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Grade 7 · Science · Unit 10 of 10

Structures & Forces

Shapes, balance and forces

What your child practises

Solid, frame and shell structures, centre of gravity and stability, symmetry, and the size, direction and point of application of forces, including tension, compression, torsion and shear.

Nunavut Curriculum approved guide: Nunavut adaptation of Alberta Science 7–9 (2003), Unit D: Structures and Forces · kinds of structures, forces and how structures stay stable

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    The weight of a bridge itself is called its…

    • wind load
    • live load
    • dead load
    • torsion load

  2. Question 2

    A dancer on a tightrope holds a long pole. How does it help?

    • It removes the force of gravity
    • It makes the rope longer
    • It adds heat to the dancer
    • It helps keep the centre of gravity over the rope

  3. Question 3

    In '800 newtons downward at the top of a post', what does 'downward' tell you?

    • the mass of the post
    • the direction of the force
    • the point of application
    • the magnitude of the force

  4. Question 4

    A truck driver loads heavy crates on the bottom and light ones on top. Why?

    • It makes the truck lighter
    • It lets the load roll more easily
    • It keeps the centre of gravity low
    • It makes the load look neat

  5. Question 5

    Solid, frame or shell structure? Sort each one.

    Sort into: 🧱 solid · 🏗️ frame · 🥚 shell

    • 🔺a stone pyramid
    • 🧱a concrete gravity dam
    • 🥫a tin can
    • ⛑️a bicycle helmet
    • 🚲a bicycle frame
    • 📡a radio tower

  6. Question 6

    A beam bends under a load. The top edge is squeezed and the bottom edge is stretched. The top is under…

    • no force
    • compression
    • torsion
    • tension

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