Defend your kingdom! Students try to build a catapult that can launch a cotton ball "boulder" at the enemy that is located exactly one foot away. Easy to find materials include Legos (or other materials, such as cardboard, tape, etc.), a ruler, and a cotton ball to build the catapults. Students test out their catapults and measure the distance the cotton ball lands from their catapult. When they think they have an accurate catapult, they can try it out against a Lego troll (or other figure that can act as the "attacker" of the kingdom)! This maker activity fits perfectly in a unit on simple machines because of the relationship between catapults and levers. Connect this lesson to social studies and language arts by reading information about the history of catapults (see other products I have listed for the Catapults Information sheet). This Catapult Challenge sheet can be cut along the black rectangle to fit easily in students' science notebooks!