Lesson Plan

• Recall the formula ΔE_p = m g Δh and explain the meaning of each variable.
• Describe how the sign of Δh determines whether gravitational potential energy increases or decreases.
• Apply the formula to calculate ΔE_p for given masses and height changes, using correct units and sign.

• Whiteboard and markers
• Projector with slides (formula, worked example)
• Calculators (one per student)
• Worksheet with practice problems
• Small objects for demonstration (textbook, ball)
• Ruler or measuring tape

Begin with a quick demonstration of lifting a textbook onto a shelf while asking students what changes for the object. Connect this to prior learning about work and energy, and state that by the end of the lesson they will be able to calculate the change in gravitational potential energy using ΔE_p = m g Δh.

1. Do‑now (5') – Students answer: “If you raise a 1 kg object by 2 m, what happens to its energy?” Collect responses.
2. Mini‑lecture (10') – Present the formula, define m, g, Δh, discuss sign convention and units.
3. Guided practice (12') – Work through the textbook example together, projecting each step.
4. Independent practice (15') – Students complete worksheet problems while teacher circulates.
5. Check for understanding (5') – Quick quiz (exit ticket) with one problem to solve.
6. Extension discussion (8') – Explore an extension question and relate to real‑world situations.

Summarise that ΔE_p = m g Δh links mass, gravity and height to energy change, and that correct sign and units are essential. Students submit an exit ticket solving a new problem, and homework is a set of three additional calculations.