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. Moving things change other things+

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

2. Which way the hit goes+

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

3. Where rolling energy goes+

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

4. Ramp height and distance+

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

5. Making a circuit light up+

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

6. Motion and electricity in 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. Planning a fair ramp test+

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

8. Finding the odd ramp result+

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

9. Energy on a curvy track+

   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. Faster speed, bigger change+

    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. Parts of a wave+

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

2. What moves in a wave+

   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. Shake speed and wave size+

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

4. Why a cork bobs+

   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. Sorting waves and moving objects+

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

6. Corks in 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. Measuring a rope wave+

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

8. Writing about a rope wave+

   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. How we see things+

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

2. Sorting materials by light+

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

3. Drawing light bouncing off mirrors+

   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. Predicting where light bounces+

   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. Shadows and wax paper+

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

6. Shiny and dull reflections+

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

7. Steering light with two mirrors+

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

8. Using light rules somewhere new+

   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. Explaining light with mirrors+

   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. Vibrations make sound+

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

2. Finding the vibrating part+

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

3. Sound needs something to travel+

   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. Fast vibrations and pitch+

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

5. Amplitude and frequency+

   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. Comparing sound and light paths+

   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. Sending messages with sound patterns+

   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. Build and test a 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. Tight strings and sound+

   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. What a sense organ does+

   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. From stimulus to response+

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

3. Animals responding to stimuli+

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

4. Comparing animal and human senses+

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

5. Why senses fit environments+

   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. Writing an argument about senses+

   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. Predicting senses of new animals+

   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. Stimulus signal and response words+

   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. Outside and inside plant parts+

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

2. What outside parts do+

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

3. Jobs of inside organs+

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

4. How shape helps organs work+

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

5. Two living things one problem+

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

6. Four purposes of structures+

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

7. Guess how it survives there+

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

8. Compare two survival features+

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

9. Do similar shapes mean relatives+

   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. Weathering versus erosion+

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

2. Labeling weathering and erosion+

   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. Ordering three rock layers+

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

4. Weathering, erosion, or deposition+

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

5. Why land looks unchanged+

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

6. What rock layers tell us+

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

7. Fair test with water flow+

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

8. How water flow changes erosion+

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

9. Patterns in landforms on maps+

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

10. Explaining erosion with two clues+

    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. Guess how a landform formed+

    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. Sorting renewable and nonrenewable resources+

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

2. From coal to light+

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

3. Comparing coal and wind power+

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

4. How getting resources changes land+

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

5. How water filter shapes work+

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

6. Redesigning a dam for fish+

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

7. Weighing two water source plans+

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

8. Choosing between two town plans+

   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. What renewable and nonrenewable mean+

   Recall the definition of renewable and nonrenewable resources from memory.

10. Benefits and costs chart+

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