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Mechanical Science I Pdf notes

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Number of Pages: 139 Pages
File size: 3 MB
Suitable for:

  • Diploma in Mechanical Engineering (Production & Plant) Module I: Mechanical Science
  • Craft Certificate in Mechanical Engineering (Production & Plant) Module I
  • Craft Certificate in Welding and Fabrication Module I: Mechanical Science I
  • Mechanical Production Technician (KNQF Level 5): Apply Mechanical Science Principles

DETAILED NOTES Plus Revision exercise with Answers
Topics covered/
Chapter 1: Forces
Chapter 2: Moments of Forces
Chapter 3: Friction
Chapter 4: Motion
Chapter 5: Energy, Work And Power

Category:

Description

1.0 CHAPTER ONE: FORCES

  • 1.1 INTRODUCTION
  • 1.1.1 Effects of a force
  • 1.1.2 Scalar and Vector Quantities
  • 1.2 FORCE VECTORS
  • 1.2.1 Force Systems
  • Concurrent forces
  • Collinear forces
  • Coplanar forces
  • 1.2.2 Vector Addition
  • 1.3 RESULTATION AND RESOLUTION OF FORCES
  • 1.3.1 Resolution into Perpendicular Components
  • 1.3.2 The Resultant of Two Coplanar Forces
  • 1.3.3 Analysis/Calculation Method of Resultation
  • 1.4 STATEMENT AND APPLICATION OF THEOREMS OF FORCES
  • 1.4.1 Parallelogram Theorem
  • The Parallelogram of Forces Method
  • 1.4.2 Triangle Theorem
  • Triangle of Forces Method
  • 1.4.3 Polygon Theorem
  • Polygon of Forces Method
  • 1.4.4 Coplanar Forces in Equilibrium
  • Bow’s Notation
  • 1.4.5 Lami’s Theorem
  • 1.4.6 Equilibrant
  • 1.5 SUMMARY
  • EXTENDED ANSWER/KNEC SAMPLE QUESTIONS

2.0 CHAPTER TWO: MOMENTS OF FORCES

  • 2.1. INTRODUCTION 2.1.1 Directions of Moments
  • 2.1.2 Principle of Moments
  • 2.2 EQUILIBRIUM AND CENTRE OF GRAVITY (CoG)
  • 2.2.1 Stable Equilibrium
  • 2.2.2 Unstable Equilibrium
  • 2.2.3 Neutral Equilibrium
  • 2.2.4 Factors Affecting Stability
  • Area of Base
  • Position of CoG
  • 2.3 CALCULATION OF MOMENTS
  • 2.4 CALCULATION OF REACTIONS
  • 2.4.1 Single Load on Beam
  • 2.4.2 Multiple Loads on Beams
  • 2.4.3 Making Reactions at the Supports to be Equal
  • Changing Position of Load
  • Changing Magnitude of Load
  • 2.5 VARIGNON’S THEOREM
  • 2.6 COUPLES
  • 2.6.1 Applications of Couples
  • EXTENDED ANSWER/KNEC SAMPLE QUESTIONS

3.0 CHAPTER THREE: FRICTION

  • 3.1 TYPES OF FRICTION
  • 3.1.1 Dry Friction.
  • 3.1.2 Fluid Friction
  • 3.1.3 Internal Friction.
  • 3.2 COEFFICIENT OF FRICTION
  • 3.3 LAWS OF FRICTION
  • 3.4 ANGLE OF FRICTION AND ANGLE OF REPOSE
  • 3.4.1 Angle of Friction
  • 3.4.2 Angle of Repose
  • 3.4.3 Motion up a plane with the pulling P force parallel to the plane
  • 3.4.4 Motion down a plane with the pulling force P parallel to the plane
  • 3.4.5 Motion up a plane due to a horizontal force P
  • 3.5 APPLICATIONS OF FRICTION
  • 3.6 ADVANTAGES OF FRICTION
  • 3.7 DISADVANTAGES OF FRICTION
  • 3.8 INCREASING AND REDUCING FRICTION
  • Increasing
  • Reducing
  • 3.8 SUMMARY
  • EXTENDED ANSWER/KNEC SAMPLE QUESTIONS

4.0 CHAPTER FOUR: MOTION

  • 4.1 INTRODUCTION/DEFINITIONS
  • 4.1.1 Simple Calculations
  • 4.2 NEWTON’S LAWS OF MOTION
  • 4.2.1 Newton’s First Law of Motion (Law of Inertia)
  • 4.2.2 Newton’s Second Law of Motion (Law of Momentum)
  • 4.2.3 Newton’s Third Law of Motion (Action-Reaction Law)
  • 4.3 GRAPHS OF MOTIONS
  • 4.3.1 Displacement-Time Graph
  • 4.3.2 Velocity-Time Graph
  • 4.3.3 Acceleration-Time Graph
  • 4.4 EQUATIONS OF MOTION
  • 4.4.1 Linear Motion
  • First equation
  • Second equation
  • Third equation
  • Fourth equation
  • 4.4.2 Motion under Gravity
  • Free Fall
  • Vertical projection
  • Time of flight
  • Maximum height reached
  • Velocity to return to point of projection
  • 4.4.3 Horizontal projection
  • 4.4.4 Angular Motion (Uniform Circular Motion)
  • The radian
  • Angular velocity
  • Angular acceleration
  • Centripetal force
  • Motion of Bicycle Rider Round Circular Track
  • Motion of Car (or Train) Round Circular Track
  • Motion in a vertical circle
  • EXTENDED ANSWER/KNEC SAMPLE QUESTIONS

5.0 CHAPTER FIVE: ENERGY, WORK AND POWER

  • 5.1 ENERGY
  • 5.1.1 Potential Energy/Energy at Rest
  • 5.1.2 Kinetic Energy/Energy of Motion
  • 5.1.3 Conservation of Energy
  • 5.1.4 Linear Momentum
  • 5.1.5 Conservation of Linear Momentum
  • 5.1.6 Elastic and inelastic collisions
  • 5.2 WORK
  • 5.2.1 Calculating Work
  • 5.3 POWER
  • EXTENDED ANSWER/KNEC SAMPLE QUESTIONS
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