We made three – yes three! – awesome STEM-inspired Halloween decorations in this video! To make bouncing pumpkins, where we transform an ordinary piece of construction paper into a bouncing Halloween toy, view the video from 0:14-1:42.

This super fun activity explores physical change, i.e. a change where no new substance is formed. Physical changes affect the form of a substance, but not what it’s made up of. Some physical changes are reversible and mass does not change. An example is a change in shape!

Ready to make this project at home or in your classroom? Watch the video for an overview, gather the materials listed at the right, and follow the instructions below!

Required Materials

  • construction paper
  • ruler
  • scissors
  • glue
  • marker (optional)

Step-By-Step Instructions

Step 1

Measure and cut a standard piece of construction paper into four strips measuring one inch in width or six strips measuring 1/2 inches wide. You can measure the width horizontally or vertically – it’s up to you!

Step 2

Glue two strips of the construction paper into an “X” shape.  Do this twice. You will have two “X”s.

Step 3

Glue the two “X” shapes together, one on top of the other, to create a shape resembling a star.

Step 4

Glue the top of the opposite ends of each strip together to create a sphere-like shape.

Step 5

Decorate as desired with additional construction paper (you can add a stem!) or makers. Wait for all of the glue to completely dry.

Step 6

Once dry, apply pressure to the center of the sphere and release. Your pumpkin should bounce up from the table!