Activity 01
Pairs: Pendulum Predictions
Partners release a pendulum from varying heights and use a smartphone app to measure swing speeds. They predict maximum speed with conservation equations, then compare results and adjust for air resistance. Discuss discrepancies in pairs.
What does the law of conservation of energy mean , and does energy ever truly 'disappear' in a real-world system?
Facilitation TipFor Pair: Pendulum Predictions, ask students to predict the maximum height after three swings based on initial release height before they begin trials.
What to look forProvide students with a diagram of a pendulum at its highest point and lowest point. Ask them to: 1. Identify the primary form of energy at the highest point. 2. Identify the primary form of energy at the lowest point. 3. Explain how energy is conserved as the pendulum swings.
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Activity 02
Small Groups: Marble Ramp Challenges
Groups build ramps with cardboard and tape, measuring initial height and final speed of marbles. Apply conservation law to predict outcomes, test multiple designs, and graph energy changes. Share best designs with class.
How does accounting for energy transferred to the surroundings as heat or sound still support the law of conservation of energy?
Facilitation TipFor Small Groups: Marble Ramp Challenges, ensure groups test at least three ramp angles and record both start height and end height for analysis.
What to look forPresent students with a scenario: A 2 kg ball is dropped from a height of 10 meters. Assume no air resistance. Ask them to calculate: 1. The gravitational potential energy at the start. 2. The kinetic energy just before hitting the ground. 3. The speed of the ball just before hitting the ground.
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Activity 03
Whole Class: Collision Carts Demo
Set up low-friction tracks with carts of different masses. Launch and observe elastic/inelastic collisions, using motion sensors for velocity data. Class calculates total kinetic energy before and after to verify conservation.
How can the principle of energy conservation be used to predict the speed or height of an object without directly measuring the forces acting on it?
Facilitation TipFor Whole Class: Collision Carts Demo, have students sketch energy flow diagrams on whiteboards before and after collisions to visualize transformations.
What to look forPose the question: 'Imagine a car braking to a stop. How does the law of conservation of energy apply, even though the car's motion stops?' Guide students to discuss the transformation of kinetic energy into thermal energy in the brakes and tires, and sound energy.
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Activity 04
Individual: Energy Audit Worksheet
Students analyze diagrams of systems like a ski jump or bungee drop. Calculate potential to kinetic conversions, estimate losses, and predict final states. Self-check with provided answers.
What does the law of conservation of energy mean , and does energy ever truly 'disappear' in a real-world system?
Facilitation TipFor Individual: Energy Audit Worksheet, require students to include at least two forms of energy loss in each scenario they analyze.
What to look forProvide students with a diagram of a pendulum at its highest point and lowest point. Ask them to: 1. Identify the primary form of energy at the highest point. 2. Identify the primary form of energy at the lowest point. 3. Explain how energy is conserved as the pendulum swings.
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Generate Complete Lesson→A few notes on teaching this unit
Start with hands-on experiments before introducing equations. Students often struggle with the idea that energy isn’t lost, only transformed, so emphasize measurement of losses like heat from friction. Avoid rushing to calculations; let students debate energy transfers first. Research shows that guiding students to predict outcomes before measuring leads to stronger conceptual retention than immediate calculation practice.
Successful learning looks like students tracking energy forms through measurable trials, including losses to heat and sound. They should use equations to predict outcomes and explain where energy goes in real systems. By the end, they should confidently balance energy before and after events without relying on force calculations.
Watch Out for These Misconceptions
During Small Groups: Marble Ramp Challenges, watch for students who assume energy disappears when the marble slows down.
Have groups use a thermometer to measure temperature changes on the ramp surface after multiple trials, then recalculate energy using mgh = ½mv² + heat loss to show energy is accounted for as thermal energy.
During Whole Class: Collision Carts Demo, watch for students who think energy isn’t conserved because the carts stop moving.
Guide students to measure the temperature of the cart wheels and track after collisions, then adjust their energy calculations to include thermal energy from friction in the system totals.
During Pairs: Pendulum Predictions, watch for students who believe potential and kinetic energies are separate and don’t convert into each other.
Ask students to plot pendulum height versus speed data on graph paper, then draw a smooth curve to show the inverse relationship between the two energy types across swings.
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