Introduction to Engineering and Technology Concepts

1
Introduction to Engineering and Technology
Concepts

• Unit Three
• Chapter Three Using Energy

2
Instructions for Success

• Each chapter of every unit will begin with a
  Mindjog. This is a warm up question that you
  should answer in your workbook in the proper
  chapter.
• Please take notes as you move through the
  presentations in the notebook that has been
  provided.
• Sections will come up in each presentation with
  an assignment notice. Turn to the section
  detailed on the slide in your workbook and
  complete the assignment before proceeding.
• Good luck!

3
Objective

• Students will define the types of motion gained
  by using energy.

4
Mindjog!

• On your worksheet, please respond to the
  following question 
• Think of a piece of technology that you use
  everyday. Now list the ways in which energy is
  used to make the artifact work for you.

5
Quick Review

• In the past two chapters, we have defined energy
  as the ability to do work.
• We have defined work as applying a force that
  moves a mass a distance in the direction of an
  applied force.
• Work always involves moving a load (Wright,
  2004).

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Types of Motion

• When using energy to do work, motion is always
  present.
• The three important types of motion include
  rotary motion, linear motion, and reciprocating
  motion.
• Rotary Motion spinning around on an axis
• Linear Motion moving in a straight line
• Reciprocating Motion moving back and forth
  (Wright, 2004).

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Two Types of Systems

• There are two basic types of systems dedicated to
  change the type, direction, or speed of a force.
  
• They are Mechanical Power and Fluid Power Systems
  (Wright, 2004)

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Mechanical Power Systems

• Mechanical systems use moving parts to transfer
  the motion.
• It is the oldest method of transferring energy.
• There are six common techniques lever, crank,
  gears, cam, gear and rack, pulleys and V-belt
  (Wright, 2004).

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Mechanical Power Systems (continued)

• Lever- a device that changes the direction of a
  linear force.
• Crank a pivot point near the outside edge of a
  wheel or disk that changes reciprocating motion
  in to rotating motion.
• Gears Two or more wheels with teeth on their
  circumference that change the direction of a
  rotating force.
• Cam A pear-shaped disk with an of center pivot
  point that is used to change rotating motion into
  reciprocating motion.
• Gear and rack rotating gear meshes with a bar
  that has gear teeth along its length that changes
  rotating motion into linear motion.
• Pulleys and V-Belt two pulleys with a V-belt
  stretched between them that change the speed or
  power of a motion (Wright, 2004).

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Fluid Power Systems

• Fluid Power Systems use either liquids or gases
  to transfer power from one place to another
  (Wright, 2004).
• Systems that use air are called pneumatic
  systems.
• Liquids are used in hydraulic systems (Wright,
  2004).

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Assignment 1

• Please turn to the section in your workbook
  entitled, Unit Three, Chapter Three Using
  Energy.
• Complete the extension questions under the
  Assignment 1 header before moving onto the
  next section of slides.

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BEFORE MOVING ON

• Did you complete the Assignment 1 Section
  under the Unit Three, Chapter Three Using
  Energy section of your workbook?
• If you have, please proceed to the next slide.

13
Unit Three Completed!

• Please close this presentation and launch the
  folder entitled, Unit 4, Chapter One.

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References

• Wright, R. (2004) Technology The
  Goodheart-Willcox Company, Inc.