---
title: Hard, Soft, Rough, Smooth
created: '2026-05-26'
updated: '2026-05-26'
type: lesson_topic
subject: science
tags:
- science
- grade-2
- homeschool
- ngss
standard: 2-PS1, 2-PS4
phase: 1
phase_name: 'FALL: Physical Science - Matter and Its Interactions (Weeks 1-10)'
weeks:
- 3
source: ''
---

# Hard, Soft, Rough, Smooth

Second grade science topic covering hard, soft, rough, smooth. Part of Phase 1 (FALL: Physical Science - Matter and Its Interactions (Weeks 1-10)).

## Key Concepts
Detailed examination of surface properties
- **Objectives:** Compare and contrast material textures
- **Activities:**
  - Touch-and-tell mystery bags
  - Surface texture rubbings
  - Group materials by hardness
- **Assessment:** Property comparison worksheet

### Week 4: Flexible vs. Rigid Materials
**Focus:** Testing material flexibility
- **Objectives:** Test and describe flexibility
- **Activities:**
  - Bend test with various materials (straws, paper, rubber bands, sticks)
  - Build a flexible bridge challenge
  - Document which materials bend vs. break
- **Assessment:** Bridge building project

### Week 5: Absorbent Materials
**Focus:** Testing how materials interact with water
- **Objectives:** Predict and test absorbency
- **Activities:**
  - "Which material soaks up the most?" experiment
  - Paper towel brand test
  - Create absorbency ranking chart
- **Assessment:** Data chart with predictions vs. results

### Week 6: Solids, Liquids, Gases Introduction
**Focus:** Understanding states of matter
- **Objectives:** Identify and classify matter by state
- **Activities:**
  - Sort household items by state
  - Demonstrate gas with balloons
  - Observe liquid pouring vs. solid stacking
- **Assessment:** States of matter sorting activity

### Week 7: Solids Deep Dive
**Focus:** Properties of solid matter
- **Objectives:** Describe solid characteristics
- **Activities:**
  - Build structures with different solids
  - Test which solids sink or float
  - Create solid property cards
- **Assessment:** Sink/float prediction experiment

### Week 8: Liquids Deep Dive
**Focus:** Properties of liquid matter
- **Objectives:** Describe liquid characteristics
- **Activities:**
  - Pouring and measuring liquids
  - Oil and water layering experiment
  - Test liquid flow rates (honey, water, oil)
- **Assessment:** Flow rate observation chart

### Week 9: Gases and Air
**Focus:** Understanding invisible matter
- **Objectives:** Recognize gases take up space
- **Activities:**
  - Air bubble experiments
  - Blow up balloons without touching
  - Submerge cup in water (air pocket demo)
- **Assessment:** Gas property explanation

### Week 10: States of Matter Review & Testing
**Focus:** Review and assess understanding
- **Objectives:** Identify all three states of matter
- **Activities:**
  - States of matter scavenger hunt
  - Review games and sorting activities
  - Unit quiz through hands-on demonstration
- **Assessment:** End-of-unit project or demonstration

---

## Standards
2-PS1, 2-PS4

## Related Topics
[[introduction-to-scientific-observation]], [[properties-of-materials]]

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*Generated from curriculum data*  ^[[raw/curriculum/science]]