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.
Watch NASA astronaut Joe Acaba demonstrate kinetic and potential energy on the International Space Station by showing how an object’s potential energy changes.
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Twenty devious weapons of backyard warfare. Each of these launchers are made from PVC, soda bottles, rubber bands, hairspray cans, and anything you might find in the junk drawer, and are capable of firing marshmallows, poker chips, tennis balls, sponges, and plenty more.
Instructions and drawings for building ten model catapults.
Use things around the house or out of the recycle bin to design and build 30 different projects.