![]() The spoon will serve as a launching platform. Place a plastic spoon on the open end of the craft stick and rubber band the spoon to the craft stick to secure it.Slide the stack down toward the bottom as close to the rubber band in step 2 as possible without breaking.Twist another rubber band in a cross to hold the catapult together.This will create a fulcrum (pivoting point) that will allow us to shoot the marshmallow. Build a lever by opening the two craft sticks from the opposite end of the rubber band and slide the stack of five to eight craft sticks between the two sticks.Make sure that it is wrapped very tightly. Stack two craft sticks together and wrap a rubber band around only one end.Stack five craft sticks together and tightly twist a rubber band around each end.Lawn, Gardening & Pests Learning Activities.Gravity pulls the heart back toward the ground, giving the candy its trajectory, or path. When the arm stops, the heart projectile continues to move forward due to Newton’s first law, which states that an object in motion, stays in motion. When you place an object like the conversation heart in the bucket, the heart moves at the same speed as the arm and the bucket. ![]() When you release the arm of the catapult, the elastic energy is converts into kinetic energy – the energy of motion. Therefore, tension builds and energy is stored.Įnergy that is stored when a material is compressed (think of a spring) or stretched (a slingshot) is called elastic energy. ![]() In the catapult, you press down on the arm. The catapult is an example of a lever type simple machine in which a beam or arm pivots at a fixed point called the fulcrum. The popsicle stick catapult is a simple machine – a mechanical device used to change the direction or magnitude of a force. Testing the effect of one change at a time, he moved the bundle of sticks closer to the launching pad, loosened the rubber band on the hinged sticks, and experimented with pressing harder and softer on the launching pad.Īs a result, every tweak he made created a noticeable change in the launch! The Science Behind It As a result, the heart went flying!Īfter a few rounds, he decided to experiment with his catapult a little bit to see what design changes would affect the height and distance of the conversation hearts. He held one end of the base with one hand, and pressed firmly down on the launching pad with his other hand. With a big nod of agreement, Middle Brother eagerly placed his first conversation heart in the launching pad.
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