Activity 01
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.
Explain the Law of Conservation of Energy.
Facilitation TipDuring 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.
What to look forProvide students with a diagram of a swinging pendulum. Ask them to label three points on the swing and describe the primary type of energy (potential, kinetic) at each point, and explain how energy is conserved throughout the swing.
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Activity 02
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.
Analyze how energy is conserved in a swinging pendulum.
Facilitation TipFor 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.
What to look forPresent students with a scenario: 'A ball is dropped from a height of 10 meters.' Ask them to write down two energy transformations that occur as the ball falls, and one form of energy that might be produced when it hits the ground.
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Activity 03
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.
Predict the energy transformations in a roller coaster ride.
Facilitation TipDuring the Bouncing Ball Demo, have students touch the floor where the ball lands to feel any warmth from energy transfer.
What to look forPose the question: 'Imagine a toy car rolling down a ramp and then up another. Where does the energy go? Discuss with a partner all the places energy might be found or transformed during this process, even if it's not obvious.'
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Activity 04
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.
Explain the Law of Conservation of Energy.
Facilitation TipUse the Energy Diagram Puzzles to reinforce labeling by having students explain their choices aloud before gluing pieces down.
What to look forProvide students with a diagram of a swinging pendulum. Ask them to label three points on the swing and describe the primary type of energy (potential, kinetic) at each point, and explain how energy is conserved throughout the swing.
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Generate Complete Lesson→A few notes on teaching this unit
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.
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
During the Pendulum Energy Tracker activity, watch for students who say the pendulum runs out of energy because it stops swinging.
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.
During the Marble Roller Coaster activity, watch for students who believe speed creates new energy on downhill sections.
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.
During the Marble Roller Coaster activity, watch for students who think total energy decreases as the marble travels downhill.
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.
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