This Design & Build challenge provides opportunities for students to predict how a given force affects the distance travelled by an object, as well as compare how forces of different magnitudes result in different distances travelled by propelled objected. In these types of devices, force is transferred through a mechanical system to propel an object such as a rock (or pumpkin) up, up and away! Catapults include the mangonel (fulcrum pivots at one end and the force is applied by applying tension to the fulcrum) and the trebuchet (fulcrum pivots at its centre and the force is applied by a counterweight located at the end of the fulcrum). In ancient times, people developed devices called catapults to solve this problem. This frequently involved using some sort of device to propel the object up into the air and over the obstacle. Throughout history, humans have sought to find ways to get objects over obstacles. It is highly recommended that students have prior knowledge and skills related to the use of simple machines before participating in this Design & Build challenge. To successfully participate in this Design & Build lesson, students should be able to use basic cutting tools and fasteners for construction. Students will create and test a device which uses simple machines to launch a ping-pong ball as far as possible or up and over an obstacle.Ĥ5-60 minutes Setting the Stage Prior Skills and Knowledge
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