For Kids

Science Experiment: Potential and Kinetic Energy - Marshmallow Catapult


Break the Seige Make Your Own Catapults

Every object on earth has potential energy. That means it COULD move even if it isn't right now. When an object IS moving it has kinetic energy.

In today's demonstration you are going to store energy in a spring. That spring will have the potential to move, but it won't move until you let it move. The catapult you make is going to transfer energy from the spring to a marshmallow. The marshmallow will have potential energy until the catapult releases, then the marshmallow will have kinetic energy as it flies through the air.

You Will Need:

  • Kleenex Box & 2 pencils OR 10 popsicle or craft sticks
  • Rubber Bands
  • Milk Jug Cap

Websites that will give you good directions:

Websites, Activities & Printables:

Science in ContextScience in Context: Potential and Kinetic Energy is a database you can use in any IndyPL Library Branch or at homey. Login using your IndyPL library card number. The Science in Context database will show you articles, images and videos to help you learn about potential and kinetic energy.


You can also ask a math and science expert for homework help by calling the Ask Rose Homework Hotline. They provide FREE math and science homework help to Indiana students in grades 6-12.


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