Will the weight of the projectile make a difference in how far it travels or how fast it falls to the ground? Try out other small objects to measure this. Playing with the catapult also provides an opportunity to observe gravity, kinetic energy, and potential energy. How can you see some of these laws in action with the catapult? They sure are! First recorded in ancient Greece around 399, B.C., catapults were used in battle to defeat walls and attack settlements, but in modern times we can use them for something else! Catapults are very useful in teaching STEM concepts, particularly Newton’s 3 Laws of Motion – An object at rest stays at rest unless acted upon by an outside force force is equal to the change in momentum per change in time, and for every action, there is an equal and opposite reaction. Try building the catapult with more popsicle sticks.What might make a difference in how far it travels? Measure the distance the pom pom traveled. Release the spoon to watch the pom pom launch! Where will the pom pom go? How far will it go? Hold the catapult with one hand and use your other hand to pull down on the spoon.The spoon should be facing cup side (scoop side) outwards.Set the spoon on the top popsicle stick and use a rubber band to lash it down.Attach the larger stack to the stick on the top using a rubber band.Pull the two popsicle sticks slightly apart and place the larger stack of sticks in between the two.Wrap one rubber band around one end of these two sticks to hold them together. Take two popsicle sticks and stack them together.Wrap a rubber band around each end of the stack to hold the stack together. ![]() Optional: paint or color the popsicle sticks before starting. ![]()
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