Mechanical Systems

Unit Overview:
Machines are used for many purposes in our daily lives when we need to transfer energy into motion or move materials in a controlled way. In learning about mechanical devices, students investigate how components are linked so that energy is transferred efficiently and desired functions are performed. A comparison of past and present technologies helps students recognize that different approaches have been used over time to meet common needs. Evaluations of efficiency, effectiveness and impacts on daily life, the community and the environment are important considerations in this unit.


  1. How is energy transferred in mechanical devices?
  2. How do mechanical devices provide for controlled application of energy in ways that are efficient, effective and responsible?

These notes are from EdQuest, a site for student information and resources for grade eight.  These are NOT my class notes, but they offer a great alternative with the same information.  To view the class notes, please visit the SECURED PAGE from the Science 8 menu at the top of this page.  You will need the password to view the secure page.

Section 1 – History of simple machines, simple and complex machines
Section 2 – Science of work, hydraulics
Section 3 – Evaluating mechanical devices


Mechanical systems podcasts for your listening pleasure 🙂  Hope they help!

Unit Introduction – Screencast
History of simple machines –  Screencast    Podcast #1
Types of Simple Machines –  Screencast    Podcast #2
Effects of Simple Machines  – Podcast #3
Complex machines and gears – Screencast    Podcast #4 
Mechanical advantage and speed ratio –  Screencast
Friction and Efficiency  –  Screencast
Work  –  Screencast
Hydraulics  –  Screencast
Evaluating DevicesScreencast




The following links are for a few examples of some really well done machines.  For more information on this project, you can email me here.

Machine 1 video       Machine 1 explanation

Machine 2 video      Machine 2 explanation

Machine 3

Machine 4


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