Physics Year 11 - Module 2 - Lesson 8
Power
1. Key Ideas
An athlete and a walker climb the same stairs. They do the same work. But the athlete does it in 4 seconds — the walker takes 40. Same energy, very different power.
- P = ΔE/Δt — average power definition
- Why power and work are different quantities
2. Success Criteria
By the end, you should be able to:
- P = ΔE/Δt — average power definition
- P = Fv cosθ — power from force and velocity
- P = mgh/Δt — shortcut for vertical lifting
3. Key Terms
4. Activity: Build the Lesson Map
Use the lesson to complete the table. Keep answers brief but specific.
| Prompt | Your answer |
|---|---|
| Main concept | |
| Important example | |
| Common mistake to avoid | |
| How this links to the next lesson |
5. Short Answer Questions
1. Explain this lesson goal in your own words: "P = ΔE/Δt — average power definition". Use one specific example from the lesson.
2. Apply this idea to a new example: "P = Fv cosθ — power from force and velocity". Show your reasoning clearly.
3. Analyse why this idea matters for understanding Power: "P = mgh/Δt — shortcut for vertical lifting".
6. Extend: Apply the Idea
A student gives a memorised answer about Power but does not use evidence or reasoning.
Improve the answer by writing a stronger response that uses accurate terminology, a relevant example and a clear explanation.
7. Multiple Choice
1. What is the best first step when answering a question about Power?
A. Identify the key concept being tested
B. Write every fact from memory
C. Ignore the command word
D. Skip examples and evidence
2. Which answer would show stronger understanding of Power?
A. An answer with accurate terms and reasoning
B. A copied definition only
C. A single-word response
D. An answer with no example
3. What should you do if a question asks you to explain?
A. Link the idea to a reason or cause
B. List unrelated facts
C. Only draw a diagram
D. Write the shortest possible answer
8. Success Criteria Proof
Finish with evidence that you can do each success criterion.