Projectile Motion Review

Curriculum Area

Subject: Physics
Level: A-Level (Year 12)
Exam Board: Suitable for AQA, OCR, Edexcel
Topic: Mechanics – SUVAT Equations in Projectile Motion

This lesson aims to refine students' understanding of projectile motion through the use of SUVAT equations. The session includes a mix of theoretical review, worked examples, and interactive problem-solving.

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Lesson Objectives

By the end of this lesson, students should be able to:

• Understand how the SUVAT equations describe projectile motion.
• Apply SUVAT equations to solve problems involving free-fall and projectile motion.
• Distinguish between horizontal and vertical components of motion.
• Develop problem-solving strategies for exam-style questions.

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Lesson Structure (50 minutes)

1. Starter Activity (5 Minutes) – Think, Pair, Share

• Prompt: "What happens to an object in free fall? What forces act on it?"
• The student writes their thoughts, then explains aloud.
• If needed, provide a simple real-world example (e.g., dropping a ball, throwing a paper plane).

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2. Key Review of SUVAT Equations (10 Minutes)

• Write the five SUVAT equations on the board and briefly review them:
  • (s = ut + \frac{1}{2} a t^2)
  • (v^2 = u^2 + 2as)
  • (v = u + at)
  • (s = vt - \frac{1}{2} a t^2)
  • (s = \frac{u+v}{2}t)
• Discuss which variables apply in vertical motion ((a = -9.81 \text{m/s}^2)) vs horizontal motion ((a = 0)).
• Explain that projectiles experience independent horizontal and vertical motion.

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3. Interactive Problem Solving (20 Minutes)

• Worked Example: A ball is kicked from the ground with an initial velocity of 20 m/s at an angle of 30°. Find:
  1. Time of flight
  2. Maximum height reached
  3. Horizontal range

Step-by-Step Guide (Teacher-Led Explanation)

1. Resolve velocity into horizontal ((u_x = u \cos \theta)) and vertical components ((u_y = u \sin \theta)).
2. Use (s = ut + \frac{1}{2} a t^2) in vertical motion to find time to peak height.
3. Double the time for total flight duration.
4. Use (s = ut + \frac{1}{2} a t^2) again to find max height.
5. Finally, use horizontal motion formula ((s = u_x t)) for the range.

✏ Student Task: Solve a similar question with different values independently.

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4. Real-World Connection: Application Challenge (10 Minutes)

• Scenario: Engineers designing a water fountain must project water streams to land exactly in a basin a fixed distance away.
• Challenge Question: What initial velocity must water have to reach a basin 3m away if launched at a 45° angle?
• Encourage the student to describe their approach, even if they don’t fully solve it.

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5. Plenary (5 Minutes) – SUVAT Breakdown

• Ask the student to summarise their learning with: "If you had to teach projectile motion to someone else, how would you explain it?"
• Address any misconceptions
• Quickfire Q&A to reinforce key ideas

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Assessment & Homework

✅ In-Class Assessment: Accuracy in worked examples and correct application of SUVAT equations.
📚 Homework Task: Solve two projectile motion problems based on past A-Level exam questions.

Optional extension: Research the physics of a specific sport where projectile motion plays a role (e.g., football free kicks, javelin throw).

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Resources Needed

• Whiteboard and markers
• Scientific calculator
• A printed copy of SUVAT equations for quick reference
• A small ball for demonstration

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Teacher's Notes & Differentiation

• Support: If the student struggles, provide a step-by-step breakdown and scaffold their thought process.
• Challenge: Ask the student to derive one of the SUVAT equations from first principles using calculus.

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🎯 Wow Factor: Instead of standard board work, the teacher could act out projectile motion! Physically throwing a soft object (e.g., a small beanbag) and analysing its motion with real-time calculations can be highly engaging!