Study with the several resources on Docsity
Earn points by helping other students or get them with a premium plan
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
Prof. Dasmaya Sidhu delivered this lecture at National Institute of Industrial Engineering for Basic Mechanical Engineering course. It includes: Mechanics, Newton, Laws, Problem, Solving, Strategy, Force, Vectors, Equilibrium, Free, Body, Diagrams, Moment
Typology: Slides
1 / 28
This page cannot be seen from the preview
Don't miss anything!
2
Contents 1. Introduction to mechanics & SI Units Week 12. Newton’s laws3. Problem Solving Strategy 1. Force Vectors Week 22. Vector operators, Dot product3. 2D & 3D vectors 1. Equilibrium Week 32. Free body diagrams 3. 2D forces & 3D forces 3. 2D forces & 3D forces 1. Moment of a force: 2D & 3D Scalar2. Moment of a Force: 3D Vector Week 43. Couples and Equivalent Systems4. Introduction to Distributed Loads 1. Rigid body equilibrium in 2D Week 52. Rigid body equilibrium in 3D3. Two- and Three-Force Members 1. Method of Joints (2D Trusses) Week 62. Method of Sections (2D Trusses)3. Space Trusses (3D Trusses)^3 st (^) Week 7 1 Sessional Exam docsity.com
5
Why Basic Mechanical Engineering for Electrical Engineers? ^ No engineer can work in isolation of the other branches as any product requires manyengineering branches ^ Knowledge is never wasted or useless ^ Design of an electrical motor or a transformer without the knowledge of engineering
6 mechanics, thermodynamics etc. As an electrical engineer you need the assistance of the other engineers (Civil or mechanical)for designing the motor body, transformer , laying transmission lines or designing of electricalpoles etc. If you have undergone these courses, it will help you understand their work
. docsity.com
Mechanical Engineering is the second largest engineering profession (After ElectricalEngineering). Mechanical Engineering includes Statics ,Dynamics and kinematics^ The study of Forces and their affect on moving and
8 non-moving bodies Heat and Energy (Thermodynamics) The study of energy and energy conversion. Fluid Mechanics- The study of liquids and gases and forces acting on them
9 Mechanics Statics Dynamics Deals with the study of bodies at^ rest^ Deals with the study of bodies in
11 Absolute^ = Something that does not depends on anything else. Relative^ = Something that is dependent on other things. Length ,time, and mass are absolute quantities
A fundamental quantity is any physical quantity from which every other quantities can begenerated or derived. There are seven fundamental quantities which are
Length, Time, Mass, Temperature, Electric Current , Amount of Light and Amount of matter
Length^ Length is a measurement of distance or dimension. Length most commonly refers tothe longest dimension of an object.^ Length is a fundamental unit, from which other units are defined like
volume, area^ etc.
12 Time^ Time is way for us to measure the span between the events.^ Time is a part of the measuring system used to sequence the events, to compare thedurations of events and the intervals between them.^ Time is used to define other quantities – such as velocity, acceleration etc.^ We can neither halt nor prolong Time. We cannot recover a single moment of existence.The flow of time is beyond our control.Time has only one dimension from the past through the present to the future. It isinevitable, unrepeatable and irreversible.
Force^ It is an essential agency which changes or tend to change the state of rest or uniformmotion of body Represents the action of one body on another. A force ischaracterized by its point of application, magnitude, and direction.^ In Mechanics, length ,time, and mass
15 Newton First Law of Motion A object will remain at rest or in uniform motion in a straight line unless acted on by anexternal, unbalanced force.
nd^ Newton 2Law of Motion An object is accelerated whenever a net external force is applied on it. This net force is equal tpthe object’s mass times its acceleration. F=m*a
17
-^ We know that objects with different masses accelerate to^ the ground at the same rate. •^ However, because of the 2nd Law we know that theydon’t hit the ground with the same force.^ Something very small (low mass) that’s changing speed veryquickly (high acceleration), like a bullet, can still have a greatforce.^ Something very small changing speed very slowly will have avery weak force
a^ b c^18 docsity.com
m^220
r Determine the force of gravitational attraction between the earth (m = 5.98 x 10
24 kg) and a 70- kg person standing at sea level, a distance of 6.38 x 10
6 m from earth's center. The solution of the problem involves substituting known values of G (6.673 x 10
-11^22 N m/kg), m^1 (^24) (5.98 x 10kg), m(70 kg) and d (6.38 x 10^2 6 m) into the universal gravitation equation and solving for F. The solution is as follows:g
F= 686 Ng^
