Description
StemWizz 3-Gear Car – 1 Exciting STEM Project for Young People
Introduction
The StemWizz 3-Gear Car is a hands-on STEM project designed to teach young people how gears work together to create motion. This project gives them the chance to build a working model car from scratch — learning about gear ratios, torque, and how mechanical energy is transferred through a gear system to make the car move forward.
Why Choose the StemWizz 3-Gear Car?
The StemWizz 3-Gear Car offers a fun, engaging way to explore engineering principles. Young people assemble the wooden chassis, attach axles and wheels, install the motor, and connect the three-gear transmission system. They finish by wiring the motor to the battery box and watching their creation drive forward.
Key benefits include:
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Learn how three gears interact to transmit power
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Understand torque, speed, and gear ratios
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Get practical experience assembling a working car
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Build confidence, problem-solving skills, and fine motor control
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How It Works
This project begins by building the wooden chassis, which forms the base for the gears, motor, and axles. Young people then add three interlocking gears to create a simple transmission system. The gears increase or decrease the motor’s speed, depending on their size and arrangement, giving them an intuitive understanding of gear ratios. Finally, they connect the motor to the battery box and test their car — adjusting as needed until it runs smoothly.
This hands-on build reinforces core STEM concepts, showing how gears are used in everything from bicycles to car engines.
STEM Learning Outcomes
The StemWizz 3-Gear Car is a complete mechanical and electrical engineering activity:
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Gear Ratios: Learn how three gears interact and affect speed/torque.
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Mechanical Engineering: Build a car chassis with axles and wheels.
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Electrical Wiring: Connect a DC motor to a battery box to power the car.
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Critical Thinking: Troubleshoot and adjust gear placement for best results.
Pair it with our StemWizz Battery Wooden Race Car to compare different drive systems, or explore the StemWizz Master Mechanic Box for a more advanced mechanical challenge.
⚙️ Gears and motors work together to transform simple motion into powerful mechanical systems. The motor provides the energy, while gears control speed, torque, and direction, allowing machines to move efficiently and precisely. When young people explore how gears and motors combine, they begin to understand the foundations of engineering and robotics—how energy is transferred, controlled, and applied to create real movement. It’s a core concept at the heart of StemWizz learning.
Who Is It For?
The StemWizz 3-Gear Car is perfect for:
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Young people aged 8+ interested in engineering and mechanics
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Parents looking for educational building kits
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Teachers seeking STEM classroom activities
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STEM clubs, after-school groups, and homeschoolers
Why StemWizz?
At StemWizz, we create projects that make STEM learning practical and exciting. The 3-Gear Car introduces key mechanical principles in a hands-on way, helping young people see how gears work in the real world.
👉 Learn more about mechanical systems and STEM education at STEM.org.
Technical Details
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Difficulty Level: 8/10
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Age Rating: 12+
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Includes: Wooden chassis, 3 gears, DC motor, battery box, axles, wheels, wiring
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Build Time: 60–90 minutes
Conclusion
The StemWizz 3-Gear Car is a brilliant way to introduce young people to gears, motion, and simple mechanics. They’ll finish the project with a running car, a better understanding of engineering, and a big sense of achievement. Whether at home, in school, or in a STEM club, this project makes learning hands-on and fun.
If you want to explore more Gears & Motors STEM Projects
Also see here for more information on gears & motors
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