Homeschool Guide: These lesson plans are a guide for parents. Content may contain errors — always cross-reference with official exam board specifications.

L1: Planetary Motion Gravity

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4 detailed 50-minute lessons with teaching scripts, worked examples, parent guides, and assessment criteria.

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Lesson Overview

Total Lessons: 4
Tier: Foundation and Higher
Duration: 50 minutes per lesson (200 minutes total)
Exam Boards: Edexcel

Learning Objectives

Prerequisites

Materials & Equipment

Lesson 1: Introduction: Planetary Motion Gravity

Duration: 50 minutes

Starter Activity (5 minutes)

Quick Recall

3 quick questions to activate prior knowledge about planetary motion gravity. Use mini-whiteboard or paper.

Main Content (35 minutes)

Parent/Teacher Guide:
Before lesson: Read script below. Prepare materials. Pre-teach key vocab: Planetary Motion Gravity.
If stuck: See Troubleshooting below. Break into smaller steps.
Extension: See Stretch & Challenge section.
Teaching Script (35 mins):
Mins 0-5 - Hook: "Today: Planetary Motion Gravity. Goal: by the end you can ✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre, using the method shown step by step. Connects to the previous lesson in this unit because you'll reuse its method throughout today's work."
Mins 5-15 - Direct Instruction: 1) Define: "Planetary Motion Gravity is..." 2) Key principle: "Most important:..." 3) Draw diagram, label live. 4) Real example: "Like ✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre - a real example worked through in full..."
Mins 15-25 - Guided Practice: Ex1: Teacher models. Ex2: Student tries with guidance. Ex3: Student independent.
Mins 25-35 - Independent Practice: 3-5 questions. Immediate feedback.
Worked Example 1: Basic

Q: ✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre

  1. What is asked? Explain
  2. Recall knowledge:
  3. Apply: ✗ Gravity is stronger at greater distances ✓ Gravitational force decreases with the square of the distance (inverse square law) ✗ Kepler's 3rd law says T = a³ ✓ Kepler's 3rd law says T² ∝ a³ (the square of the period is proportional to the cube of the semi-major axis)
  4. Check: Check the units named in the question and sense-check the size of your answer.
  5. Answer: a³ ✓ Kepler's 3rd law says T² ∝ a³ (the square of the period is proportional to the cube of the semi-major axis)

Tip: "Show working - method marks > answer marks."

Worked Example 2: Multi-step

Q: ✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre

  1. Break down: Separate parts?
  2. Solve each: ✗ Gravity is stronger at greater distances ✓ Gravitational force decreases with the square of the distance (inverse square law) ✗ Kepler's 3rd law says T = a³ ✓ Kepler's 3rd law says T² ∝ a³ (the square of the period is proportional to the cube of the semi-major axis)
  3. Combine: The parts chain: each answer feeds the next step of the question.
  4. Final answer: Evidence cited from the lesson content.
Worked Example 3: Data/Application

Q: ✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre

  1. Read data: Axes, units, scale
  2. Patterns: Trends, anomalies
  3. Explain: Why? Using planetary motion gravity
  4. Conclude: Evidence-based

Common Questions & Troubleshooting

Q: "Why does Planetary Motion Gravity work this way?"
A: Analogy: "✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre". Try re-draw or re-write the worked example from memory, then check it against the model answer.
Q: "Wrong answers on calculations."
A: Checklist: units? formula? calculator mode? sig figs?
Q: "Can't remember key terms."
A: Flashcards (term front, def+diagram back). Spaced repetition: day 1, 3, 7.
Q: "Exam wording confuses me."
A: Commands: Describe=what you see; Explain=reasons; Evaluate=pros/cons+judgement; Calculate=working+units.
Q: "Running out of time."
A: 1 mark/min. Skip hard, return. Attempt all - partial marks count.

Assessment & Model Answers

Mastery Checklist:
  • [ ] Define Planetary Motion Gravity in own words
  • [ ] Identify features in diagram
  • [ ] Explain process step-by-step
  • [ ] Apply to unfamiliar context
  • [ ] Score 80%+ on past paper question

Model Answer: Past Paper Question

Q: ✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre

  • 1 mark: [Key terminology]
  • 1 mark: [Mechanism/process]
  • 1 mark: [Application/example]
  • 1 mark: [Evaluation - Higher]

Model response: "[Complete answer with expected detail/terminology]"

Why full marks: [What makes this strong]

Stretch & Challenge (Grade 8-9):
  • Synoptic links: Connect to asteroids-comets-meteoroids / planets-properties
  • Real-world: Research use in industry, medicine or research
  • Advanced calc: Try a more challenging variant
  • Critical: "Evaluate limitations of today's model"
  • Research: Recent discovery on planetary motion gravity, summarise 100 words

Plenary (5 mins)

Label the Diagram

Unlabelled diagram - write all parts in 1 min

Assessment Criteria

Lesson 2: Core Concepts: Planetary Motion Gravity

Duration: 50 minutes

Starter Activity (5 minutes)

Review Previous Lesson

Quick recap: write 3 key points from last lesson on planetary motion gravity. Use mini-whiteboard or paper.

Main Content (35 minutes)

Parent/Teacher Guide:
Before lesson: Read script below. Prepare materials. Pre-teach key vocab: Planetary Motion Gravity.
If stuck: See Troubleshooting below. Break into smaller steps.
Extension: See Stretch & Challenge section.
Teaching Script (35 mins):
Mins 0-5 - Hook: "Today: Planetary Motion Gravity. Goal: by the end you can ✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre, using the method shown step by step. Connects to the previous lesson in this unit because you'll reuse its method throughout today's work."
Mins 5-15 - Direct Instruction: 1) Define: "Planetary Motion Gravity is..." 2) Key principle: "Most important:..." 3) Draw diagram, label live. 4) Real example: "Like ✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre - a real example worked through in full..."
Mins 15-25 - Guided Practice: Ex1: Teacher models. Ex2: Student tries with guidance. Ex3: Student independent.
Mins 25-35 - Independent Practice: 3-5 questions. Immediate feedback.
Worked Example 1: Basic

Q: ✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre

  1. What is asked? Explain
  2. Recall knowledge:
  3. Apply: ✗ Gravity is stronger at greater distances ✓ Gravitational force decreases with the square of the distance (inverse square law) ✗ Kepler's 3rd law says T = a³ ✓ Kepler's 3rd law says T² ∝ a³ (the square of the period is proportional to the cube of the semi-major axis)
  4. Check: Check the units named in the question and sense-check the size of your answer.
  5. Answer: a³ ✓ Kepler's 3rd law says T² ∝ a³ (the square of the period is proportional to the cube of the semi-major axis)

Tip: "Show working - method marks > answer marks."

Worked Example 2: Multi-step

Q: ✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre

  1. Break down: Separate parts?
  2. Solve each: ✗ Gravity is stronger at greater distances ✓ Gravitational force decreases with the square of the distance (inverse square law) ✗ Kepler's 3rd law says T = a³ ✓ Kepler's 3rd law says T² ∝ a³ (the square of the period is proportional to the cube of the semi-major axis)
  3. Combine: The parts chain: each answer feeds the next step of the question.
  4. Final answer: Evidence cited from the lesson content.
Worked Example 3: Data/Application

Q: ✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre

  1. Read data: Axes, units, scale
  2. Patterns: Trends, anomalies
  3. Explain: Why? Using planetary motion gravity
  4. Conclude: Evidence-based

Common Questions & Troubleshooting

Q: "Why does Planetary Motion Gravity work this way?"
A: Analogy: "✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre". Try re-draw or re-write the worked example from memory, then check it against the model answer.
Q: "Wrong answers on calculations."
A: Checklist: units? formula? calculator mode? sig figs?
Q: "Can't remember key terms."
A: Flashcards (term front, def+diagram back). Spaced repetition: day 1, 3, 7.
Q: "Exam wording confuses me."
A: Commands: Describe=what you see; Explain=reasons; Evaluate=pros/cons+judgement; Calculate=working+units.
Q: "Running out of time."
A: 1 mark/min. Skip hard, return. Attempt all - partial marks count.

Assessment & Model Answers

Mastery Checklist:
  • [ ] Define Planetary Motion Gravity in own words
  • [ ] Identify features in diagram
  • [ ] Explain process step-by-step
  • [ ] Apply to unfamiliar context
  • [ ] Score 80%+ on past paper question

Model Answer: Past Paper Question

Q: ✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre

  • 1 mark: [Key terminology]
  • 1 mark: [Mechanism/process]
  • 1 mark: [Application/example]
  • 1 mark: [Evaluation - Higher]

Model response: "[Complete answer with expected detail/terminology]"

Why full marks: [What makes this strong]

Stretch & Challenge (Grade 8-9):
  • Synoptic links: Connect to asteroids-comets-meteoroids / planets-properties
  • Real-world: Research use in industry, medicine or research
  • Advanced calc: Try a more challenging variant
  • Critical: "Evaluate limitations of today's model"
  • Research: Recent discovery on planetary motion gravity, summarise 100 words

Plenary (5 mins)

Label the Diagram

Unlabelled diagram - write all parts in 1 min

Assessment Criteria

Lesson 3: Application: Planetary Motion Gravity

Duration: 50 minutes

Starter Activity (5 minutes)

Review Previous Lesson

Quick recap: write 3 key points from last lesson on planetary motion gravity. Use mini-whiteboard or paper.

Main Content (35 minutes)

Parent/Teacher Guide:
Before lesson: Read script below. Prepare materials. Pre-teach key vocab: Planetary Motion Gravity.
If stuck: See Troubleshooting below. Break into smaller steps.
Extension: See Stretch & Challenge section.
Teaching Script (35 mins):
Mins 0-5 - Hook: "Today: Planetary Motion Gravity. Goal: by the end you can ✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre, using the method shown step by step. Connects to the previous lesson in this unit because you'll reuse its method throughout today's work."
Mins 5-15 - Direct Instruction: 1) Define: "Planetary Motion Gravity is..." 2) Key principle: "Most important:..." 3) Draw diagram, label live. 4) Real example: "Like ✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre - a real example worked through in full..."
Mins 15-25 - Guided Practice: Ex1: Teacher models. Ex2: Student tries with guidance. Ex3: Student independent.
Mins 25-35 - Independent Practice: 3-5 questions. Immediate feedback.
Worked Example 1: Basic

Q: ✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre

  1. What is asked? Explain
  2. Recall knowledge:
  3. Apply: ✗ Gravity is stronger at greater distances ✓ Gravitational force decreases with the square of the distance (inverse square law) ✗ Kepler's 3rd law says T = a³ ✓ Kepler's 3rd law says T² ∝ a³ (the square of the period is proportional to the cube of the semi-major axis)
  4. Check: Check the units named in the question and sense-check the size of your answer.
  5. Answer: a³ ✓ Kepler's 3rd law says T² ∝ a³ (the square of the period is proportional to the cube of the semi-major axis)

Tip: "Show working - method marks > answer marks."

Worked Example 2: Multi-step

Q: ✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre

  1. Break down: Separate parts?
  2. Solve each: ✗ Gravity is stronger at greater distances ✓ Gravitational force decreases with the square of the distance (inverse square law) ✗ Kepler's 3rd law says T = a³ ✓ Kepler's 3rd law says T² ∝ a³ (the square of the period is proportional to the cube of the semi-major axis)
  3. Combine: The parts chain: each answer feeds the next step of the question.
  4. Final answer: Evidence cited from the lesson content.
Worked Example 3: Data/Application

Q: ✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre

  1. Read data: Axes, units, scale
  2. Patterns: Trends, anomalies
  3. Explain: Why? Using planetary motion gravity
  4. Conclude: Evidence-based

Common Questions & Troubleshooting

Q: "Why does Planetary Motion Gravity work this way?"
A: Analogy: "✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre". Try re-draw or re-write the worked example from memory, then check it against the model answer.
Q: "Wrong answers on calculations."
A: Checklist: units? formula? calculator mode? sig figs?
Q: "Can't remember key terms."
A: Flashcards (term front, def+diagram back). Spaced repetition: day 1, 3, 7.
Q: "Exam wording confuses me."
A: Commands: Describe=what you see; Explain=reasons; Evaluate=pros/cons+judgement; Calculate=working+units.
Q: "Running out of time."
A: 1 mark/min. Skip hard, return. Attempt all - partial marks count.

Assessment & Model Answers

Mastery Checklist:
  • [ ] Define Planetary Motion Gravity in own words
  • [ ] Identify features in diagram
  • [ ] Explain process step-by-step
  • [ ] Apply to unfamiliar context
  • [ ] Score 80%+ on past paper question

Model Answer: Past Paper Question

Q: ✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre

  • 1 mark: [Key terminology]
  • 1 mark: [Mechanism/process]
  • 1 mark: [Application/example]
  • 1 mark: [Evaluation - Higher]

Model response: "[Complete answer with expected detail/terminology]"

Why full marks: [What makes this strong]

Stretch & Challenge (Grade 8-9):
  • Synoptic links: Connect to asteroids-comets-meteoroids / planets-properties
  • Real-world: Research use in industry, medicine or research
  • Advanced calc: Try a more challenging variant
  • Critical: "Evaluate limitations of today's model"
  • Research: Recent discovery on planetary motion gravity, summarise 100 words

Plenary (5 mins)

Exam Question Speed Round

5 quick questions, 1 min each. Mark together.

Assessment Criteria

Lesson 4: Exam Practice: Planetary Motion Gravity

Duration: 50 minutes

Starter Activity (5 minutes)

Review Previous Lesson

Quick recap: write 3 key points from last lesson on planetary motion gravity. Use mini-whiteboard or paper.

Main Content (35 minutes)

Parent/Teacher Guide:
Before lesson: Read script below. Prepare materials. Pre-teach key vocab: Planetary Motion Gravity.
If stuck: See Troubleshooting below. Break into smaller steps.
Extension: See Stretch & Challenge section.
Teaching Script (35 mins):
Mins 0-5 - Hook: "Today: Planetary Motion Gravity. Goal: by the end you can ✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre, using the method shown step by step. Connects to the previous lesson in this unit because you'll reuse its method throughout today's work."
Mins 5-15 - Direct Instruction: 1) Define: "Planetary Motion Gravity is..." 2) Key principle: "Most important:..." 3) Draw diagram, label live. 4) Real example: "Like ✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre - a real example worked through in full..."
Mins 15-25 - Guided Practice: Ex1: Teacher models. Ex2: Student tries with guidance. Ex3: Student independent.
Mins 25-35 - Independent Practice: 3-5 questions. Immediate feedback.
Worked Example 1: Basic

Q: ✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre

  1. What is asked? Explain
  2. Recall knowledge:
  3. Apply: ✗ Gravity is stronger at greater distances ✓ Gravitational force decreases with the square of the distance (inverse square law) ✗ Kepler's 3rd law says T = a³ ✓ Kepler's 3rd law says T² ∝ a³ (the square of the period is proportional to the cube of the semi-major axis)
  4. Check: Check the units named in the question and sense-check the size of your answer.
  5. Answer: a³ ✓ Kepler's 3rd law says T² ∝ a³ (the square of the period is proportional to the cube of the semi-major axis)

Tip: "Show working - method marks > answer marks."

Worked Example 2: Multi-step

Q: ✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre

  1. Break down: Separate parts?
  2. Solve each: ✗ Gravity is stronger at greater distances ✓ Gravitational force decreases with the square of the distance (inverse square law) ✗ Kepler's 3rd law says T = a³ ✓ Kepler's 3rd law says T² ∝ a³ (the square of the period is proportional to the cube of the semi-major axis)
  3. Combine: The parts chain: each answer feeds the next step of the question.
  4. Final answer: Evidence cited from the lesson content.
Worked Example 3: Data/Application

Q: ✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre

  1. Read data: Axes, units, scale
  2. Patterns: Trends, anomalies
  3. Explain: Why? Using planetary motion gravity
  4. Conclude: Evidence-based

Common Questions & Troubleshooting

Q: "Why does Planetary Motion Gravity work this way?"
A: Analogy: "✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre". Try re-draw or re-write the worked example from memory, then check it against the model answer.
Q: "Wrong answers on calculations."
A: Checklist: units? formula? calculator mode? sig figs?
Q: "Can't remember key terms."
A: Flashcards (term front, def+diagram back). Spaced repetition: day 1, 3, 7.
Q: "Exam wording confuses me."
A: Commands: Describe=what you see; Explain=reasons; Evaluate=pros/cons+judgement; Calculate=working+units.
Q: "Running out of time."
A: 1 mark/min. Skip hard, return. Attempt all - partial marks count.

Assessment & Model Answers

Mastery Checklist:
  • [ ] Define Planetary Motion Gravity in own words
  • [ ] Identify features in diagram
  • [ ] Explain process step-by-step
  • [ ] Apply to unfamiliar context
  • [ ] Score 80%+ on past paper question

Model Answer: Past Paper Question

Q: ✗ Planets orbit in perfect circles ✓ Kepler's first law states orbits are ellipses with the Sun at one focus, not the centre

  • 1 mark: [Key terminology]
  • 1 mark: [Mechanism/process]
  • 1 mark: [Application/example]
  • 1 mark: [Evaluation - Higher]

Model response: "[Complete answer with expected detail/terminology]"

Why full marks: [What makes this strong]

Stretch & Challenge (Grade 8-9):
  • Synoptic links: Connect to asteroids-comets-meteoroids / planets-properties
  • Real-world: Research use in industry, medicine or research
  • Advanced calc: Try a more challenging variant
  • Critical: "Evaluate limitations of today's model"
  • Research: Recent discovery on planetary motion gravity, summarise 100 words

Plenary (5 mins)

Exam Question Speed Round

5 quick questions, 1 min each. Mark together.

Assessment Criteria

📝 Mark Scheme Guidance

How examiners mark L1: Read the command word carefully — State = one word/phrase (1 mark), Describe = pattern or detail (2 marks), Explain = reason with "because" (2–3 marks), Compare = similarities AND differences, Evaluate = both sides + conclusion. Method marks are awarded for correct working even if the final answer is wrong. Always show your working — unexplained answers score zero for AO2.

Success on L1 questions: Underline the command word, count the marks (one mark per point expected), and answer in the format the command word demands.

Board Notes & Revision Links

This lesson is examined by: Edexcel 1AS0. Tier and paper details vary - always check your board's current specification.

Follow-up revision: as10-planetary-motion-gravity on GCSE Revise (notes, flashcards and auto-graded target tests for this exact topic).

Homework & Consolidation

Recommended Resources

🎓 Smart Lesson (Guided)