- Read Yuki's test: aluminum foil in front of a lamp blocked light; a mirror bounced light. What is the evidence that shiny materials can reflect light?
Answer: The mirror sent a bright beam back, so the shiny surface reflected light instead of letting it through.
This question tests understanding of 1-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - using evidence to explain how materials change light and visibility. Materials can change light in different ways: shiny smooth surfaces like mirrors and polished metal reflect light back as a beam, while dull or crinkled surfaces may block or scatter light without creating a directed reflection. Yuki observed aluminum foil and a mirror with lamp light. Evidence collected: aluminum foil blocked light (no light passed through), mirror bounced light back as a bright beam, and both materials were shiny but behaved differently due to surface smoothness. This shows that shiny smooth surfaces reflect light in a directed way, while crinkled shiny surfaces may just block light. The correct answer says "The mirror sent a bright beam back, so the shiny surface reflected light instead of letting it through" which correctly connects material property → light change → visibility effect using evidence. The answer identifies the shiny surface as the key property for reflection, explains it sent light back as a beam rather than letting it through - showing understanding of how surface properties determine light behavior. Incorrect answers like "The foil was crinkly, so it made the lamp turn off and on" are wrong because they invent impossible effects - materials can't turn lamps on and off, they can only change how light travels. Students might choose this if they don't understand how materials interact with light. Help students compare surface effects: shine light on smooth foil vs crinkled foil vs mirror to see how surface texture affects reflection quality. Use investigations: test various shiny materials (spoon, CD, polished metal) to find the pattern that smooth shiny surfaces create clear reflections. Emphasize evidence: the bright reflected beam proves light is bouncing back, not passing through or being absorbed.
- Carlos moved wax paper closer to the wall and farther away. Closer looked blurrier; farther looked a little clearer. What evidence shows wax paper changes light?
Answer: When wax paper was closer, light spread out more, so shapes beyond looked blurrier.
This question tests 1st-PS4-3: investigating how distance affects light scattering by materials. When scattering materials are closer to a surface, the scattered light has less distance to spread, appearing blurrier. Carlos moved wax paper and observed: closer to the wall looked blurrier, farther away looked slightly clearer, showing how distance affects the scattering pattern. This demonstrates that wax paper scatters light, and the scattered light spreads more with distance, affecting clarity. The correct answer A states "When wax paper was closer, light spread out more, so shapes beyond looked blurrier" which correctly connects position → scattering effect → visibility change. Answer C incorrectly claims light stayed bright and straight despite the observed blurriness. To teach this, demonstrate moving wax paper closer and farther from a wall while shining light through it. Help students observe how the scattered light pattern changes with distance. This shows that materials don't just change light, but the effect can vary with position.
- Read about Sofia. The mirror bounced flashlight light back in a bright beam. She could not see through the mirror. What evidence shows the mirror reflected light?
Answer: The mirror reflected light back, so she saw a bright beam and could not see beyond it.
This question tests understanding of 1-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - using evidence to explain how materials change light and visibility. Materials can change light in different ways: mirrors reflect light back completely (we cannot see beyond, only reflections). Sofia observed mirror with flashlight: Evidence collected: [Observation 1: flashlight beam bounced back from mirror], [Observation 2: saw bright reflected beam], [Observation 3: could not see through mirror at all]. For example, the mirror's reflective surface sent all the flashlight light back toward Sofia instead of letting any pass through. This shows the material's reflective property changed the light by reflecting it which prevented any visibility beyond. The correct answer A says "The mirror reflected light back, so she saw a bright beam and could not see beyond it" which correctly connects material property → light change → visibility effect using evidence. The answer cites the observation that mirror reflected light back, explains the material's reflective property caused complete light reflection, and this made it impossible to see beyond. This is a complete evidence-based explanation. Incorrect reasoning like "She could not see beyond the mirror, so the mirror must have made the flashlight turn off" (B) is wrong because it misunderstands the cause - Sofia saw a bright reflected beam, so the flashlight was clearly still on; the mirror reflected light rather than turning it off. Students might choose this if they think "no view through = no light" without considering reflection. Help students see the full causal chain with sentence frames: "The material is [reflective] → so light [bounces back] → which makes things beyond [impossible to see]." Do demonstrations showing material → light change: shine flashlight at mirror at angle, trace path of reflected beam with hand. Compare to shining through glass - light continues forward vs bouncing back.
- Read Sofia's test: flashlight on mirror bounced back; wall spread light. What is the evidence that a mirror changes light?
Answer: Light hit the mirror and bounced back bright, so she saw a reflection, not through it.
This question aligns with the skill 1-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - using evidence to explain how materials change light and visibility. Materials can change light in different ways: clear materials let light pass through without changing it much so you can see clearly beyond, colored materials change the light's color making objects beyond look that color, frosted or bumpy materials scatter light so objects beyond look blurry, thick materials block light so you cannot see beyond, and mirrors reflect light back so you see a reflection but not beyond. The way a material changes light determines what you can see through or beyond it. Sofia observed a mirror with light; evidence collected: flashlight on mirror bounced back bright, wall spread light, and she saw a reflection not through it. For example, light hit the mirror and bounced back, showing reflection. This shows the material's shininess changed the light by reflecting it which changed visibility by preventing seeing beyond. The correct answer says 'Light hit the mirror and bounced back bright, so she saw a reflection, not through it' which correctly connects material property → light change → visibility effect using evidence. The answer cites the observation that light bounced back, explains the material's surface caused reflection, and this made things beyond invisible. This is a complete evidence-based explanation. A distractor like 'The mirror let light pass through, so Sofia saw objects behind it clearly' is wrong because it attributes to wrong material property and reverses the actual effect. Students might choose this if they do not understand how material properties affect light or confuse reflection with transmission. Help students see the full causal chain with sentence frames: 'The material is shiny → so light reflects back → which makes you see reflection not beyond.' Do demonstrations showing material → light change: shine light on mirror, watch it bounce back. Then show light change → visibility change: reflected light shows your face, not through. Connect both: material changed light, changed light changed visibility. Use comparisons: same light on mirror vs wall - compare what you see. Emphasize evidence: multiple observations showing same pattern (mirrors always reflect) proves material causes effect. Watch for: students who observe but cannot explain cause, or who only focus on final result (seeing reflection) without connecting to material property and how it changed light.
- Jamal stacked yellow and blue cellophane and shined a flashlight. The light looked green and his paper looked green. How did the material change the light and what he saw?
Answer: The colored sheets made green light, so the paper beyond looked green too.
This question tests 1st-PS4-3: investigating how combining materials affects light and visibility. When different colored materials overlap, they create new colors by filtering light - yellow and blue make green. Jamal observed stacked yellow and blue cellophane with a flashlight and collected evidence: the light looked green after passing through both sheets, his paper beyond looked green, showing the combined materials created green light. This demonstrates how layered colored materials filter white light to create new colors, which then makes objects beyond appear that new color. The correct answer B states "The colored sheets made green light, so the paper beyond looked green too" which correctly connects combined materials → light color change → visibility effect. Answer A reverses causation by claiming the paper turned green first. To teach this, demonstrate color mixing with overlapping colored sheets, showing how white light becomes colored when passing through. Help students trace the sequence: materials filter light → filtered light has new color → objects in colored light look that color.
- Read Carlos's lamp test: wax paper made the wall dim and fuzzy. How did wax paper change what he could see?
Answer: Wax paper spread out some light, so shapes showed but details beyond looked blurry.
This question tests understanding of 1-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - using evidence to explain how materials change light and visibility. Materials can change light in different ways: frosted or bumpy materials scatter light in many directions, making objects beyond look blurry, while clear materials let light pass straight through so you can see details clearly. Carlos observed wax paper with lamp light. Evidence collected: the wall beyond looked dim (less light got through), the wall looked fuzzy (light was scattered), and he could see shapes but not details. This shows the wax paper's translucent, textured property changed the light by scattering it, which changed visibility by making everything beyond look blurry. The correct answer says "Wax paper spread out some light, so shapes showed but details beyond looked blurry" which correctly connects material property → light change → visibility effect using evidence. The answer explains that wax paper spread (scattered) light, and this scattering made things beyond look blurry while still showing basic shapes - a complete cause-and-effect explanation. Incorrect answers like "Carlos saw fuzzy shapes beyond the wax paper, but the light did not change" are wrong because they describe the observation without explaining the cause - the wax paper did change the light by scattering it, which caused the fuzzy appearance. Students might choose this if they can observe results but don't understand that materials change light to create those results. Help students connect observations to causes with demonstrations: shine a flashlight through wax paper onto a wall, then through clear plastic - compare how the light spot looks (scattered vs focused). Use sentence frames: "The material is translucent/textured → so light scatters → which makes things beyond look fuzzy." Emphasize that the material's properties cause the light change, which causes what we see.
- Read Sofia's test. What evidence proves a mirror reflected light?
Answer: Light hit the mirror and bounced back bright, so she saw a shiny reflection.
This question tests understanding of 1st-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - using evidence to explain how materials change light and visibility. Materials can change light in different ways: clear materials let light pass through, colored materials change light color, frosted materials scatter light, thick materials block light, and mirrors reflect light back so you see reflections but cannot see beyond. Sofia observed a mirror with light and collected evidence: light hit the mirror and bounced back bright, she saw a shiny reflection of herself, and she could not see through to objects beyond the mirror. This shows the mirror's reflective surface property caused light to bounce back, which changed visibility by showing reflections instead of allowing vision through. The correct answer "Light hit the mirror and bounced back bright, so she saw a shiny reflection" correctly connects material property → light change → visibility effect using evidence, explaining that the mirror's reflective property caused light to bounce back, creating the visible reflection. Incorrect answers like "She could not see through the mirror, so the mirror must be clear" fail because they reverse causation or contradict the properties - students might choose this if they confuse material properties or don't understand that reflection prevents seeing through. Help students see the full causal chain with sentence frames: "The material is [reflective/shiny] → so light [bounces back] → which makes you see [reflections, not through]." Do demonstrations comparing mirror vs clear glass, showing how light bounces off mirrors creating reflections while passing through glass allowing vision beyond.
- Maya put a light inside two cups: clear cup showed the bulb; frosted cup showed a fuzzy glow. What is the evidence that frosted plastic affects light?
Answer: Frosted plastic scattered light, so she saw a soft glow but not bulb details.
This question assesses 1st-PS4-3: investigating how material texture affects light transmission. Frosted materials scatter light, creating a diffuse glow rather than clear visibility. Maya observed light bulbs in different cups and collected evidence: the clear cup showed the bulb clearly, the frosted cup showed only a fuzzy glow without bulb details, demonstrating how frosted plastic scattered the light. This shows the frosted plastic's textured surface scattered light in many directions, preventing clear visibility of the source. The correct answer A states "Frosted plastic scattered light, so she saw a soft glow but not bulb details" which correctly connects material texture → light scattering → reduced visibility. Answer B incorrectly claims light stayed the same despite the visible difference. Help students understand scattering by comparing clear and frosted materials side by side. Demonstrate how frosted surfaces break up light beams into many directions, creating a soft glow instead of clear transmission. Use everyday examples like frosted glass windows that provide privacy by scattering light.
- Read Carlos's test. How did wax paper change light and seeing?
Answer: Wax paper scattered light and made it dim, so shapes beyond looked blurry.
This question tests understanding of 1st-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - using evidence to explain how materials change light and visibility. Materials can change light in different ways: clear materials let light pass through without changing it much, colored materials change light color, frosted/bumpy materials scatter light making objects beyond look blurry, thick materials block light, and mirrors reflect light back. Carlos observed wax paper with light and collected evidence: light became dimmer when passing through, shapes beyond looked blurry instead of sharp, and the wall spot was less bright with wax paper than without. This shows the wax paper's translucent/frosted property scattered the light, which changed visibility by making everything beyond appear blurry and dim. The correct answer "Wax paper scattered light and made it dim, so shapes beyond looked blurry" correctly connects material property → light change → visibility effect using evidence, explaining that wax paper's scattering property caused light to dim and scatter, resulting in blurry vision beyond. Incorrect answers like "Wax paper made him see blurry, but the light stayed the same brightness" fail because they only mention one part of the chain (blurry vision) without connecting to how the material changed the light - students might choose this if they focus on the final result without understanding the full cause-effect relationship. Help students see the full causal chain with sentence frames: "The material is [translucent/frosted] → so light [scatters and dims] → which makes things beyond look [blurry]." Do demonstrations comparing clear plastic vs wax paper, measuring brightness on the wall and observing clarity of objects beyond to show both light dimming and vision blurring.
- Emma compared clear plastic and red plastic with a flashlight. How did the clear plastic change what she could see beyond?
Answer: Clear plastic let bright white light pass through, so she saw her hand beyond clearly and not colored.
This question assesses the skill 1-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - using evidence to explain how materials change light and visibility. Materials can change light in different ways: clear materials let light pass through unchanged, allowing clear visibility beyond without color tint, unlike colored materials that filter light. This transparency keeps light bright and white, preserving normal appearance. Emma observed clear plastic letting bright white light through, so her hand beyond looked clear and normal, compared to red plastic tinting it red; evidence collected: light remained white, hand visible clearly, no color change. For example, clear plastic did not alter the light, maintaining clear visibility. The correct answer says 'Clear plastic let bright white light pass through, so she saw her hand beyond clearly and not colored' which correctly connects material property → light change → visibility effect using evidence. The answer cites the observation that hand looked clear, explains transparency caused no change to light, and this allowed normal visibility; this is a complete evidence-based explanation. A distractor like 'Clear plastic changed the light to red, so her hand beyond looked red and dim' is wrong because it attributes wrong light change, reversing the material's actual effect. Students might choose this if they confuse properties of different materials. Help students see the full causal chain with sentence frames: 'The material is clear → so light passes unchanged → which makes things beyond look normal.' Do demonstrations showing material → light change: shine through clear vs. colored, watch differences; then connect to visibility, emphasizing evidence from comparisons.
- Read Jamal's test: one yellow sheet made yellow light; two made darker. What is the evidence that more layers changed the light?
Answer: Two yellow sheets let less light through, so the light beyond looked darker yellow.
This question tests understanding of 1-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - using evidence to explain how materials change light and visibility. Materials can change light in different ways: colored materials filter light to their color, and adding more layers of the same material increases the filtering effect, making the light darker while keeping the same color. Jamal observed one and two yellow sheets with light. Evidence collected: one sheet made yellow light, two sheets made darker yellow light, and objects beyond looked increasingly yellow with more layers. This shows that yellow sheets filter out non-yellow light, and more layers filter more light, making it darker but still yellow. The correct answer says "Two yellow sheets let less light through, so the light beyond looked darker yellow" which correctly connects material property → light change → visibility effect using evidence. The answer explains that more layers let less light through (increased filtering), resulting in darker yellow light - showing understanding of how layering affects light intensity while maintaining color. Incorrect answers like "Objects beyond looked yellow, so the objects made the light turn yellow" are wrong because they reverse causation - the yellow sheets change the light to yellow, which then makes objects look yellow, not the other way around. Students might choose this if they focus on the final observation without understanding the causal sequence. Help students see the pattern with systematic testing: shine light through 1, 2, and 3 layers of the same colored material, observing how light gets progressively darker but stays the same color. Use sentence frames: "More layers of yellow → filter more light → makes darker yellow light → objects look darker yellow." Emphasize the evidence pattern: consistent color change with varying darkness proves the material is filtering light.
- Read about Emma. Clear plastic let bright white light through and she saw clearly. Red plastic made red light and she saw red. What did Emma learn about different materials?
Answer: Clear and red plastic changed light differently, so what she saw beyond looked different.
This question tests understanding of 1-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - using evidence to explain how materials change light and visibility. Materials can change light in different ways: different materials have different effects on light - clear materials don't change color while colored materials do. Emma observed and compared two materials: Evidence collected: [Observation 1: clear plastic kept light white and view clear], [Observation 2: red plastic made light red and view red], [Observation 3: different materials had different effects]. For example, the clear plastic let white light through unchanged while red plastic filtered out other colors leaving only red. This shows that different material properties changed the light differently which changed visibility differently. The correct answer B says "Clear and red plastic changed light differently, so what she saw beyond looked different" which correctly connects material property → light change → visibility effect using evidence. The answer cites the observation that different plastics affected light differently, explains the materials' different properties caused different light changes, and this made views look different. This is a complete evidence-based explanation. Incorrect reasoning like "All materials change light the same way, so everything beyond looks the same" (A) is wrong because it claims the opposite of what Emma observed - she found clear and red plastic had very different effects on light and visibility. Students might choose this if they overgeneralize before testing different materials. Help students see the full causal chain with sentence frames: "Different materials have different properties → so light [changes differently] → which makes things beyond look [different]." Do demonstrations comparing materials: shine same white light through clear, red, blue, and frosted materials - observe different effects. Create data table showing material type → light change → what you see beyond.
- Read Sofia's test: mirror bounced light; wall spread light. What did Sofia learn about shiny materials and light?
Answer: Shiny mirrors reflect light back, so you see reflections and not through the mirror.
This question aligns with the skill 1-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - using evidence to explain how materials change light and visibility. Materials can change light in different ways: clear materials let light pass through without changing it much so you can see clearly beyond, colored materials change the light's color making objects beyond look that color, frosted or bumpy materials scatter light so objects beyond look blurry, thick materials block light so you cannot see beyond, and mirrors reflect light back so you see a reflection but not beyond. The way a material changes light determines what you can see through or beyond it. Sofia observed shiny mirror with light; evidence collected: mirror bounced light back, wall spread light, and saw reflection not through. For example, shiny mirror reflected light back showing reflection. This shows the material's shininess changed the light by reflecting it which changed visibility by showing reflection instead of beyond. The correct answer says 'Shiny mirrors reflect light back, so you see reflections and not through the mirror' which correctly connects material property → light change → visibility effect using evidence. The answer cites the observation that light bounced, explains the shininess caused reflection, and this prevented seeing through. This is a complete evidence-based explanation. A distractor like 'Shiny mirrors let light pass through, so you see behind them clearly' is wrong because it attributes to wrong material property and contradicts the evidence. Students might choose this if they do not understand how material properties affect light or confuse reflection with transmission. Help students see the full causal chain with sentence frames: 'The material is shiny → so light reflects back → which shows reflection not beyond.' Do demonstrations showing material → light change: shine light on shiny mirror, watch it reflect. Then show light change → visibility change: reflection shows image, not through. Connect both: material changed light, changed light changed visibility. Use comparisons: same light on mirror vs wall - compare effects. Emphasize evidence: multiple observations showing same pattern (shiny always reflects) proves material causes effect. Watch for: students who observe but cannot explain cause, or who only focus on final result (seeing reflection) without connecting to material property and how it changed light.
- Read Chen's test: prism made rainbow stripes on paper; no prism made white spot. What evidence shows the prism changed the light?
Answer: The prism made rainbow colors on paper, so it changed the white light into many colors.
This question aligns with the skill 1-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - using evidence to explain how materials change light and visibility. Materials can change light in different ways: clear materials let light pass through without changing it much so you can see clearly beyond, colored materials change the light's color making objects beyond look that color, frosted or bumpy materials scatter light so objects beyond look blurry, thick materials block light so you cannot see beyond, and mirrors reflect light back so you see a reflection but not beyond. The way a material changes light determines what you can see through or beyond it. Chen observed a prism with light; evidence collected: prism made rainbow stripes on paper, no prism made white spot, and colors separated. For example, prism changed white light into rainbow colors on paper. This shows the material's shape changed the light by splitting it which changed visibility by creating colors. The correct answer says 'The prism made rainbow colors on paper, so it changed the white light into many colors' which correctly connects material property → light change → visibility effect using evidence. The answer cites the observation that white turned to rainbow, explains the prism caused splitting, and this made colors visible. This is a complete evidence-based explanation. A distractor like 'Chen saw colors, so the prism must have colored the paper, not the light' is wrong because it attributes to wrong cause and does not connect material to light change. Students might choose this if they do not understand how material properties affect light or reverse causation. Help students see the full causal chain with sentence frames: 'The material is a prism → so light splits into colors → which makes rainbow visible.' Do demonstrations showing material → light change: shine white light through prism, watch rainbow appear. Then show light change → visibility change: split light shows colors on paper. Connect both: material changed light, changed light changed visibility. Use comparisons: same light with vs without prism - compare what you see. Emphasize evidence: multiple observations showing same pattern (prism always splits) proves material causes effect. Watch for: students who observe but cannot explain cause, or who only focus on final result (rainbow) without connecting to material property and how it changed light.
- Read Carlos's test. Which observation proves wax paper dimmed light?
Answer: With wax paper, the wall spot looked dimmer than without wax paper.
This question tests understanding of 1st-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - using evidence to explain how materials change light and visibility. To prove how materials change light, scientists compare observations with and without the material - if the light spot looks different with the material present, this is evidence the material changed the light. Carlos observed wax paper's effect and collected evidence: without wax paper the wall spot was bright, with wax paper the wall spot looked dimmer, and he could also see less clearly through the wax paper. This comparison shows the wax paper scattered and absorbed some light, making it dimmer. The correct answer "With wax paper, the wall spot looked dimmer than without wax paper" correctly identifies the key evidence - the comparison showing light became dimmer proves the wax paper changed the light. Incorrect answers like "The room was quiet, so the light looked fuzzy on the wall" fail because they connect unrelated observations (sound and light) or don't provide comparative evidence - students might choose this if they don't understand that proving change requires comparison or they mix up different senses. Help students understand scientific evidence with sentence frames: "Without material: [observation], With material: [different observation], This proves: [what material did to light]." Practice before/after comparisons with various materials, emphasizing that the difference between observations is the evidence of how the material changed light.
- Read about Carlos. Without wax paper, lamp light was bright on the wall. With wax paper, it was dim and fuzzy. What evidence shows wax paper changes light?
Answer: The wax paper spread and dimmed the light, so the wall picture looked fuzzy beyond it.
This question tests understanding of 1-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - using evidence to explain how materials change light and visibility. Materials can change light in different ways: frosted or bumpy materials scatter light (objects beyond look blurry), while clear materials let light pass through without scattering (we see clearly beyond). Carlos observed wax paper with lamp light: Evidence collected: [Observation 1: without wax paper, light was bright on wall], [Observation 2: with wax paper, light was dim and fuzzy], [Observation 3: the wall looked fuzzy through the wax paper]. For example, the wax paper made bright light become dim and scattered, making the wall picture look fuzzy. This shows the material's translucent property changed the light by scattering it which changed visibility to fuzzy. The correct answer A says "The wax paper spread and dimmed the light, so the wall picture looked fuzzy beyond it" which correctly connects material property → light change → visibility effect using evidence. The answer cites the observation that wax paper spread and dimmed light, explains the material's translucent property caused light to scatter, and this made the wall look fuzzy. This is a complete evidence-based explanation. Incorrect reasoning like "The wall looked fuzzy beyond the wax paper, so the lamp got weaker by itself" (B) is wrong because it attributes the change to the lamp getting weaker rather than the wax paper changing the light - the lamp stayed the same, only adding wax paper changed things. Students might choose this if they do not see the full chain (material → light → visibility) and think something else must have changed. Help students see the full causal chain with sentence frames: "The material is [translucent/frosted] → so light [scatters and dims] → which makes things beyond look [fuzzy]." Do demonstrations showing material → light change: shine bright light through wax paper, watch it become dim and scattered. Use comparisons: same lamp light through clear plastic vs wax paper - compare brightness and clarity of wall beyond each.
- Read Emma's test: clear plastic stayed bright; red plastic turned light red. What evidence shows red plastic changes light?
Answer: Red plastic made white light turn red, so her hand beyond looked red too.
This question tests understanding of 1st-PS4-3: planning and conducting investigations to determine how materials affect light. The concept is that materials can change light in different ways - clear materials let light pass through without changing it much, while colored materials change light color and make objects beyond look that color. Emma observed red plastic with light and collected evidence: the light turned red when passing through red plastic, her hand beyond the plastic looked red, and clear plastic kept light white for comparison. This shows the red plastic's color property changed the white light to red, which made her hand look red. The correct answer C states "Red plastic made white light turn red, so her hand beyond looked red too" which correctly connects material property → light change → visibility effect using evidence. Answer A incorrectly attributes the color change to weight rather than the material's color property. To teach this, use sentence frames like "The material is [red colored] → so light [turns red] → which makes things beyond look [red]." Demonstrate by shining white light through colored plastic and observing how objects in the colored light appear colored.
- Carlos used a lamp: no wax paper was bright; wax paper was dim and fuzzy. Why did wax paper change what he saw?
Answer: Wax paper scattered light, so shapes beyond looked blurry and the wall looked dim.
This question assesses 1st-PS4-3: investigating how materials affect light and visibility. Materials change light differently - wax paper is frosted/bumpy and scatters light, making objects beyond look blurry and dimmer. Carlos observed wax paper with a lamp and collected evidence: without wax paper the wall was bright and clear, with wax paper the wall looked dim and fuzzy, showing the wax paper scattered the light. This demonstrates how the wax paper's translucent, textured property scattered light in many directions, reducing brightness and clarity. The correct answer A states "Wax paper scattered light, so shapes beyond looked blurry and the wall looked dim" which correctly connects material property → light change → visibility effect. Answer B reverses causation by saying the wall looked fuzzy first, then light spread out. Help students see the full causal chain: demonstrate shining light through wax paper and watching it scatter, then show how this scattered light makes things look blurry. Use comparisons between clear plastic and wax paper to highlight the difference.
- Read Sofia's test: flashlight on mirror bounced back; wall did not. What did Sofia learn about how a mirror affects light?
Answer: The mirror reflected light back in a bright beam, so she saw a clear reflection, not through it.
This question tests understanding of 1-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - using evidence to explain how materials change light and visibility. Materials can change light in different ways: mirrors and shiny surfaces reflect light back instead of letting it pass through, while non-shiny surfaces like walls absorb or scatter light without reflecting it back as a beam. Sofia observed a mirror and wall with flashlight. Evidence collected: light on mirror bounced back as a bright beam, light on wall did not bounce back, and she saw a clear reflection in the mirror but could not see through it. This shows the mirror's smooth, shiny property changed the light by reflecting it back, which changed visibility by showing a reflection instead of letting you see beyond. The correct answer says "The mirror reflected light back in a bright beam, so she saw a clear reflection, not through it" which correctly connects material property → light change → visibility effect using evidence. The answer explains that the mirror reflected light back (the cause), creating a bright beam and reflection, and preventing seeing through it - a complete explanation of how the material affects both light and visibility. Incorrect answers like "The mirror let light pass through, so she could see behind it clearly" are wrong because they describe the opposite of what mirrors do - mirrors reflect light, they don't let it pass through. Students might choose this if they confuse mirrors with clear materials like glass windows. Help students understand reflection with hands-on activities: shine flashlights at mirrors at different angles to see the reflected beam, compare to shining at paper or walls. Use comparisons: "Clear glass lets light through → see beyond; Mirror reflects light back → see reflection, not beyond." Emphasize the evidence: the bouncing light beam proves reflection is happening.
- Read Emma's test. How did clear plastic change light and seeing?
Answer: Clear plastic let bright white light pass, so she saw her hand clearly beyond.
This question tests understanding of 1st-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - using evidence to explain how materials change light and visibility. Materials can change light in different ways: clear materials let light pass through without changing it much so you can see clearly beyond, while colored materials change light color, frosted materials scatter light, and opaque materials block light. Emma observed clear plastic with light and collected evidence: bright white light passed through unchanged, she could see her hand clearly beyond the plastic, and the light remained bright white on the wall. This shows the clear plastic's transparent property allowed light to pass through without scattering or color change, maintaining clear visibility. The correct answer "Clear plastic let bright white light pass, so she saw her hand clearly beyond" correctly connects material property → light change → visibility effect using evidence, explaining that the clear material didn't change the light, allowing clear vision. Incorrect answers like "Clear plastic blocked light, so she saw only a dark shadow beyond it" fail because they describe the opposite of what clear materials do - students might choose this if they confuse transparent with opaque materials or don't understand that "clear" means light passes through. Help students see the full causal chain with sentence frames: "The material is [clear/transparent] → so light [passes through unchanged] → which makes things beyond look [clear and normal]." Do demonstrations comparing clear plastic, colored plastic, and cardboard to show how only clear materials maintain both light brightness and clear visibility.
