CARRINHO movido a VINAGRE e BICARBONATO de SÓDIO

Summary

This video demonstrates how to build a fun and innovative car powered by unconventional fuels like Coca-Cola and Mentos or vinegar and baking soda. Using basic materials such as cardboard, straws, and CDs, the project guides viewers through the step-by-step process of assembling the car, setting up the fuel system, and fine-tuning the design. Despite some trial-and-error, the car's propulsion relies on chemical reactions that generate gas pressure, propelling it forward. The project also includes tips on improving the design for better performance, with a backup car available for testing. A more cost-effective version using a rat trap is also introduced.

Takeaways

• 😀 You can create a car powered by a unique fuel, combining Coca-Cola and Mentos or vinegar and baking soda.
• 😀 This project is ideal for science fairs, where you can compete to build the most efficient car.
• 😀 The materials needed for the project include cardboard, rubber bands, straws, barbecue skewers, bottle caps, CDs, and basic household ingredients.
• 😀 The car's chassis is made from cardboard rectangles, with measurements of 11x18 cm and 9x6 cm for the cut-out area.
• 😀 To reinforce the chassis, fold and glue a triangular piece of cardboard inside for added stability.
• 😀 The car's wheels are made from CDs, and their axles are supported by straws, ensuring proper distance for smooth rotation.
• 😀 It’s essential to align the wheels properly for better performance and avoid misalignment during operation.
• 😀 The car’s propulsion comes from a chemical reaction where the release of gas from the fuel propels the car forward.
• 😀 To control the release of gas, a special setup with a Mentos candy and a magnetic stopper is used for the Coca-Cola version.
• 😀 Alternatively, the vinegar and baking soda method uses a sealed bottle with a chemical reaction to generate gas and propel the car.
• 😀 There’s also a more straightforward version using a mousetrap, which can be reused multiple times to power the car without needing large quantities of fuel.

Q & A

What is the main goal of the project in the video?

The main goal of the project is to create a car powered by a chemical reaction, using ingredients like Coca-Cola, Mentos, or vinegar and baking soda. This car can be used for fun competitions, such as in a science fair.

What materials are required to build the car?

The materials needed to build the car include cardboard, elastic, a straw, barbecue skewers, bottle caps, 4 CDs, and either Coca-Cola and Mentos or vinegar and baking soda as fuel.

What is the purpose of the cardboard rectangles?

The cardboard rectangles are used to create the base or chassis of the car. The dimensions are 11 cm by 18 cm, and a smaller rectangle (9 cm by 6 cm) is drawn and cut out to help support the bottle in the car's design.

Why are CDs used as the wheels of the car?

CDs are used as wheels because they are flat, circular, and provide a stable base for the car’s movement. The size and shape are ideal for creating a simple yet functional wheel system.

How are the axles attached to the car?

The axles are created using barbecue skewers and are placed through straws glued to the bottom of the cardboard chassis. The straws act as supports to hold the axles and allow the wheels (CDs) to rotate.

What is the purpose of the bottle caps in the design?

The bottle caps are used to hold the wheels onto the axles. A hole is drilled through the caps, aligning them with the holes in the CDs. This allows the wheels to rotate freely while remaining securely attached to the car.

How is the fuel system designed to propel the car forward?

The fuel system works by creating a chemical reaction that generates gas pressure. In the Coca-Cola version, Mentos are added to the soda to release carbon dioxide gas. In the vinegar and baking soda version, the reaction creates carbon dioxide gas, which builds pressure inside the bottle and pushes the car forward.

What technique is used to control the release of the Mentos into the Coca-Cola?

A technique is used where a metal washer is placed in the bottle, held in place by a magnet. This allows the Mentos to be held inside until the moment of release. When the magnet is removed, the Mentos drop into the soda, triggering the reaction.

What modifications were made to improve the car's performance during testing?

To improve performance, the team replaced weak wooden skewers with stronger bamboo sticks for the axles and ensured the wheels were securely attached with additional caps. They also shortened the length of the straw to prevent excessive fuel waste and improved the alignment of the wheels for smoother movement.

Which fuel source resulted in the best performance for the car?

The vinegar and baking soda fuel source resulted in better performance, with the car traveling further compared to the Coca-Cola and Mentos version, which was less stable due to the unpredictable nature of the reaction.