Units 1 Lecture.pdf Mechanical Science PDF

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Introduction to MEE1002

Introduction & Unit 1: Units and Measurements Mechanical Engineering Science (MEE1002)

Lecturer: Mr. Kirkland Rowe ([email protected]) Office Location: Mechanical Staff Room (first floor) Office Hours: Tuesdays, 10am-12pm Lecture Sessions: Mondays (4:00 pm to 6:00 pm) – (1A 66/67) Tuesday (8:00 am to 10:00 am) – (1A 66/67) Wednesdays (7:00 pm to 9:00 pm) – (47C-3) Tutorial Sessions: Mondays 6-7pm (1A-31) Tuesdays 5-6pm (47B-7) Wednesday 11am-12pm (1A-30) Wednesday 1-2pm & 2-3pm (1A-31)

How to access course material: https://kirkengine.gnomio.com/course/view.php?id=14

Introduction to MEE1002

Assessment Procedures

Upon completion of the course, the student should: • • • •

Understand the SI system of units and converting to other units Understand the principles of Newtonian dynamics Understand the principles of friction Understand the above in specific applications including simple structures, linear motion, work, energy, power

End-of-semester Examination Assignments Class tests (week 6 & 12) Project (additional assignments)

50% 15% 20% 15%

Unit 1 – Unit and Measurement Recommended Texts Upon completion of UNIT 1, the student should be able to: - Hibbeler, R.C. Engineering Mechanics (Statics & Dynamics). 12th Edition. 2010. - Beer, F. & Johnston, R. Vector Mechanics for Engineers (Statics). McGraw Hill.

1) Explain the SI system of units 2) Explain the conversion of the SI system units to other practical and non-metric units 3) Discuss the differences between absolute and relative units 4) Explain the use of dimensional analysis in problem solving 5) Discuss accuracy in measurements

Unit 1 – Unit and Measurement A unit of measurement is a standardized quantity of a physical property, used as a factor to express occurring quantities of that property.

What are SI Units?

The definition, agreement and practical use of units of measurement have played a crucial role in human endeavors from early ages up to this day.

A system of physical units ( SI units ) based on a set of fundamental (base) units. These base units can be combined to create multiple other derived units.

Different systems of measurement used to be very common. Now there is a global standard, the International System (SI) of units, the modern form of the metric system. What is the Imperial System of units?

Conversion of SI system units to other practical/non-metric units You will first need to know the conversion factor: 2.2046 =1 Base Unit

1  = 1000 1  = 1609.433 1  = 0.3048 1=0.0254

What are some of the advantages of the SI system (versus the Imperial system)?

1  = 0.001

Conversion of SI system units

Conversion of SI system units to other practical/non-metric units

Problem 1:

There are several methods than can be used to convert units. A ratio (or fractional method) is one of the easier methods.  !" #$%& " '( ×

÷

45 ×

2.2046 = 99.208  1

Assemble the conversion factor to give a ratio.

Conversion of SI system units to other practical/non-metric units

Conversion of SI system units to other practical/non-metric units

 !" )**& " '( 200 ×

1 2.2046 =0.4409 × 1 1000

 !" +***,- " ." 1000 / ×

012" 3. "1 43" 125 2 67 !?

1 1  × = 32.8084  100/ 0.3048 

SI Derived Units

 !" $3) " -) 5 9 ×

0.0254  1  9

9

= 5 9 ×

6.4516×10:;9 = 3.226 × 10: 9 19 9

012" 3. "1 ! 2! -4'"36'...