Gihyun Kim

Topic: Introduction to Engineering Mechanics

Module 1: Course Introduction

Q. What is the difference between an engineer and a Scientist?

My A: Scientists’ main goal is to observe our surroundings and our environment to discover new phenomena and explain why it is. An engineer’s job is to use that explanation and discovery to create and invent new things.

Engineering Mechanics/Engineering Science

• The application of science to fill a human need

Units:

	English	SI (metric)
Distance	Feet (ft)	Meters (m)
Force	Pounds (lb)	Newtons (N)
Mass	slugs	Kilograms (kg)
Gravitational Constant (g)	32.2 ft/sec^2	9.81m/sec^2

Link for Module 1 video pdf: https://d396qusza40orc.cloudfront.net/phoenixassets/engineering-mechanics-statics/Module%201-Intro%20to%20Engr%20Mechanics.pdf

Module 2: Definition of a Force

1) What is a scalar quantity (m)?

• A scalar quantity is a measurement represented solely by a magnitude
  • X Direction
  • Has only magnitude

ex) Volume, Speed, Time, Mass, Density, Temperature

2) What is a vector quantity (F)?

• A quantity represented by both a magnitude and a direction
  • Has magnitude
  • Has direction

ex) Force, Velocity, Moment, Acceleration

2) What is a Force?

• A strength or energy that changes the motion of an object
  • “Push” or “Pull” on a body
  • Vector quantity

Link for Module 2 video pdf: 

Click to access Module%202-Intro%20to%20Engr%20Mechanics.pdf

Module 3: Force Representation in 2D and Resultants

Notes Taken:

Link for Module 3 video pdf: 

Click to access Module%203-Intro%20to%20Engr%20Mech.pdf

My answers to the worksheet:

Module 4: Force Representation in 3D

• Video Watched
• Practice problems solved

Summary: Identical to force representation in 2D but with an added direction of K which goes upwards.

Module 5: Particle Equilibrium

What is Newton’s 1st law of motion?

– An object at rest remains at rest and an object in motion remains in motion with a constant speed unless subjected to an unbalanced force (Static Equilibrium).

Unless Fr (Resultant Force) is applied,

At rest → Stay at rest

In motion → Stay in motion

2D = 2 Independent equations required

3D = 3 Independent equations required

How to draw a Free Body Diagram

1. Identify particle/body of interest
2. Sketch particle/body free of constraints
3. Apply external forces
4. Apply dimensions

Module 6: Systems of Particles Equilibrium

In Systems of Particles/Multibody Problems

• Assume frictionless bearings
• Assume tension in the cable/belt/rope is same throughout
• Neglect pulley weights

My workings: