How to Build Fast LEGO Cars

By Kelly Harris
LEGO pieces can be stacked together to make a variety of shapes.
LEGO pieces can be stacked together to make a variety of shapes.

If you want to build a really fast LEGO car, you have to know some simple Laws of Physics. Contrary to popular belief, placing weights on the car will not change the rate of acceleration. The best way to make your LEGO car speedy is decrease the friction and air resistance.

Race cars have a special aerodynamic design to decrease the drag force called “air resistance.
Race cars have a special aerodynamic design to decrease the drag force called “air resistance."

Push together two triangular LEGO pieces to build a pointy nose for your LEGO car. Decreasing the surface area of the front end reduces air resistance.

The arrow design decreases the drag force created by air.
The arrow design decreases the drag force created by air.

Attach the triangle shaped front end to the rectangular LEGO piece. The point is the front end and the rectangle is the back end of your car.

Press on small LEGO pieces to firmly connect the front and back end together. The design of your LEGO car should stay long and sleek.

The rubber treads on tires create friction against a surface.
The rubber treads on tires create friction against a surface.

Attach four hard plastic LEGO tires, not rubber tires, on each of the four ends using wheel connection LEGO pieces. Hard plastic LEGO tires create less friction than rubber LEGO tires. Friction is another force that can slow down your LEGO car.

Push car from the rear rectangular end over a smooth surface. The surface can be flat or angled like a ramp.

Things You Will Need

  • 2 triangle shaped LEGO pieces
  • 1 rectangular shaped LEGO piece
  • 4 plastic LEGO wheels
  • 4 wheel connection LEGO pieces
  • Various small LEGO pieces

Tip

Try an experiment with air resistance on your car. Under adult supervision, use a stop watch and compare the speed of the car when it must accelerate against the strong wind of a hair dryer. .

Warning

Small parts or use of electrical devices can be dangerous around very young children.

About the Author

In 2006 Kelly Harris began freelance writing for "Dancer Magazine," writing press releases for "The Dallas Post" and producing Web content, brochures and newsletters for various entertainment companies. Harris graduated from the New World School of the Arts and will receive her Bachelor of Arts in interdisciplinary studies from Boston University.