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Science · Grade 8

Models, Measurement and Uncertainty

Learners discover why careful repeated measurements still differ, and report results honestly as a mean plus or minus an uncertainty. They write very large and very small quantities in scientific notation and convert metric units, test a pendulum model against data by comparing ranges, and use best-fit lines to describe trends and make predictions while recognising the limits of extrapolation.

  • 4 lessons
  • About 110 minutes
  • Measurement and models check: 10 questions
  • Ways to answer: fill in the blanks, choose an answer, estimate, draw a graph, plot points and highlight a text
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What learners will discover

  • Use repeated measurements to find a mean and a range, and report a result as mean ± uncertainty (half the range) rounded to a sensible precision.
  • Write very large and very small quantities in scientific notation and convert between metric units using the prefixes kilo, centi, milli and micro.
  • Test a model's prediction against data by comparing ranges, identifying which variables the model says matter (pendulum length matters, bob mass does not).
  • Draw and use a best-fit line to describe a trend, interpret its slope with units, make predictions by interpolation, and explain the risks of extrapolation.

Lessons

  1. Every measurement has a spread 9 steps5 practiceabout 28 min
  2. Powers of ten and metric units 9 steps5 practiceabout 25 min
  3. Testing a model: the pendulum 9 steps5 practiceabout 28 min
  4. Best-fit lines and predictions 9 steps5 practiceabout 29 min
  5. Measurement and models check 10 questions at the end

Keep exploring

Games to practice with

  • Bridge LabBuild a bridge from beams, brace it with triangles, and stay on budget.
  • Circuit Workshop 3DWire up batteries, bulbs and switches on a 3D workbench.
  • River MysterySomething changed the river. Sample sites with a limited budget, follow the evidence and find where the change begins.

More 8th grade science

Guide for grown-ups