Lesson Plan

• Define pressure as force per unit area and state its SI unit (pascal).
• Apply the formula p = F / A to calculate pressure, force, or area in given situations.
• Convert pressure values between Pa, kPa, and mm Hg and explain when each unit is appropriate.
• Analyse how changing the contact area influences the magnitude of pressure.
• Identify and correct common misconceptions about pressure versus force.

• Projector or interactive whiteboard
• Printed worksheet with practice questions
• Calculator for each student
• Block and flat surface for a simple pressure demonstration
• Ruler or measuring tape to determine contact area
• Pressure unit conversion chart (Pa, kPa, mm Hg)
• Diagram handout showing force, area, and pressure

Begin with a quick question: “Why does a nail cut wood more easily than a hammer?” This hooks students by linking everyday experience to pressure. Review prior knowledge of force (newtons) and area (square metres) before stating the success criteria: students will be able to define pressure, use p = F/A, and convert units.

1. Do‑now (5') – Students answer a short prompt on the difference between force and pressure.
2. Mini‑lecture (10') – Define pressure, introduce p = F/A, discuss SI units and alternative units, show diagram.
3. Guided example (8') – Work through the textbook example (250 N, 0.05 m²) step‑by‑step.
4. Hands‑on demonstration (7') – Use the block and surface to measure force and area, calculate pressure together.
5. Practice activity (12') – In pairs, students solve the three practice questions on nails, hydraulic press, and unit conversion.
6. Misconception check (5') – Discuss common errors (pressure ≠ force, shape vs area, unit mixing) using student responses.
7. Summary & exit ticket (5') – Recap key points; students write one correct definition and one example on a sticky note.

Summarise that pressure measures how concentrated a force is over an area and that correct unit conversion is essential. Collect the exit tickets to gauge understanding, and assign homework: complete a worksheet with additional pressure problems and find a real‑world example of pressure (e.g., tyre pressure, blood pressure) to bring to the next class.