Standards Alignment
- 1-PS4-2 primary
Make observations to construct an evidence-based account that objects can be seen only when illuminated.
View 27 supporting standards
- TEKS.SC.1.01A supporting
ask questions and define problems based on observations or information from text, phenomena, models, or investigations; - TEKS.SC.1.01B supporting
use scientific practices to plan and conduct simple descriptive investigations and use engineering practices to design solutions to problems; - TEKS.SC.1.01C supporting
identify, describe, and demonstrate safe practices during classroom and field investigations as outlined in Texas Education Agency-approved safety standards; - TEKS.SC.1.01D supporting
use tools, including hand lenses, goggles, heat-resistant gloves, trays, cups, bowls, beakers, sieves/sifters, tweezers, primary balance, notebooks, terrariums, aquariums, stream tables, soil samples (loam, sand, gravel, rocks, and clay), seeds, plants, windsock, pinwheel, student thermometer, demonstration thermometer, rain gauge, straws, ribbons, non-standard measuring items, flashlights, sandpaper, wax paper, items that are magnetic, non-magnetic items, a variety of magnets, hot plate, aluminum foil, Sun-Moon-Earth model, and plant and animal life cycle models to observe, measure, test, and compare; - TEKS.SC.1.01E supporting
collect observations and measurements as evidence; - TEKS.SC.1.01F supporting
record and organize data using pictures, numbers, words, symbols, and simple graphs; and - TEKS.SC.1.01G supporting
develop and use models to represent phenomena, objects, and processes or design a prototype for a solution to a problem. - TEKS.SC.1.02A supporting
identify basic advantages and limitations of models such as their size, properties, and materials; - TEKS.SC.1.02B supporting
analyze data by identifying significant features and patterns; - TEKS.SC.1.02C supporting
use mathematical concepts to compare two objects with common attributes; and - TEKS.SC.1.02D supporting
evaluate a design or object using criteria to determine if it works as intended. - TEKS.SC.1.03A supporting
develop explanations and propose solutions supported by data and models; - TEKS.SC.1.03B supporting
communicate explanations and solutions individually and collaboratively in a variety of settings and formats; and - TEKS.SC.1.03C supporting
listen actively to others' explanations to identify important evidence and engage respectfully in scientific discussion. - TEKS.SC.1.04A supporting
explain how science or an innovation can help others; and - TEKS.SC.1.04B supporting
identify scientists and engineers such as Katherine Johnson, Sally Ride, and Ernest Just and explore what different scientists and engineers do. - TEKS.SC.1.05A supporting
identify and use patterns to describe phenomena or design solutions; - TEKS.SC.1.05B supporting
investigate and predict cause-and-effect relationships in science; - TEKS.SC.1.05C supporting
describe the properties of objects in terms of relative size (scale) and relative quantity; - TEKS.SC.1.05D supporting
examine the parts of a whole to define or model a system; - TEKS.SC.1.05E supporting
identify forms of energy and properties of matter; - TEKS.SC.1.05F supporting
describe the relationship between structure and function of objects, organisms, and systems; and - TEKS.SC.1.05G supporting
describe how factors or conditions can cause objects, organisms, and systems to either change or stay the same. - TEKS.SC.1.07A supporting
explain how pushes and pulls can start, stop, or change the speed or direction of an object's motion; and - TEKS.SC.1.07B supporting
plan and conduct a descriptive investigation that predicts how pushes and pulls can start, stop, or change the speed or direction of an object's motion. - TEKS.SC.1.08A supporting
investigate and describe applications of heat in everyday life such as cooking food or using a clothes dryer; and - TEKS.SC.1.08B supporting
describe how some changes caused by heat may be reversed such as melting butter and other changes cannot be reversed such as cooking an egg or baking a cake.
Lesson Overview
In this Grade 1 science lesson, students explore how objects can be seen only when they are illuminated by a light source or when they produce their own light. Through hands-on observations, discussions, and simple investigations, students will gather evidence to understand the role of light in visibility. This lesson integrates NGSS and TEKS standards focusing on waves, light, and sound under the theme of force, motion, and energy.
Learning Objectives
- Observe and describe how objects can be seen only when light shines on them or they produce their own light.
- Ask questions and define problems based on observations related to light and visibility.
- Plan and conduct simple investigations using tools like flashlights to test how illumination affects visibility.
- Collect and record observations as evidence using pictures, words, and simple graphs.
- Develop explanations based on evidence that objects are visible only when illuminated.
Success Criteria
- Students can explain that objects are seen only when light shines on them or they give off light.
- Students ask relevant questions about how light affects visibility.
- Students safely use flashlights and other tools to observe objects in light and darkness.
- Students record observations clearly using drawings and words.
- Students share evidence-based explanations with peers.
Prerequisite Knowledge
Students should understand basic concepts of light as something that helps us see and have experience with observing objects in different lighting conditions.
Key Vocabulary
- Illuminate
- Light source
- Visible
- Shadow
- Observation
- Evidence
Materials and Resources
- Flashlights
- Various small objects (toys, blocks, paper)
- Opaque, translucent, and transparent materials (e.g., cardboard, wax paper, clear plastic)
- Dark box or a space that can be darkened
- Notebooks or recording sheets
- Crayons or markers
Teacher Preparation
- Prepare a darkened area or box for students to observe objects without light.
- Gather a variety of objects and materials for illumination tests.
- Ensure flashlights have working batteries and are safe for student use.
- Prepare recording sheets with space for drawings and words.
- Review safety practices for handling flashlights and materials.
Detailed Lesson Notes
Understanding Visibility and Illumination
Objects can only be seen when light reaches our eyes from them. This happens if the object is illuminated by an external light source, like a flashlight or the Sun, or if the object produces its own light, like a glowing toy. Without light, objects cannot be seen because no light reflects from them to our eyes.
Light Sources and Their Role
A light source is something that gives off light. Examples include the Sun, lamps, and flashlights. When light shines on an object, it reflects off the object and into our eyes, allowing us to see it. If there is no light, the object appears dark or invisible.
Types of Materials and Light Interaction
Materials can be transparent (clear plastic), allowing light to pass through; translucent (wax paper), allowing some light through but scattering it; or opaque (cardboard), blocking light completely and creating shadows. Understanding these helps explain why some objects can be seen clearly and others cannot when illuminated.
Making Observations and Collecting Evidence
Students observe objects in a dark area and then illuminate them with a flashlight. They note when objects become visible and when they disappear in darkness. Recording these observations with drawings and words helps build an evidence-based understanding that illumination is necessary to see objects.
Common Misconceptions
Students may think objects can be seen in complete darkness or that light is not necessary to see. They might confuse glowing objects with illuminated objects. It is important to clarify that either external light or the object’s own light is needed for visibility.
Worked Examples
Worked Example 1
Scenario
You place a toy inside a dark box with no light. Can you see the toy? Then you shine a flashlight inside the box. What happens?
Explanation
Without light, no light reflects from the toy to your eyes, so you cannot see it. When you shine a flashlight, light illuminates the toy, reflecting into your eyes, making the toy visible.
Answer Guide
I cannot see the toy in the dark box. When I turn on the flashlight, I can see the toy because it is lit up.
Worked Example 2
Scenario
You hold a piece of cardboard between a flashlight and a wall. What do you observe on the wall?
Explanation
The cardboard blocks the light, creating a dark shadow on the wall where the light cannot reach. This shows that opaque materials block light and prevent visibility behind them.
Answer Guide
I see a dark shadow on the wall where the cardboard blocks the light.
Engage
Teacher Activity
Introduce the lesson by asking students if they have ever tried to see something in a dark room or at night without a light. Show a flashlight and ask what it does.
Student Activity
Students share their experiences about seeing in the dark and respond to questions about what helps them see objects.
Explanation
This phase activates prior knowledge and curiosity about light and visibility, setting the stage for investigation.
Examples
- Students recall that it is hard or impossible to see in the dark.
- Students recognize that a flashlight or light source helps them see objects.
- Students express curiosity about why light is needed to see.
Explore
Teacher Activity
Provide students with flashlights and various objects. Guide them to observe objects in a darkened area first without light, then with flashlight illumination.
Student Activity
Students observe and describe what they see when objects are in darkness and when illuminated by the flashlight. They ask questions about what they notice.
Explanation
Students gather firsthand evidence that objects are visible only when light shines on them or they produce light themselves.
Examples
- Objects are not visible in darkness.
- Objects become visible when illuminated by the flashlight.
- Students note differences in visibility with and without light.
Explain
Teacher Activity
Lead a discussion to help students articulate that objects can be seen only when illuminated. Use examples from their observations and introduce key vocabulary.
Student Activity
Students share their observations and explanations about how light affects visibility. They use new vocabulary to describe their ideas.
Explanation
This phase helps students connect their observations to the scientific concept that illumination is necessary for seeing objects.
Examples
- Students explain that light must shine on objects for them to be seen.
- Students understand that in darkness, objects cannot be seen.
- Students use terms like illuminate and light source correctly.
Elaborate
Teacher Activity
Introduce different materials (transparent, translucent, opaque) and have students test how light passes through or is blocked by them using flashlights.
Student Activity
Students test and observe how light interacts with different materials and record their findings.
Explanation
Students deepen their understanding of how light behaves with various materials and how this affects visibility and shadows.
Examples
- Light passes through transparent materials clearly.
- Light is partially blocked or scattered by translucent materials.
- Opaque materials block light and create shadows.
Evaluate
Teacher Activity
Ask students to explain, using their observations and evidence, why objects can be seen only when illuminated. Have them share their explanations orally or in drawings.
Student Activity
Students construct evidence-based explanations and share them with peers or the teacher.
Explanation
This phase assesses students' understanding and ability to use evidence to explain the concept of illumination and visibility.
Examples
- Students provide explanations supported by their observations.
- Students use evidence such as seeing objects appear and disappear with light.
- Students communicate their understanding clearly.
Classroom Activity
Students observe and describe what they see when objects are in darkness and when illuminated by the flashlight. They ask questions about what they notice.
Guided Practice
Guided Practice 1
Prompt
What do you need to see an object?
Teacher Answer Guide
You need light to see an object because light helps your eyes see it.
Guided Practice 2
Prompt
If you turn off the flashlight in a dark room, what happens to the objects you were looking at?
Teacher Answer Guide
The objects become hard or impossible to see because there is no light illuminating them.
Guided Practice 3
Prompt
How can you test if an object gives off its own light or needs light to be seen?
Teacher Answer Guide
You can put the object in a dark place and see if you can still see it. If you can, it gives off its own light; if not, it needs light to be seen.
Guided Practice 4
Prompt
Why does a shadow form when you put your hand between a flashlight and a wall?
Teacher Answer Guide
Because your hand blocks the light from reaching the wall, creating a dark area called a shadow where the light cannot pass.
Guided Practice 5
Prompt
Explain how different materials (transparent, translucent, opaque) affect whether you can see an object behind them when light shines on them.
Teacher Answer Guide
Transparent materials let light pass through clearly, so you can see objects behind them. Translucent materials let some light through but blur the objects. Opaque materials block all light, so you cannot see objects behind them.
Independent Practice
- Foundational: What do you need to see an object?
- Developing: If you turn off the flashlight in a dark room, what happens to the objects you were looking at?
- Application: How can you test if an object gives off its own light or needs light to be seen?
- Analysis: Why does a shadow form when you put your hand between a flashlight and a wall?
- Challenge: Explain how different materials (transparent, translucent, opaque) affect whether you can see an object behind them when light shines on them.
Independent Practice Teacher Answer Key
- 1. You need light to see an object because light helps your eyes see it.
- 2. The objects become hard or impossible to see because there is no light illuminating them.
- 3. You can put the object in a dark place and see if you can still see it. If you can, it gives off its own light; if not, it needs light to be seen.
- 4. Because your hand blocks the light from reaching the wall, creating a dark area called a shadow where the light cannot pass.
- 5. Transparent materials let light pass through clearly, so you can see objects behind them. Translucent materials let some light through but blur the objects. Opaque materials block all light, so you cannot see objects behind them.
Guiding Questions
- What do you notice when there is no light?
- How does light help us see objects?
- What happens when light is blocked?
- Can objects be seen without light?
- What materials let light pass through?
Common Misconceptions
- Objects can be seen in complete darkness without any light.
- Light is not necessary to see objects.
- All objects produce their own light.
- Shadows are caused by darkness, not by blocking light.
Differentiation
Support and Intervention
Provide visual aids and hands-on materials to support understanding. Use simple language and repeat key vocabulary. Allow students to work in pairs for support during investigations.
English-Language Learner Support
Use pictures and gestures to explain vocabulary like 'illuminate' and 'shadow'. Provide sentence frames for students to describe observations. Use bilingual resources if available.
Advanced and Extension
Encourage students to design their own simple experiments with different light sources. Have students explain their observations using scientific vocabulary. Challenge students to compare how different materials affect light transmission.
Assessment
- Observe students during investigations to see if they can use flashlights safely and make accurate observations.
- Listen to students’ explanations to check understanding of illumination and visibility.
- Review students’ recorded observations for completeness and accuracy.
- Draw a picture showing what happens when you shine a flashlight on an object in a dark room.
- Write one sentence explaining why you can see objects only when there is light.
- Have students write a short explanation using evidence from their observations about why objects can be seen only when illuminated.
- Conduct a quiz with questions about light sources, shadows, and visibility.
Answer Guide
- What do you need to see an object?
Answer: You need light to see an object because light helps your eyes see it. - If you turn off the flashlight in a dark room, what happens to the objects you were looking at?
Answer: The objects become hard or impossible to see because there is no light illuminating them. - How can you test if an object gives off its own light or needs light to be seen?
Answer: You can put the object in a dark place and see if you can still see it. If you can, it gives off its own light; if not, it needs light to be seen. - Why does a shadow form when you put your hand between a flashlight and a wall?
Answer: Because your hand blocks the light from reaching the wall, creating a dark area called a shadow where the light cannot pass. - Explain how different materials (transparent, translucent, opaque) affect whether you can see an object behind them when light shines on them.
Answer: Transparent materials let light pass through clearly, so you can see objects behind them. Translucent materials let some light through but blur the objects. Opaque materials block all light, so you cannot see objects behind them.
Real-Life Application
Encourage students to observe objects at home in different lighting conditions, such as in a dark room, near a window during the day, or with a lamp at night. Ask them to share their observations with family members and bring their findings to class.
Homework or Home Connection
- Encourage students to observe objects at home in different lighting conditions, such as in a dark room, near a window during the day, or with a lamp at night. Ask them to share their observations with family members and bring their findings to class.
Lesson Summary
Students learned that objects can be seen only when they are illuminated by a light source or when they produce their own light. Through observations and investigations using flashlights and various materials, they gathered evidence that light is necessary for visibility. They explored how different materials affect light transmission and how shadows form when light is blocked. This understanding helps explain everyday experiences with light and seeing objects.
Teacher Notes
Use the exact standards alignment and retrieved-source provenance stored with this enrichment.