Potential Energy: Stored Energy

Active learning helps students grasp potential energy because it turns an invisible concept into something they can see, feel, and measure. When students manipulate objects like rubber bands or stacked books, they directly experience how position and shape store energy.

• 7th Grade
• Science
• 3 activities
• 15 min–50 min

Learning Objectives

1. Explain how an object's height and mass determine its gravitational potential energy.
2. Compare and contrast the factors affecting gravitational potential energy and elastic potential energy.
3. Predict the amount of work a stretched rubber band or a raised object can perform based on its stored potential energy.
4. Identify examples of chemical potential energy in everyday substances and explain how it is released.

Stations Rotation

⏱ 50 min·Small Groups

Stations Rotation: Potential Energy Stations

Students rotate through three stations: dropping balls from different heights to measure bounce height (gravitational), stretching rubber bands different distances to launch paper balls (elastic), and burning a food sample in a simple calorimeter to estimate chemical energy. At each station, students record data and identify what variable determines the amount of stored energy.

Prepare & details

Explain how the position of an object can determine its stored energy.

Facilitation Tip: During Potential Energy Stations, circulate to ensure students are testing each scenario as intended and recording observations in their notes, not just moving quickly through the stations.

Setup: Tables/desks arranged in 4-6 distinct stations around room

Materials: Station instruction cards, Different materials per station, Rotation timer

• Remember
• Understand
• Apply
• Analyze
• Self-Management
• Relationship Skills

Think-Pair-Share

⏱ 15 min·Pairs

Think-Pair-Share: Height and Stored Energy

Show a slow-motion video of a diver from different platform heights. Students individually sketch a diagram showing where potential energy is greatest and where it converts to kinetic energy, then compare their reasoning with a partner before sharing out.

Prepare & details

Compare and contrast gravitational potential energy with elastic potential energy.

Facilitation Tip: In the Height and Stored Energy Think-Pair-Share, provide sentence starters like 'The higher the object, the greater its gravitational potential energy because...' to guide students' explanations.

Setup: Standard classroom seating; students turn to a neighbor

Materials: Discussion prompt (projected or printed), Optional: recording sheet for pairs

• Understand
• Apply
• Analyze
• Self-Awareness
• Relationship Skills

Inquiry Circle

⏱ 40 min·Small Groups

Inquiry Circle: The Rubber Band Launcher

Groups stretch a rubber band to three different distances and launch a small projectile, measuring how far the projectile travels each time. They graph the relationship between stretch distance and launch distance to show how more stored elastic energy does more work.

Prepare & details

Predict the amount of work an object can do based on its potential energy.

Facilitation Tip: When launching the Rubber Band Launcher, ask students to measure both the stretch distance and the launch distance to emphasize the relationship between elastic potential energy and kinetic energy.

Setup: Groups at tables with access to source materials

Materials: Source material collection, Inquiry cycle worksheet, Question generation protocol, Findings presentation template

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

Teaching This Topic

Teachers often start with a quick demo, like holding a book above the floor, to introduce the idea that position stores energy. Avoid rushing to calculations; focus first on students feeling the tension in a stretched rubber band or the weight of a book held high. Research suggests that hands-on investigations build stronger conceptual understanding than abstract explanations alone.

What to Expect

Successful learning looks like students correctly identifying the type of potential energy in different scenarios and explaining how position or state affects stored energy. They should also connect their observations from activities to the definitions of gravitational, elastic, and chemical potential energy.

Watch Out for These Misconceptions

Common Misconception

During Potential Energy Stations, watch for students assuming potential energy only exists when an object is held high above the ground.

What to Teach Instead

Use the elastic potential energy station to redirect them: have students stretch a rubber band on the table and feel the tension to recognize that stored energy doesn't require height.

Common Misconception

During the Rubber Band Launcher activity, watch for students believing the rubber band must be released to have energy.

What to Teach Instead

Ask students to hold the stretched rubber band without releasing it, then have them feel the tension to connect the stored energy to the rubber band's position, not its motion.

Assessment Ideas

Quick Check

After Potential Energy Stations, present students with images of a compressed spring, a book on a shelf, a charged battery, and a stretched bow. Ask them to identify the primary type of potential energy in each and write a one-sentence justification.

Discussion Prompt

During the Height and Stored Energy Think-Pair-Share, pose the question: 'What happens to a ball’s gravitational potential energy as it rolls down a ramp?' Listen for explanations that mention the decrease in height leading to a decrease in stored energy and an increase in motion.

Exit Ticket

After the Rubber Band Launcher activity, have students complete an exit ticket answering: 1. Compare gravitational and elastic potential energy in one sentence. 2. Give an example of chemical potential energy and explain how it is released.

Extensions & Scaffolding

• Challenge: Ask students to design a system using both elastic and gravitational potential energy, such as a catapult or a pulley, and predict how far it will launch an object based on their measurements.
• Scaffolding: Provide a word bank with key terms like 'stretch,' 'height,' and 'chemical bonds' for students to use in their explanations during the Think-Pair-Share activity.
• Deeper exploration: Introduce the concept of energy conversion by having students research real-world examples, such as how a stretched bowstring converts elastic potential energy into kinetic energy when released.

Key Vocabulary

Potential Energy	Stored energy an object possesses due to its position, shape, or chemical composition.
Gravitational Potential Energy	The energy stored in an object due to its vertical position above a reference point, dependent on mass and height.
Elastic Potential Energy	The energy stored in a flexible object when it is stretched or compressed from its resting position.
Chemical Potential Energy	The energy stored within the chemical bonds of molecules, released during chemical reactions.