Week 2: Energy Changes Form (Energy Cannot Be Created or Destroyed)

Unit 1: The Planetary Engine

This Week's Big Question

If energy does not disappear, where does it go when something changes?

This week children watch energy change shape. A rubber band snaps back, a flashlight glows, hands get warm, and a food chain gets smaller as energy spreads out along the way.

Kid Version in One Sentence

Energy does not disappear; it changes into motion, light, sound, heat, or stored energy.

You'll Discover

• how energy can change form without vanishing
• why many systems give off heat while doing another job
• why food chains get smaller as energy moves upward

Grown-up Note

• Keep the main path concrete: warm hands, stretched rubber band, flashlight, and bean piles.
• Save the formal law names for the Older Learner box.
• Sessions are designed for about 20 minutes. Use the Short Path when you only have 15-20 minutes. Extra Challenge options can stretch closer to 25-30 minutes.

Common Kid Misconceptions

• Misconception: "Lost energy is gone forever." Response: "Usually it spread out as heat, so it is harder to use, but it was not destroyed."
• Misconception: "Heat is a different thing from energy." Response: "Heat is one way energy shows up."
• Misconception: "Big animals at the top of a food chain get the most energy." Response: "They often need the most energy, but less usable energy reaches them."

Week at a Glance

Session length	About 20 minutes
Prep time	About 10 minutes
Materials	Rubber band, flashlight or phone light, dry beans or counters, paper, pencil, Systems Log
Safety	Do not shine bright lights into eyes; do not snap a rubber band at people
Core vocabulary	energy, heat, stored energy, food chain, waste heat
Older learner words	First Law of Thermodynamics, Second Law of Thermodynamics, entropy, trophic efficiency

Core Vocabulary

Word	Kid-friendly meaning
energy	The power that makes changes happen
heat	Energy that spreads out and makes something warmer
stored energy	Energy kept for later, like in food or a stretched rubber band
food chain	A path showing who gets energy by eating whom
waste heat	Heat made while a system is doing some other job

Short Path for Younger Learners

• Do one quick energy-change demo: stretch a rubber band, rub hands, or use a flashlight.
• Build one simple bean food chain with shrinking piles: plant, bug, frog, owl.
• Draw the food chain with arrows and smaller piles each step.
• End with the Systems Log and one sentence: "The energy changed into..."

Success looks like: the child can explain that energy changes form and often spreads out as heat.

Extra Challenge for Older Learners

• Compare several devices and identify their main job and their waste heat.
• Use approximate 10% transfer language for a simple food chain.
• Discuss why top predators are fewer and need larger support systems.

Read-Aloud Opening

"Today we are following energy after it changes shape. When you move, light a flashlight, or stretch a rubber band, energy does not disappear. It changes into other forms. Some stays useful for the next step, and some spreads out as heat."

Guided Session 1: Watch Energy Change

Time: 20-25 minutes

Materials: rubber band, flashlight or phone light, hands, paper

Safety note: Stretch the rubber band gently and keep it pointed away from faces.

Setup: Place the flashlight and rubber band on the table before the child arrives.

Activity steps:

1. Stretch the rubber band and feel it right away.
2. Rub hands together quickly and feel the warmth.
3. Turn on the flashlight for a minute and notice light plus warmth.
4. Ask, "Where did the energy go each time?"

What to ask:

• What changed in each example?
• Which kind of energy could you notice with your eyes?
• Which kind could you notice with your skin?
• Did any energy vanish, or did it just change form?

Draw It: Make a before-and-after sketch for one example, such as battery -> light + warmth.

Talk About It:

• Why do machines and bodies often get warm while doing something else?
• Can you think of a toy or tool that makes both motion and heat?
• Why might a system never be perfect at only one job?

What success looks like: The child can name at least two forms energy changed into.

Guided Session 2: Why Food Chains Get Smaller

Time: 20-25 minutes

Materials: 25-40 dry beans or counters, paper, pencil

Setup: Put a starting pile of beans on the table and label it "plant."

Activity steps:

1. Say the whole pile stands for energy stored in plants.
2. Move a smaller pile to a bug or rabbit.
3. Move a smaller pile again to a frog or fox.
4. Move a smaller pile again to an owl or hawk.
5. Look at how the piles shrink.

For the younger path, keep the numbers whole and visible. You can use 20 beans and move about 10, then 5, then 2, then 1. The exact number is less important than the pattern.

What to ask:

• Why do the piles get smaller?
• Where did the rest of the energy go?
• Why are there usually more plants than top predators?

Draw It: Draw a food chain with shrinking bean piles under each living thing.

Talk About It:

• What would happen if we tried to support too many top predators?
• Why do animals need lots of energy just to stay alive?
• Where else do you see a system getting smaller at each step?

What success looks like: The child can explain that each step uses energy and leaves less stored energy for the next step.

Systems Log

Use this simple entry:

What I noticed:
What moved:
Where it came from:
Where it went:
My drawing:
One question I still have:

Helpful prompts for this week:

• What I noticed: "The flashlight made..."
• What moved: "Energy moved from..."
• Where it went: "Some energy became..."
• My drawing: a shrinking food chain

Systems Thinking Move

An environmental system is made of connected parts. Energy moves through the system, and some of it spreads out as heat at each step.

• What parts are in this system?
• What moves through the system?
• What causes what?
• What happens next?

Simple examples:

• sun -> plant -> insect -> bird
• battery -> light + warmth

Environmental Data Check

Use simple counts, bean piles, or food-chain drawings to ask:

• What does this model measure?
• What pattern do I notice as the piles get smaller?
• What might this model not show about a real ecosystem?
• What should I check before using a number as evidence?

Engineer Corner

Older learners and facilitators can add the formal language here.

• The First Law of Thermodynamics says energy cannot be created or destroyed.
• The Second Law says every energy change spreads some energy into less useful forms, usually heat.
• The technical word entropy belongs here, not in the main kid path.
• Food webs often use a rough 10% transfer rule, but real ecosystems vary.

The core systems idea stays simple: energy is conserved, but it does not stay equally useful at every step.