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Grade 08 Science - EC: S8.A.3.3.1

Grade 08 Science - EC: S8.A.3.3.1

Continuum of Activities

Continuum of Activities

The list below represents a continuum of activities: resources categorized by Standard/Eligible Content that teachers may use to move students toward proficiency. Using LEA curriculum and available materials and resources, teachers can customize the activity statements/questions for classroom use.

This continuum of activities offers:

  • Instructional activities designed to be integrated into planned lessons
  • Questions/activities that grow in complexity
  • Opportunities for differentiation for each student’s level of performance

Grade Levels

8th Grade

Course, Subject

Science

Activities

  1. List 3 human-made systems.
  1. Summarize how a hub-and-spoke system functions.
  1. Investigate 3 different types of trusses that can be used on a bridge.  Which type do you think is the best to use?  Use evidence to explain your thinking.

Answer Key/Rubric

  1. Acceptable responses may include, but are not limited to:
    • railroads
    • highways
    • hub-and-spoke systems in communication
    • trusses
    • feedback controls in regulated systems
  1. Acceptable responses may include, but are not limited to:
    • The hub is a central location.
    • All of the spokes meet at the hub.
    • When a good needs to be shipped from one place to another, it moves from one spoke to the hub.
    • Then the hub transports the good to the appropriate spoke.
  1. Acceptable responses may include, but are not limited to:
    • Baltimore truss – wrought iron tension members and cast iron compression members, multiple independent tension elements, easy to assemble
    • Bowstring arch truss – diagonal load bearing members
    • Brown truss – suited for timber bridges, iron rods as tension members
    • Burr arch truss – combines arch and truss to create strong, rigid structure
    • Cantilevered truss – lower chord under compression, upper chord under tension
    • Howe truss – vertical members and diagonals that slope towards the center, vertical members are in tension, diagonal members are in compression
    • K truss – truss forms a K due to position of vertical member and 2 slanted members
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