How to Build Fast LEGO Cars

Written by kelly harris
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How to Build Fast LEGO Cars
LEGO pieces can be stacked together to make a variety of shapes. (lego 1 image by Nathalie P from

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.

Skill level:

Things you need

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

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  1. 1

    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.

    How to Build Fast LEGO Cars
    Race cars have a special aerodynamic design to decrease the drag force called "air resistance." (fast car 2 image by chrisharvey from
  2. 2

    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.

    How to Build Fast LEGO Cars
    The arrow design decreases the drag force created by air. (arrow image by cherie from
  3. 3

    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.

  4. 4

    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.

    How to Build Fast LEGO Cars
    The rubber treads on tires create friction against a surface. (line of tires image by ashotoflife from
  5. 5

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

Tips and warnings

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

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