How to Build a Mousetrap Car

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Making a mousetrap car is a fun way to experiment with materials around the house while learning about physics.

Things You'll Need

  • Mousetraps
  • Toy car wheels
  • Nails
  • Hammer
  • Straight edge
  • Tongue depressors or Popsicle sticks
  • Wood glue
  • Clothespins or clamps
  • Scrap wood blocks (1 inch x 1 inch x 1/4 inch)
  • Power drill and assorted bits
  • Wood dowel
  • Handsaw
  • Utility knife
  • Milk jug lids
  • CDs or plastic CD toppers
  • Rubber bands
  • Hot glue and glue gun
  • Fishing line
  • Pliers
Mousetrap race car
Mousetrap race car (Image: Megan Andersen)

Step 1

Use a nail to press a hole in each side of the mousetrap. (These holes act as guides and help keep the wood from splitting.) Nail the toy wheels to the sides of the mousetrap at the front of the trap. Leave a little space between the trap and the wheel when you hammer in the nail, so the wheels can rotate freely.

Making pilot holes for the nails.
Making pilot holes for the nails. (Image: Megan Andersen)

Step 2

Draw two Xs on the 1-inch wood blocks, using a pencil and straight edge. At the intersection of each X, drill a hole slightly larger than the wood dowel.

Center drilled holes
Center drilled holes (Image: Megan Andersen)

Step 3

Glue two Popsicle sticks to the bottom of the mousetrap, aligned with the sides of the mousetrap and extending from the end opposite the wheels. Glue the wood blocks on top of the Popsicle sticks. Hold the Popsicle sticks in place while they dry, using either clamps or clothespins. Allow the glue to cure completely (about 6 hours).

Let the wood glue dry completely.
Let the wood glue dry completely. (Image: Megan Andersen)

Step 4

Cut a length of wood dowel about 3 inches longer than the width of the mousetrap. Carve a small notch in the center of the dowel.

Carving the dowel.
Carving the dowel. (Image: Megan Andersen)

Step 5

Slide the wood dowel through the holes in the wood blocks. Drill a hole in the center of the milk jug lids, then slip the CD toppers and milk jug lids onto the dowel. Wrap rubber bands around the dowels to secure the assembly.

Create the back wheels.
Create the back wheels. (Image: Megan Andersen)

Step 6

Apply a generous amount of hot glue inside the milk jug lid and around the rubber band. This will secure the "wheel" to the "axle." Be careful not to glue the CD topper to the wood blocks. You want these "back wheels" to spin freely.

Hot glue the rubber bands in place.
Hot glue the rubber bands in place. (Image: Megan Andersen)

Step 7

Check to make sure both wheels spin freely. Pry away any stray glue, if necessary. Cut a piece of fishing line about 6 inches long and tie one end to the metal bar of the mousetrap.

View of the axle.
View of the axle. (Image: Megan Andersen)

Step 8

Pull the trap bar back toward the back wheels, and wrap the fishing line around the center of the axle and the notch. Gently place the car on a hardwood or linoleum floor, and release your hand from the trap. The car should propel forward and roll for several feet.

Set the trap and watch the car roll.
Set the trap and watch the car roll. (Image: Megan Andersen)

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