Energy, Waves, and Living Systems: Grade 4 Science

Your child rolls balls into cups, marbles into dominoes, and rolls objects down ramps, always asking the same question: when something hits something else, where did the energy go? This is the foundation for the entire year — every later unit about waves, light, and sound reuses this "energy goes somewhere, it doesn't vanish" habit.

1. Energy transfer in a collision between a moving object and a struck object+

   Students identify that a moving object's energy causes a change (motion, sound, or shape) in an object it hits.

2. Direction of contact in a simple collision between a moving object and a still object+

   Students match a described collision (ball into cups, marble into domino) to a picture showing the correct direction of the hit.

3. Energy transfer pathway from moving ball to struck block, including sound and motion outputs+

   Students explain, using a labeled diagram, where a rolling ball's energy went after it strikes a stationary block.

4. Relationship between release height, speed, and distance traveled by a struck object+

   Students predict how increasing ramp height will change the distance a struck object travels, based on the pattern in their own data.

5. Complete electric circuit as a closed loop enabling energy transfer+

   Students construct a complete simple circuit that lights a bulb, given a battery, wire, and bulb.

6. Direction of energy conversion between motion and electricity in everyday devices+

   Students classify given devices (flashlight, wind turbine model, hand-crank generator) by whether they convert motion into electrical energy or electrical energy into motion.

7. Fair-test design isolating ramp height as the single changed variable+

   Students design a fair test that changes only ramp height while holding ball mass, ramp surface, and release method constant.

8. Pattern and exception in ramp-height-versus-distance data across multiple trials+

   Students compare two ramp-height trials with contrasting results and identify which trial's result breaks an otherwise consistent pattern.

9. Energy transfer from a raised object's position to motion on release, applied to an untaught track shape+

   Students explain, using energy-transfer vocabulary, why a toy car placed at the top of an unfamiliar curved track (not a straight ramp) will move once released, without being told which force applies.

10. Relationship between object speed and size of change caused in a collision, argued from original data+

    Students write a claim-evidence-reasoning paragraph using their own ramp-height data to argue whether a faster-moving object always causes a bigger change when it hits something.

Using a rope, a spring, and water, your child learns that a wave moves a repeating pattern of energy from one place to another without the rope, spring, or water itself traveling along with it. This is the single hardest idea to "see," because everything in Unit 1 involved an object physically moving to its target — this unit is about energy moving while the material stays roughly in place.

1. The physical features of a transverse wave (crest, trough, amplitude, wavelength)+

   Students identify the crest, trough, amplitude, and wavelength on a labeled diagram of a wave.

2. The distinction between the motion of the medium and the motion of the wave pattern+

   Students describe, using a rope or spring they have shaken themselves, what part of the medium stayed near its resting spot and what part of the pattern traveled.

3. The relationship between shake speed and the resulting wavelength and amplitude of a rope wave+

   Given two shake-speed trials on the same rope, students compare the wavelength and amplitude produced by each trial.

4. The cause-and-effect relationship between wave energy passing through water and the limited motion of a floating object+

   Students explain why a floating cork moves up and down but does not travel across the water as a water wave passes beneath it.

5. The categorical difference between wave-pattern transfer and object transfer, applied to new examples+

   Students classify a set of described phenomena as examples of a wave transferring a pattern versus an object transferring itself.

6. Application of the wave-pattern-versus-matter-transfer model to an unfamiliar real-world context (a wave pool)+

   Students predict what a cork floating in a wave pool at an amusement park would do as waves pass, and justify the prediction using the rope/water wave model from this unit.

7. Measurement and recording of amplitude and wavelength using a physical rope-wave setup+

   Students measure amplitude and wavelength of a rope wave at two shake speeds and record both in a labeled sketch.

8. A claim-evidence-reasoning explanation of matter-versus-pattern motion in a wave, using the summative rope investigation as evidence+

   Students write a claim-evidence-reasoning explanation stating what stayed still and what moved as a wave passed through a rope.

Your child learns that we see an object because light bounces off it and travels into our eye — not the other way around. Before anything else, this unit tackles head-on the very common belief that light shoots out FROM the eye. After that's settled, it moves through reflection, absorption, and see-through versus not-see-through materials, ending with mirror puzzles where your child redirects a flashlight beam around an obstacle.

1. The light-to-eye pathway for vision+

   State that an object becomes visible when light reflects off it and travels to an eye.

2. The opaque/translucent/transparent classification of materials by light transmission+

   Sort a set of everyday materials (glass, wax paper, cardboard, foil) into opaque, translucent, and transparent using how much light passes through each.

3. The ray-diagram representation of reflection off a plane surface+

   Draw a labeled diagram showing a light path from a source, reflecting off a mirror, to an eye, given the position of source, mirror, and eye.

4. The rule that light travels in straight lines and reflects at the surface it strikes+

   Predict where a flashlight beam will land after reflecting off a mirror placed at a new angle not previously tested, then explain using the straight-line rule.

5. The relationship between a material's light transmission and the shadow or visibility it produces+

   Explain why a translucent material like wax paper still allows a fuzzy shadow to form, connecting partial blocking to the object's visibility.

6. The distinction between organized (specular) and scattered (diffuse) reflection versus the presence/absence of reflection+

   Compare two objects, one shiny and one dull, to explain why both reflect light to the eye even though only one looks 'shiny'.

7. A multi-mirror light path that redirects a beam around an obstruction+

   Plan and test a two-mirror arrangement that redirects a flashlight beam around an obstacle to hit a target, recording the working arrangement.

8. Application of the reflection and straight-line-travel rules to an untaught optical device or scenario+

   Given a completely new scenario (a submerged object viewed from above an aquarium, or a periscope in a submarine), explain what happens to the light path using reflection and straight-line travel, with no prior classroom example of that exact device.

9. A claim-evidence-reasoning explanation of a mirror-redirected light path+

   Write a claim-evidence-reasoning paragraph explaining how redirecting a beam with mirrors let the light reach a target it could not reach directly, citing the recorded light path as evidence.

Your child learns that sound happens when something vibrates, and that the sound then travels as a wave to a listener's ear — needing some material (air, water, a solid) to travel through, unlike light. They compare pitch and loudness as two separate things, and finish by building a string-and-cup telephone and testing what happens when they change the string's tightness.

1. The cause-effect relationship between vibration and sound production+

   Students explain that sound is produced when an object vibrates, using a tuning fork or rubber band as evidence.

2. The vibrating part responsible for a given everyday sound+

   Students classify a set of everyday sound sources (voice, drum, radio speaker, wind chime) by identifying the vibrating part in each.

3. The requirement that sound needs a medium to travel through+

   Students predict whether sound will travel through a foam block, a material never tested or shown in class, based on the medium model built with air, string, and solids.

4. The relationship between vibration rate (frequency) and pitch+

   Students compare the vibration rate of two rulers of different lengths and relate rate to the pitch heard.

5. The vocabulary terms amplitude and frequency and their sound effects+

   Students recall the term for how big a vibration is (amplitude) and the term for how fast it repeats (frequency), matching each to its effect on sound (loudness or pitch).

6. The shared and differing structure of sound-to-ear and light-to-eye energy pathways+

   Students compare the sound-to-ear pathway with the light-to-eye pathway studied in Unit 3, identifying what is the same (wave-carried energy, a receiver) and what is different (medium requirement).

7. How a sound wave's pattern can carry a coded signal+

   Students explain why a coded pattern of long and short sounds (e.g., a simple tapped code) can carry a message, connecting this to the idea that a wave carries a pattern, not matter.

8. The procedure for constructing and fair-testing a string-and-cup telephone+

   Students execute the constructed procedure for building and testing a string-and-cup telephone, following the modeled steps for construction and a fair test of string tightness.

9. The effect of string tightness on transmitted sound, explained through vibration and medium+

   Students generate a claim-evidence-reasoning paragraph that judges whether tightening the string changed what was heard and explains why using the vibration-medium model.

Your child takes the two specific mechanisms they already know — eyes detect reflected light, ears detect vibration — and generalizes them into one idea: a sense organ detects a kind of energy from outside and turns it into a signal the brain uses to produce a behavior. They map this pathway (stimulus, organ, signal, brain, response) across all five senses, then compare human senses to specialized animal ones like eagle eyesight, bat hearing, and shark electroreception.

1. The sense organ as an energy-to-signal converter+

   Students state that a sense organ is a body part that detects a specific kind of outside energy and turns it into a signal.

2. The stimulus-organ-signal-brain-response pathway+

   Given a labeled diagram, students sequence the pathway from stimulus to sense organ to signal to brain to response.

3. Behavior as a response to a sensed stimulus+

   Students classify a described animal behavior as a response to a specific sensed stimulus (light, sound, touch, chemical, or other).

4. Comparison of an animal sense organ to the matching human sense organ+

   Students compare a named animal's specialized sense organ to the matching human sense organ, explaining what each detects and how well.

5. Fit between a sense organ's structure and its environment's available energy+

   Students infer why a specific sense organ's structure fits the environment an animal lives in, using evidence about the environment's available energy.

6. A CER argument for structure-environment fit in an animal's sense organ+

   Students construct a claim-evidence-reasoning paragraph arguing why a chosen animal's sense organ fits its environment, using evidence drawn from Units 3-4 mechanisms.

7. Prediction of sense mismatch for an unfamiliar animal+

   Given an animal never discussed in class, students predict which human sense is least similar to that animal's most important sense, and justify the choice with one piece of evidence about the animal's environment.

8. Definitions of stimulus, signal, and response+

   Students recall the definitions of stimulus, signal, and response using the terms as introduced on Day 2.

Your child widens the "structure fits function" idea from sense organs to every kind of survival structure — cactus spines, thorns, internal organs, camouflage, all of it. They sort structures by purpose, compare how two unrelated organisms solve the same survival problem in different ways, and finish by comparing two organisms' structures in writing.

1. External vs internal structures on a plant diagram+

   Label a diagram of a cactus, naming which parts are external structures and which are internal.

2. Function of a specific named external structure+

   State the survival function of a named external structure, such as a thorn or spine.

3. Function of a specific named internal organ exactly as modeled (e.g., stomach breaks down food; root absorbs water)+

   State the survival function of a named internal organ, using the same organ and wording shown in a worked example.

4. Structure-function relationship in an internal organ (e.g., stomach, heart, root)+

   Explain how a named internal organ supports survival, connecting its shape to its job.

5. Structure-function comparison across two organisms solving one shared survival problem+

   Compare how two organisms in different environments solve the same survival problem with differently shaped structures.

6. Categories of structure purpose: survival, growth, protection, reproduction+

   Classify a set of structures as supporting survival, growth, protection, or reproduction.

7. Inferred structure-function match for an unfamiliar organism-habitat pair+

   Given a new organism and habitat never discussed in class, infer which structure most likely helps it survive there and why.

8. CER comparison of two survival structures across two organisms+

   Write a claim-evidence-reasoning comparison of two organisms' survival structures, weighing each structure's evidence.

9. Validity of a relatedness claim based on shared structure shape+

   Judge whether a claim that two structurally similar organisms must be closely related is supported by the structure-function evidence given.

Your child studies how weathering breaks rock apart and erosion carries the pieces away, using rock layers and real landforms as evidence of slow change over time. They build a mini streambed (a stream table), test how water flow speed changes erosion, and read maps and photos of real rivers, canyons, and dunes as evidence of a process, not a snapshot.

1. The distinction between weathering and erosion+

   State that weathering breaks rock into smaller pieces and erosion moves those pieces to a new location.

2. The weathering/erosion location test applied to a single labeled photo+

   Match a given photo of a weathering or erosion example to its correct vocabulary label, using the same location test shown in the worked example.

3. The bottom-equals-oldest stacking rule applied to a single simple diagram+

   Order three rock layers from oldest to newest using a diagram that matches the worked bottom-to-top example exactly.

4. Weathering, erosion, and deposition as distinct but connected processes+

   Classify photographed examples of land change as weathering, erosion, or deposition.

5. The mismatch between the speed of surface processes and the length of human observation+

   Explain why a landscape can look unchanged from day to day even though weathering and erosion are constantly acting on it.

6. Rock layers as a time-ordered record of deposition+

   Infer the order in which rock layers formed, using the principle that layers form from bottom to top.

7. Flow rate as the manipulated variable in a stream-table erosion test+

   Run a fair test comparing how two different water flow rates affect the amount and pattern of erosion in a stream table.

8. The cause-and-effect relationship between flow rate and erosion pattern+

   Explain the relationship between water flow rate and the amount and pattern of erosion, citing the class's own stream-table data.

9. Patterns of Earth's surface features shown on maps+

   Interpret a topographic or satellite map to identify patterns in landforms such as river deltas, valleys, or dunes.

10. The relationship between flow rate and erosion, supported by two data sources+

    Construct a claim-evidence-reasoning paragraph that weighs stream-table data against a labeled before/after diagram to explain how flow rate affects erosion.

11. Landform origin inferred from visual evidence of formation rate+

    Predict which of two unfamiliar landforms (never discussed in class) formed mainly from a fast dramatic event versus a slow steady process, using only a photo and no labels.

The last unit asks your child to put three tools from earlier in the year to work together: energy transfer, structure-function, and Earth's surface processes. They sort resources into renewable and nonrenewable, trace coal or wind power back to a light bulb, look at mining or damming as a change to the land, and evaluate real solutions like dams and water filters as structures with both a job and a downside. It ends with a written recommendation comparing two competing proposals for a community resource.

1. Renewable versus nonrenewable natural resources+

   Sort a set of resource cards (coal, wind, water, oil, trees, sunlight) into renewable and nonrenewable groups and state the rule used.

2. The energy-transfer chain from a fuel source to a usable output+

   Explain, using Unit 1 energy-transfer vocabulary, how burning coal transfers energy to a light bulb.

3. Trade-offs between two energy sources on shared criteria+

   Compare a coal-fired power plant and a wind farm on the same three criteria: cost, reliability, and environmental effect.

4. The effect of resource extraction on surface processes+

   Identify which step of resource extraction (mining, drilling, damming, or clear-cutting) most changes the land surface, using Unit 7 erosion vocabulary.

5. Structure-function reasoning applied to a human-built filtration device+

   Explain how the shape of a water filter's layers lets it remove particles, using the structure-function lens from Unit 6.

6. Design modifications that reduce environmental impact while preserving intended function+

   Generate two possible design changes to a dam that would reduce its effect on fish while keeping its energy function.

7. Competing resource proposals weighed on benefit versus environmental cost+

   Evaluate two competing proposals for a town's water source by weighing benefit evidence against environmental-cost evidence for each.

8. A resource decision in a context not used during instruction+

   Recommend, in a claim-evidence-reasoning response, which of two unfamiliar community resource proposals (e.g., a new fishing regulation vs. a new quarry) a town should choose, using no proposal type discussed in class.

9. Definitions of renewable and nonrenewable resources+

   Recall the definition of renewable and nonrenewable resources from memory.

10. The benefit/cost T-chart format for analyzing a resource use+

    Execute a two-column T-chart listing one benefit and one environmental cost for a given resource use, following the modeled format.