A wind-powered car is a small vehicle that moves when moving air pushes on its sail. It is a fun school project because you can build it from simple materials like cardboard, straws, bottle caps, and paper. The project shows how wind energy can become motion.
It also helps students test, improve, and compare different designs.
Key Facts
- Wind is moving air that can push on objects and transfer energy.
- A larger sail can catch more wind, but it can also add weight and wobble.
- Less friction at the wheels helps the car roll farther and faster.
- Speed = distance ÷ time.
- Distance = speed × time.
- A fair test changes only one design feature at a time, such as sail size or wheel type.
Vocabulary
- Wind energy
- Wind energy is the energy carried by moving air.
- Sail
- A sail is a flat surface that catches wind and helps push a vehicle forward.
- Axle
- An axle is a rod or straw that holds wheels and lets them spin.
- Friction
- Friction is a force that slows motion when surfaces rub against each other.
- Aerodynamics
- Aerodynamics is the study of how air moves around objects.
Common Mistakes to Avoid
- Making the sail too floppy, which is wrong because the wind bends it instead of pushing the car forward well.
- Attaching the wheels too tightly, which is wrong because extra friction keeps the wheels from spinning freely.
- Putting the sail far to one side, which is wrong because the car may turn or tip instead of moving straight.
- Testing with different wind strengths each time, which is wrong because you cannot tell whether the car improved or the wind changed.
Practice Questions
- 1 A wind-powered car travels 120 cm in 6 seconds. What is its speed in cm/s?
- 2 Car A travels 90 cm and Car B travels 135 cm using the same fan for the same amount of time. How much farther does Car B travel than Car A?
- 3 A student changes from a small paper sail to a much larger paper sail, but the car goes a shorter distance. Explain two possible reasons why the larger sail did not help.