Texas TEKS 6.5.C

Science6th GradeRecurring themes and concepts

The Standard

analyze how differences in scale, proportion, or quantity affect a system's structure or performance

Texas Essential Knowledge and Skills for Science

Teacher's field guide

What Students Need to Do: Students compare versions of a system that differ in size, amount, or part-to-part ratio. They use measurements or observations to explain how the change affects shape, strength, speed, capacity, or another result.
What Mastery Looks Like: Students identify what changed and describe the effect using data. They can predict how another change would affect the system and support the prediction with a clear pattern.
Common Misconceptions: Students may think larger systems always work better or hold more. They may assume doubling every length only doubles the material needed. They may also expect a small model and a full-size system to perform the same way.
How to Assess It: Exit ticket: Show bridge spans of 10, 20, and 30 centimeters holding 40, 22, and 12 washers. Ask students to describe the pattern and explain how span affects performance.

Lesson moves

Build index-card bridges with supports 10, 20, and 30 centimeters apart, then graph the number of washers each bridge holds.
Discuss: Why might a model skyscraper stay upright while a full-size copy of the same shape needs extra supports?
Match system, change, and outcome cards, then defend each match with a sentence using measurement evidence.
Compare bicycle gear sizes and explain how the front-to-rear gear ratio changes pedaling force and speed.

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