Standards Alignment
- 2-PS1-3 primary
Make observations to construct an evidence-based account of how an object made of a small set of pieces can be disassembled and made into a new object.
View 26 supporting standards
- TEKS.SC.2.01A supporting
ask questions and define problems based on observations or information from text, phenomena, models, or investigations; - TEKS.SC.2.01B supporting
use scientific practices to plan and conduct simple descriptive investigations and use engineering practices to design solutions to problems; - TEKS.SC.2.01C supporting
identify, describe, and demonstrate safe practices during classroom and field investigations as outlined in Texas Education Agency-approved safety standards; - TEKS.SC.2.01D supporting
use tools, including hand lenses, goggles, heat-resistant gloves, trays, cups, bowls, beakers, notebooks, stream tables, soil, sand, gravel, flowering plants, student thermometer, demonstration thermometer, rain gauge, flashlights, ramps, balls, spinning tops, drums, tuning forks, sandpaper, wax paper, items that are flexible, non-flexible items, magnets, hot plate, aluminum foil, Sun-Moon-Earth model, and frog and butterfly life cycle models to observe, measure, test, and compare; - TEKS.SC.2.01E supporting
collect observations and measurements as evidence; - TEKS.SC.2.01F supporting
record and organize data using pictures, numbers, words, symbols, and simple graphs; and - TEKS.SC.2.01G supporting
develop and use models to represent phenomena, objects, and processes or design a prototype for a solution to a problem. - TEKS.SC.2.02A supporting
identify basic advantages and limitations of models such as their size, properties, and materials; - TEKS.SC.2.02B supporting
analyze data by identifying significant features and patterns; - TEKS.SC.2.02C supporting
use mathematical concepts to compare two objects with common attributes; and - TEKS.SC.2.02D supporting
evaluate a design or object using criteria to determine if it works as intended. - TEKS.SC.2.03A supporting
develop explanations and propose solutions supported by data and models; - TEKS.SC.2.03B supporting
communicate explanations and solutions individually and collaboratively in a variety of settings and formats; and - TEKS.SC.2.03C supporting
listen actively to others' explanations to identify important evidence and engage respectfully in scientific discussion. - TEKS.SC.2.04A supporting
explain how science or an innovation can help others; and - TEKS.SC.2.04B supporting
identify scientists and engineers such as Alexander Graham Bell, Marie Daly, Mario Molina, and Jane Goodall and explore what different scientists and engineers do. - TEKS.SC.2.05A supporting
identify and use patterns to describe phenomena or design solutions; - TEKS.SC.2.05B supporting
investigate and predict cause-and-effect relationships in science; - TEKS.SC.2.05C supporting
measure and describe the properties of objects in terms of size and quantity; - TEKS.SC.2.05D supporting
examine the parts of a whole to define or model a system; - TEKS.SC.2.05E supporting
identify forms of energy and properties of matter; - TEKS.SC.2.05F supporting
describe the relationship between structure and function of objects, organisms, and systems; and - TEKS.SC.2.05G supporting
describe how factors or conditions can cause objects, organisms, and systems to either change or stay the same. - TEKS.SC.2.06A supporting
classify matter by observable physical properties, including texture, flexibility, and relative temperature, and identify whether a material is a solid or liquid; - TEKS.SC.2.06B supporting
conduct a descriptive investigation to explain how physical properties can be changed through processes such as cutting, folding, sanding, melting, or freezing; and - TEKS.SC.2.06C supporting
demonstrate that small units such as building blocks can be combined or reassembled to form new objects for different purposes and explain the materials chosen based on their physical properties.
Lesson Overview
This Grade 2 science lesson engages students in making careful observations to understand how objects made of a small set of pieces can be taken apart and put together to form new objects. Through hands-on activities with building blocks or similar materials, students will explore the structure and properties of matter by disassembling and reassembling objects. They will record their observations, ask questions, and construct evidence-based explanations about how the pieces fit together and how new objects can be created. This lesson integrates scientific practices such as planning investigations, using tools, collecting data, and developing models, aligned with NGSS and TEKS standards.
Learning Objectives
- Observe and describe how an object made of a small set of pieces can be taken apart and reassembled into a new object.
- Ask questions and define problems based on observations of objects and their pieces.
- Plan and conduct simple investigations to explore how pieces can be combined to make new objects.
- Use tools and materials safely to observe, measure, and record data about objects and their parts.
- Construct explanations supported by observations and data about how objects can be disassembled and reassembled.
Success Criteria
- Students can identify and describe the pieces that make up an object.
- Students can safely disassemble an object made of small pieces and record observations about the process.
- Students can reassemble the pieces to create a new object and explain how it differs from the original.
- Students can ask relevant questions and use observations to support their explanations.
- Students can communicate their findings clearly using drawings, words, or simple models.
Prerequisite Knowledge
Students should understand that objects are made of parts and that these parts can be taken apart and put back together. They should have basic experience with observing and describing objects and using simple tools like hand lenses or notebooks to record observations.
Key Vocabulary
- object
- pieces
- disassemble
- reassemble
- observation
- evidence
- model
- property
- structure
- investigation
Materials and Resources
- Sets of building blocks or small construction toys (e.g., LEGO bricks, magnetic tiles)
- Hand lenses
- Notebooks or observation sheets
- Pencils or crayons
- Safety goggles (optional)
- Containers or trays to hold pieces
Teacher Preparation
- Prepare sets of objects made from a small number of pieces that can be easily taken apart and reassembled.
- Prepare observation sheets with prompts for students to record what they see and do.
- Review safety procedures for handling small pieces and tools.
- Arrange the classroom to allow small groups to work with materials comfortably.
- Prepare guiding questions to support student inquiry and discussion.
Detailed Lesson Notes
Understanding Objects and Their Pieces
An object is something that can be seen and touched and is made up of parts called pieces. These pieces fit together to form the whole object. For example, a toy car might be made of wheels, a body, and windows. Understanding that objects are made of pieces helps us see how they can be taken apart and put back together in new ways.
Observing and Describing Pieces
Observations are careful notices of what we see, feel, or sometimes hear or smell. When we look at an object made of pieces, we can observe the size, shape, color, and texture of each piece. Using tools like hand lenses can help us see details. Recording these observations with drawings or words helps us remember and share what we learned.
Disassembling Objects Safely
Disassembling means taking an object apart. When students take apart objects made of small pieces, they should do so gently to avoid breaking pieces or losing them. Safety includes wearing goggles if needed and keeping pieces organized in trays or containers. This process helps students see how the pieces fit together and what each piece looks like.
Reassembling Pieces to Make New Objects
Reassembling means putting pieces back together, sometimes in a new way to make a different object. For example, blocks taken apart from a tower can be used to build a bridge. This activity shows that the same pieces can be used to create many different objects. Students learn about creativity, design, and the properties of materials that make this possible.
Constructing Evidence-Based Explanations
After observing and experimenting, students use their observations as evidence to explain what they learned. An evidence-based explanation is one that uses facts and data collected during the investigation. For example, a student might explain that the pieces fit together because they have matching shapes or connectors. This practice helps develop scientific thinking and communication skills.
Worked Examples
Worked Example 1
Scenario
You have a small toy made of 5 blocks connected together. You take it apart and find the blocks are different colors and sizes. You then use the same blocks to build a small house. How does your observation help explain how the toy can be changed?
Explanation
The observation that the toy is made of separate blocks of different colors and sizes shows that it can be taken apart and rearranged. Because the blocks are individual pieces, they can be connected in new ways to build different objects, like a house. This supports the idea that objects made of small pieces can be disassembled and reassembled into new forms.
Answer Guide
Because the toy is made of separate blocks, I can take it apart and use the blocks to build a new object like a house. The different colors and sizes help me decide how to put the blocks together in a new way.
Engage
Teacher Activity
Show students a simple object made of a few pieces, such as a small toy or a model made from building blocks. Ask them what they notice about the object and if they think it can be taken apart.
Student Activity
Students share their observations and ideas about the object and whether it can be disassembled.
Explanation
This phase activates prior knowledge and curiosity about objects and their parts, setting the stage for investigation.
Examples
- Students notice the object is made of parts or pieces.
- Students express curiosity about how the pieces fit together.
Explore
Teacher Activity
Provide each group with an object made of a small set of pieces. Guide students to carefully take the object apart, observe each piece, and record their observations using drawings or words.
Student Activity
Students disassemble their objects, observe the pieces closely using hand lenses if available, and record details about size, shape, color, and texture.
Explanation
Hands-on exploration allows students to directly observe the parts of an object and understand how it can be taken apart.
Examples
- Students identify and describe individual pieces.
- Students record observations about the pieces' properties.
- Students handle pieces carefully and keep them organized.
Explain
Teacher Activity
Lead a discussion where students share their observations and explain how the pieces fit together to make the original object. Introduce the idea that the pieces can be put together in new ways to make different objects.
Student Activity
Students describe their observations and explain how the pieces connect. They suggest ways to reassemble pieces to create new objects.
Explanation
This phase helps students articulate their understanding and connect observations to concepts of structure and function.
Examples
- Students explain the connections between pieces.
- Students propose new ways to assemble the pieces.
- Students use evidence from their observations in explanations.
Elaborate
Teacher Activity
Challenge students to reassemble their pieces to create a new object different from the original. Encourage them to plan their design, try it out, and describe how their new object is different or similar.
Student Activity
Students design and build a new object using the same pieces, then describe their creation and how it differs from the original.
Explanation
This phase extends learning by applying concepts to new situations and encourages creativity and problem-solving.
Examples
- Students create new objects using the same pieces.
- Students describe differences and similarities between objects.
- Students reflect on their design choices.
Evaluate
Teacher Activity
Ask students to share their evidence-based explanations about how objects can be disassembled and reassembled. Assess their ability to observe, record data, and communicate their findings.
Student Activity
Students present their observations, explanations, and new objects to the class or in small groups.
Explanation
Assessment focuses on students' understanding of the lesson objectives and their ability to use evidence in explanations.
Examples
- Students clearly explain their process and observations.
- Students use evidence to support their explanations.
- Students demonstrate understanding of object structure and properties.
Classroom Activity
Students disassemble their objects, observe the pieces closely using hand lenses if available, and record details about size, shape, color, and texture.
Guided Practice
Guided Practice 1
Prompt
What does it mean to disassemble an object?
Teacher Answer Guide
Disassemble means to take an object apart into its pieces.
Guided Practice 2
Prompt
Name two things you can observe about the pieces of an object.
Teacher Answer Guide
You can observe the size and color of the pieces.
Guided Practice 3
Prompt
If you take apart a toy made of blocks and then build a new shape with the same blocks, what have you done?
Teacher Answer Guide
You have disassembled the toy and reassembled the pieces to make a new object.
Guided Practice 4
Prompt
Why is it important to record your observations when you take apart and build objects?
Teacher Answer Guide
Recording observations helps you remember details about the pieces and explain how they fit together or how the new object is different.
Guided Practice 5
Prompt
Explain how the properties of pieces, like shape and size, affect the way you can reassemble them into new objects.
Teacher Answer Guide
The shape and size of pieces determine how they connect and fit together, so these properties affect what new objects you can build and how stable or strong they are.
Independent Practice
- Foundational: What does it mean to disassemble an object?
- Developing: Name two things you can observe about the pieces of an object.
- Application: If you take apart a toy made of blocks and then build a new shape with the same blocks, what have you done?
- Analysis: Why is it important to record your observations when you take apart and build objects?
- Challenge: Explain how the properties of pieces, like shape and size, affect the way you can reassemble them into new objects.
Independent Practice Teacher Answer Key
- 1. Disassemble means to take an object apart into its pieces.
- 2. You can observe the size and color of the pieces.
- 3. You have disassembled the toy and reassembled the pieces to make a new object.
- 4. Recording observations helps you remember details about the pieces and explain how they fit together or how the new object is different.
- 5. The shape and size of pieces determine how they connect and fit together, so these properties affect what new objects you can build and how stable or strong they are.
Guiding Questions
- What parts make up this object?
- How can we take it apart safely?
- What do the pieces look like?
- Can we use these pieces to make something new?
- How do your observations help explain how the pieces fit together?
Common Misconceptions
- Students may think that objects cannot be taken apart without breaking them, but many objects are designed to be disassembled and reassembled.
- Students might believe that pieces can only be put back together in the original way and not in new ways.
- Some students may confuse disassembling with destroying an object rather than carefully taking it apart.
Differentiation
Support and Intervention
Provide step-by-step guidance and visual aids for disassembling objects. Use objects with fewer and larger pieces for easier handling. Allow students to work in pairs or small groups for support.
English-Language Learner Support
Use pictures and gestures to explain vocabulary like disassemble and reassemble. Provide sentence starters for describing observations. Use bilingual labels on materials if possible.
Advanced and Extension
Challenge students to design and build more complex new objects from the pieces. Encourage students to explain their reasoning using scientific vocabulary. Have students compare different objects and their pieces to identify patterns.
Assessment
- Observe students as they disassemble and reassemble objects, noting their ability to handle pieces safely and record observations.
- Listen to student explanations during discussions to check understanding of how pieces fit together.
- Review students' observation sheets for completeness and accuracy.
- Draw an object made of pieces and label its parts.
- Write one sentence explaining how you can make a new object from the pieces of another.
- Name one property of a piece that helps you decide how to connect it to others.
- Have students create a model of an object from pieces and write a short explanation of how they disassembled and reassembled it.
- Give a quiz with questions about the meaning of disassemble, properties of pieces, and the process of making new objects from pieces.
Answer Guide
- What does it mean to disassemble an object?
Answer: Disassemble means to take an object apart into its pieces. - Name two things you can observe about the pieces of an object.
Answer: You can observe the size and color of the pieces. - If you take apart a toy made of blocks and then build a new shape with the same blocks, what have you done?
Answer: You have disassembled the toy and reassembled the pieces to make a new object. - Why is it important to record your observations when you take apart and build objects?
Answer: Recording observations helps you remember details about the pieces and explain how they fit together or how the new object is different. - Explain how the properties of pieces, like shape and size, affect the way you can reassemble them into new objects.
Answer: The shape and size of pieces determine how they connect and fit together, so these properties affect what new objects you can build and how stable or strong they are.
Real-Life Application
Encourage students to find an object at home made of small pieces (like a puzzle or building set) and practice taking it apart and making a new object. They can share their observations and new creations with the class.
Homework or Home Connection
- Encourage students to find an object at home made of small pieces (like a puzzle or building set) and practice taking it apart and making a new object. They can share their observations and new creations with the class.
Lesson Summary
In this lesson, students learned that many objects are made of small pieces that can be taken apart and put back together in new ways. By observing and recording details about the pieces, students constructed explanations about how objects can be disassembled and reassembled to create new objects. This hands-on experience helps students understand the structure and properties of matter and develops their scientific skills in observation, investigation, and communication.
Teacher Notes
Use the exact standards alignment and retrieved-source provenance stored with this enrichment.