Conservation of Energy

Active learning makes the abstract concept of energy transformation concrete for students. When they build and observe systems like pendulums and roller coasters, they directly see energy change forms rather than just hearing about it in a lecture. This hands-on engagement builds lasting understanding by connecting prior knowledge to real-world observations.

• 6th Class
• Scientific Inquiry and the Natural World
• 4 activities
• 20 min–45 min

Learning Objectives

1. Analyze the energy transformations occurring in a simple pendulum system, identifying points of maximum potential and kinetic energy.
2. Explain the Law of Conservation of Energy using examples of energy conversion between potential, kinetic, thermal, and sound energy.
3. Predict the sequence of energy transformations in a roller coaster ride, accounting for energy losses due to friction.
4. Diagram the flow of energy through a closed system, illustrating how energy changes form but not quantity.
5. Calculate the change in potential energy of an object based on its mass, height, and gravitational acceleration.

Simulation Game

⏱ 30 min·Pairs

Pairs: Pendulum Energy Tracker

Partners attach a weight to string, swing it from varying heights, and time swings while measuring peak heights. They sketch energy bars showing potential to kinetic shifts at three points per swing. Discuss why swings slow over time.

Prepare & details

Explain the Law of Conservation of Energy.

Facilitation Tip: During the Pendulum Energy Tracker, have students mark the release point, midpoint, and highest point after the swing to clearly compare potential and kinetic energy at each stage.

Setup: Flexible space for group stations

Materials: Role cards with goals/resources, Game currency or tokens, Round tracker

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Simulation Game

⏱ 45 min·Small Groups

Small Groups: Marble Roller Coaster

Groups construct tracks from foam pipes and tape on a ramped board, releasing a marble from heights. They mark potential and kinetic zones, time descents, and note slowdowns. Compare total energy start to end.

Prepare & details

Analyze how energy is conserved in a swinging pendulum.

Facilitation Tip: For the Marble Roller Coaster, ask groups to tape their track to a wall first so they can adjust height and curves without rebuilding each time.

Setup: Flexible space for group stations

Materials: Role cards with goals/resources, Game currency or tokens, Round tracker

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Simulation Game

⏱ 20 min·Whole Class

Whole Class: Bouncing Ball Demo

Drop balls of different materials from set heights; class measures bounce heights and times together using a meter stick and stopwatch. Chart kinetic to potential conversions per bounce. Predict next bounce energy.

Prepare & details

Predict the energy transformations in a roller coaster ride.

Facilitation Tip: During the Bouncing Ball Demo, have students touch the floor where the ball lands to feel any warmth from energy transfer.

Setup: Flexible space for group stations

Materials: Role cards with goals/resources, Game currency or tokens, Round tracker

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Simulation Game

⏱ 25 min·Individual

Individual: Energy Diagram Puzzles

Each student cuts and rearranges diagram pieces for pendulum or coaster paths to show transformations. Label forms and add friction losses. Share one prediction with a partner.

Prepare & details

Explain the Law of Conservation of Energy.

Facilitation Tip: Use the Energy Diagram Puzzles to reinforce labeling by having students explain their choices aloud before gluing pieces down.

Setup: Flexible space for group stations

Materials: Role cards with goals/resources, Game currency or tokens, Round tracker

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Teaching This Topic

Teachers often introduce energy conservation by letting students explore first, then guiding them to identify patterns in their observations. This inquiry approach avoids overwhelming students with definitions upfront. Instead, focus on building models where students can test ideas and revise their thinking based on evidence. Research shows that students grasp energy conservation better when they connect transformations to measurable changes in speed, height, or temperature.

What to Expect

Students should confidently describe energy transformations in both pendulums and roller coasters, using evidence from their models to explain conservation. They will justify their reasoning with observations of height, speed, and heat or sound production during activities. Successful learning includes accurate labeling of energy types and clear explanations of energy transfer.

Watch Out for These Misconceptions

Common Misconception

During the Pendulum Energy Tracker activity, watch for students who say the pendulum runs out of energy because it stops swinging.

What to Teach Instead

Remind students to feel the string near the pivot after several swings to notice warmth from friction and listen for faint sounds, then ask them to explain where that energy came from in their pendulum system.

Common Misconception

During the Marble Roller Coaster activity, watch for students who believe speed creates new energy on downhill sections.

What to Teach Instead

Have groups measure the marble’s starting height and speed at the bottom of each hill, then ask them to calculate if the total energy changed or just transformed between potential and kinetic.

Common Misconception

During the Marble Roller Coaster activity, watch for students who think total energy decreases as the marble travels downhill.

What to Teach Instead

Ask groups to use a thermometer to check the track and marble temperature before and after multiple runs, then discuss how friction converts some energy to heat while total energy remains constant.

Assessment Ideas

Exit Ticket

After the Pendulum Energy Tracker activity, provide students with a diagram of a pendulum at three points. Ask them to label the primary energy type at each point and explain how energy is conserved throughout the swing using observations from their activity.

Quick Check

After the Bouncing Ball Demo, present students with a scenario: 'A ball is dropped from a height of 5 meters.' Ask them to write down two energy transformations that occur as the ball falls and one form of energy produced when it hits the ground, referring to the heat or sound they observed during the demo.

Discussion Prompt

During the Marble Roller Coaster activity, pose the question: 'Where does the energy go as the marble moves up and down the track?' Have students discuss with partners all the energy transformations they observe, including those that are less obvious like heat from friction.

Extensions & Scaffolding

• Challenge groups to design a roller coaster with a loop that keeps the marble in contact with the track throughout, testing how speed and height affect success.
• Scaffolding for the Pendulum Energy Tracker: Provide printed labels for potential, kinetic, and lost energy to place on the string as they swing.
• Deeper exploration: Have students research how real roller coasters use energy conservation principles to maximize thrills while minimizing energy loss.

Key Vocabulary

Potential Energy	Stored energy an object possesses due to its position or state. For example, a roller coaster at the top of a hill has high potential energy.
Kinetic Energy	The energy an object possesses due to its motion. A moving roller coaster or a swinging pendulum has kinetic energy.
Energy Transformation	The process where energy changes from one form to another, such as potential energy converting to kinetic energy.
Law of Conservation of Energy	A fundamental principle stating that energy cannot be created or destroyed, only converted from one form to another within a closed system.
Thermal Energy	Energy related to heat, often produced as a byproduct of friction during energy transformations.