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Solar Windmill Engineering Lab ✨ cross-curricular

Teacher: TeacherAI | Grade: 4 | Subject: Math, Science, Technology | Duration: 60 minutes

📝 Description: Students measure angles with protractors to design windmill blades and collaborate on energy conversion devices for local wind power solutions.

Standards

  • 4.MD.5 (Recognize angles as geometric shapes that are formed wherever two rays share a common endpoint)
  • 4.MD.6 (Measure angles in whole-number degrees using a protractor. Sketch angles of specified measure)
  • 4.MD.7 (Recognize angle measure as additive. When an angle is decomposed into non-overlapping parts, the angle measure of the whole is the sum of the angle measures of the parts)
  • 4-PS3-4 (Apply scientific ideas to design, test, and refine a device that converts energy from one form to another)
  • TECH.4.7.c (Contribute constructively to project teams, assuming various roles to work toward common goals)
  • TECH.4.7.d (Explore local and global issues and use collaborative technologies to investigate solutions)

Learning Objectives

Students will be able to:

  • Identify angles formed by windmill blades as geometric shapes with a common endpoint
  • Measure blade angles accurately using a protractor to the nearest degree
  • Calculate total rotation angles by adding individual blade angle measurements
  • Design a paper windmill device that converts wind energy to rotational motion
  • Collaborate in assigned engineering roles to solve local energy challenges
  • Research and present wind energy solutions using digital collaboration tools

Supplies Needed

  • Protractors
  • Construction paper
  • Scissors
  • Pencils
  • Tablets or Chromebooks
  • Straight pins or brass fasteners (1 per student)

Lesson Structure

Opening (5 minutes)

Display a photo of local wind turbines or windmills on the board. Ask: "What angles do you notice in these energy devices? How might the angle of the blades affect how well they catch wind?" Introduce today's challenge: engineers will design windmills using precise angle measurements.

Main Activity (50 minutes)

Step-by-step instructions:

  1. Angle Discovery (8 minutes): Show students a simple paper windmill. Have them trace the angles formed where each blade meets the center with their finger. Demonstrate how to identify the vertex (center point) and rays (blade edges). Students practice identifying 3-4 angles on the windmill model.
  2. Protractor Practice (10 minutes): Model proper protractor placement on a drawn angle. Students practice measuring pre-drawn angles on the Windmill Angle Practice sheet, focusing on aligning the center hole with the vertex and the zero line with one ray.
  3. Team Formation and Roles (5 minutes): Divide class into teams of 4. Assign roles: Design Engineer (sketches windmill), Measurement Specialist (uses protractor), Materials Manager (cuts and assembles), and Research Coordinator (finds wind energy data on tablets).
  4. Digital Research Phase (10 minutes): Research Coordinators lead teams in finding local wind data and global wind energy solutions on tablets. Teams record findings on their Engineering Log, focusing on how blade angles affect energy capture.
  5. Design and Measure Phase (12 minutes): Design Engineers sketch 4-blade windmills on construction paper. Measurement Specialists use protractors to ensure each blade angle is exactly 90 degrees. Teams verify that all four angles add up to 360 degrees total.
  6. Construction and Testing (5 minutes): Materials Managers cut out windmill designs and attach to pencils with fasteners. Teams test their devices by blowing on them, observing rotation speed and discussing energy conversion from wind to motion.

Closing (5 minutes)

Teams share one finding from their research and demonstrate their windmill. Connect back to how precise angle measurement helped create effective energy conversion devices.

Quick Check: "What angle measurement tool did we use today? If a windmill blade creates a 45-degree angle, and you add another identical blade, what's the total angle? How does wind energy convert to rotational energy in our devices?"

Formative Assessment

During the lesson, look for:

  • Students correctly positioning protractors with the center hole on the vertex and zero line aligned with one ray
  • Teams demonstrating collaborative roles with each member contributing to the engineering process
  • Accurate calculation when students add individual blade angles to find total rotation measurements

Differentiation Strategies

Support for Struggling Students:

  • Provide pre-marked dots on construction paper showing exact protractor placement points
  • Offer angle measurement scaffolds with 30, 60, and 90-degree reference guides
  • Pair with strong measurement partners and provide hands-on protractor guidance

Challenge for Advanced Learners:

  • Design 6-blade or 8-blade windmills requiring more complex angle calculations
  • Research optimal blade angles for different wind speeds and test multiple designs
  • Calculate and compare efficiency ratios between different windmill angle configurations

ELL/ELD Support:

  • Provide visual vocabulary cards showing vertex, ray, angle, protractor, and energy conversion
  • Use collaborative tablet translation tools during research phase
  • Encourage demonstration and pointing when explaining angle measurements to teammates

Printable Materials

Windmill Angle Practice Sheet

Name: _________________ Date: _________________

Instructions: Use your protractor to measure each angle. Write your answer on the line.

Angle A: _______ degrees

Angle B: _______ degrees

Angle C: _______ degrees

Angle D: _______ degrees

Addition Challenge: If Angle A = 45° and Angle B = 30°, what is the total? _______ degrees

Engineering Team Log

Team Name: _________________

Team Role Student Name Responsibilities
Design Engineer Sketch windmill design
Measurement Specialist Use protractor for angles
Materials Manager Cut and assemble device
Research Coordinator Find wind energy data

Research Findings:

Local wind data: _________________________________

Global wind energy solution: _______________________

Angle Measurements:

Blade 1: ___° Blade 2: ___° Blade 3: ___° Blade 4: ___°

Total degrees: _______ (Should equal 360°)

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