
2.Write down the position vector in terms of these variables
3.Differentiate the position vector with respect to time to find the acceleration. For this example, this is trival.
33. 4. DRAWTHE FREE BODY DIAGRAM : The only force acting on the particle is gravity – the
free body diagram is shown in the figure. The force vector follows as F= -mgk
5. Write down Newton’s laws of motion :
The vector equation actually represents three separate differential equations of motion
so the position and velocity vectors are