2nd Grade Science Question of the Day

1. Cardboard
2. Paper
3. Wood (correct answer)
4. Plastic

Explanation: This question tests the skill 2-PS1-2: Testing materials and recording observations to find which is best for a purpose. Scientists test materials to find which works best. We decide what property we need—strong, waterproof, flexible, absorbent. We test each material the same way. We record observations or measurements. Then we compare results to find which material is best for our purpose. In this test, Carlos wanted to find which material is best for building a bridge. He tested paper, cardboard, plastic, and wood by stacking books until each bent. He measured how many books each material could hold before bending. The correct answer is C (Wood) because the test results show wood held the most books. Wood held 9 books, which means it is the strongest and best for building a bridge. When we look at the data, wood performed better than plastic (7 books), cardboard (5 books), and paper (1 book). Choice B (Paper) is incorrect because paper held only 1 book, making it the weakest material for a bridge. This error happens when students choose familiar materials without checking which performed best in the test. To help students analyze tests: First identify PURPOSE—what are we trying to find? Then find which material BEST achieved that purpose using the data. Teach students to read tables/charts—find material name, then find result. Practice comparing numbers—'9 is more than 7, so wood held more than plastic.' Use sentence frames: 'The test shows wood held 9 books. This means wood is best for a strong bridge.' Emphasize data over opinion—'I like plastic better' doesn't matter; 'wood held 9 books' is the data. Watch for: Students who choose based on familiarity or preference, misread numbers, confuse materials, or reverse observations. Have students point to specific data that supports their answer.