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How to Build Mousetrap Powered Cars

A mousetrap car uses the power of the trap's spring and a coiled up string to propel its rear axle. The rising trap arm pulls the string and propels the car forward. Various designs exist on how to make cars intended for distance and speed, but you can make a basic car with little preparation. Handle the mousetrap carefully and use lots of glue when building your car. Make your car out of either wood or foam.

Things You'll Need

  • Wooden mouse trap
  • String
  • Block of wood or foam for the car body
  • Sturdy craft foam
  • Four wheels (pre-made miniature car wheels, old CDs or any similar round object)
  • Two 6-inch axles (narrow metal rods)
  • Two straight plastic drinking straws
  • Four popsicle sticks
  • Utility knife
  • Hot glue gun and glue
  • Hacksaw
  • Pliers
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Instructions

    • 1

      Cut the car body slightly larger than the mousetrap, using a saw if the body is wood, or a utility knife if it is foam.

    • 2

      Attach the popsicle sticks to the bottom of the car body with hot glue. Place them at the front and back (narrower) sides of the body, two on each side. Glue each pair of sticks approximately 1 inch apart and parallel. Glue 2 inches of each popsicle to the bottom of the car body, with the ends sticking out. These ends hold the car's axles.

    • 3

      Make the front axle by sliding the small rod through a drinking straw. Use pliers to bend 1/2-inch at the end of each axle 90 degrees, so the axle has two parallel shorter ends facing directly up when laid flat on a table. Holding the straw-covered axle, glue the straw to the bottom of the popsicle sticks at the front of the car body. Center the straw on the popsicle sticks, making the axle parallel to the front of the car body.

    • 4

      Cut two 1 1/2-inch pieces from another drinking straw. Slide the pieces onto the second axle and bend the ends of the axle up 90 degrees as described in Step 3. Glue the straw pieces to the bottom of the rear popsicles, parallel to each other.

    • 5

      Glue small squares of craft foam to the center of the wheels. The size of the foam squares varies according to the size of your wheels. Glue the foam squares to the bent ends of the axles.

    • 6

      Glue the mousetrap to the top of the car body, with the unset arm of the trap pointing toward the front wheels. Tie one end of the string to the arm of the trap and secure it tightly; glue it in place if necessary. Wind the other end of the string around the rear axle in the opposite direction the car will roll. Set the trap, wrapping the remaining string. Release the trap and watch the car roll.


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