Kinetic and Potential Energy

Active learning provides the best window into impulse and momentum because students must feel the difference between a sudden stop and a gradual one. Activities like Egg Drop 2.0 let students test their own designs, while role-play and sports analysis connect abstract physics to real-world consequences.

• 12th Grade
• Physics
• 3 activities
• 20 min–90 min

Learning Objectives

1. Calculate the kinetic energy of an object given its mass and velocity.
2. Compare and contrast gravitational potential energy and elastic potential energy by identifying their respective formulas and dependencies.
3. Explain the energy transformations between kinetic and potential energy in a system, such as a pendulum or a bouncing ball.
4. Analyze how changes in mass or velocity affect an object's kinetic energy.
5. Predict the change in kinetic energy of an object as its gravitational potential energy increases or decreases.

Inquiry Circle

⏱ 90 min·Small Groups

Inquiry Circle: The Egg Drop 2.0

Instead of just protecting the egg, students must use force sensors to measure the 'impulse' of the landing. They iterate their designs to specifically increase the time of impact and lower the peak force.

Prepare & details

Explain how kinetic energy is related to an object's mass and speed.

Facilitation Tip: During The Egg Drop 2.0, circulate with a stopwatch to time each drop and remind students to record both the height and the catch duration, not just whether the egg survives.

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

Role Play

⏱ 60 min·Small Groups

Role Play: Accident Reconstruction Team

Students act as forensic engineers using skid marks and vehicle masses to determine the initial speeds of two cars involved in a collision. They present their findings in a mock 'courtroom' setting.

Prepare & details

Compare and contrast gravitational potential energy and elastic potential energy.

Facilitation Tip: When running the Accident Reconstruction Team role play, assign roles that force students to quantify speeds and times before they assign blame or fault.

Setup: Open space or rearranged desks for scenario staging

Materials: Character cards with backstory and goals, Scenario briefing sheet

• Apply
• Analyze
• Evaluate
• Social Awareness
• Self-Awareness

Think-Pair-Share

⏱ 20 min·Pairs

Think-Pair-Share: Follow-Through in Sports

Students discuss why a golfer or baseball player follows through after hitting the ball. Pairs explain the relationship between contact time and the final velocity of the ball using the impulse-momentum theorem.

Prepare & details

Predict the change in kinetic energy of an object as its potential energy changes.

Facilitation Tip: For the Think-Pair-Share on Follow-Through in Sports, give each pair one foam ball and a timer so they can measure how release time changes with different follow-through motions.

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

Teaching This Topic

Teachers should start with simple collisions on air tracks to isolate momentum conservation before adding forces and energy losses. Avoid rushing to elastic versus inelastic labels; let students discover that momentum conservation holds regardless of energy type. Research shows that students grasp impulse best when they physically experience the same change in momentum delivered over different times.

What to Expect

Successful learning looks like students predicting outcomes, measuring changes in momentum, and explaining why padding or follow-through reduces force. They should use evidence from their investigations to justify conservation claims and critique designs that fail to protect objects or bodies.

Watch Out for These Misconceptions

Common Misconception

During The Egg Drop 2.0, watch for students who assume a softer landing always means less momentum change.

What to Teach Instead

Use the air track with Velcro bumpers to show that momentum is conserved in every collision, but the force—and thus the impulse—changes with the duration of contact. Ask students to calculate momentum before and after each drop to reinforce the conservation principle.

Common Misconception

During Think-Pair-Share: Follow-Through in Sports, watch for students who think a harder throw always results in more momentum transfer.

What to Teach Instead

Have students measure the time their hands are in contact with the ball during follow-through versus a quick flick. Guide them to see that increasing contact time with a constant force can increase impulse without changing speed.

Assessment Ideas

Quick Check

After the energy scenarios activity, collect student responses and sort them into three categories: those who correctly identify energy types, those who confuse kinetic and potential, and those who mention transformations. Use the results to form review groups before the next lesson.

Exit Ticket

During The Egg Drop 2.0, have students complete an exit ticket that asks them to predict the force their device will experience if the drop height increases by 10 cm, and explain their reasoning using momentum and impulse.

Discussion Prompt

After the Think-Pair-Share on Follow-Through in Sports, facilitate a whole-class discussion where students compare the impulse-momentum graphs they created. Ask them to explain how follow-through changes the force experienced by the ball and the thrower.

Extensions & Scaffolding

• Challenge: Ask students to design a landing pad for a 50 g mass dropped from 2 m that keeps the force below 2 N using only index cards and tape.
• Scaffolding: Provide pre-labeled graphs of force vs. time for students to match to their own data during Egg Drop 2.0.
• Deeper exploration: Have students research crumple zones in cars and present a one-page analysis linking their Egg Drop designs to real automotive safety features.

Key Vocabulary

Kinetic Energy	The energy an object possesses due to its motion. It is dependent on the object's mass and velocity.
Potential Energy	Stored energy that an object has due to its position or state. It has the potential to be converted into other forms of energy.
Gravitational Potential Energy	The potential energy an object possesses because of its position in a gravitational field, typically relative to Earth's surface. It depends on mass, gravitational acceleration, and height.
Elastic Potential Energy	The potential energy stored in a deformable object, such as a spring or rubber band, when it is stretched or compressed from its equilibrium position.
Energy Conservation	The principle that in an isolated system, the total energy remains constant. Energy can be transformed from one form to another, but it is neither created nor destroyed.