🪙 Phase 3 - Investigation
🧪 Lab
⏱ 4 minutes
Task 5 - Test 2: Wet Strength
Place a sheet over a low cup, add 5 ml of water, wait 10 seconds, then add identical coins or washers until it tears.
Step 1 - Count how many washers each sheet holds
Enter how many identical coins or washers each sheet held before tearing.
Press "Add washer" for each product until it tears.
Step 2 - Rank best (most washers held) to worst
1st - 4pts
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2nd - 3pts
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3rd - 2pts
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4th - 1pt
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Two tests done. Let's see how much towel you actually get for your money.
What happens in Task 5
A 4-minute Phase 3 - Investigation activity. Students measure how many identical coins or washers each of four products holds before tearing when wet, then rank the products.
🎯 Learning objectives
To conduct a simple, repeatable comparative product test and to collect quantitative data on wet strength.
♿ SEN Adaptations
- Step cards with photos; pre-measured water in support mode
- Rankings only - no weighting required in support mode
🖨️ No-Tech Format
- Lab Booklet pages 3-6 with a result table and paper scorecard