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FORCE, MOTION & PRESSURE, CONTINUEDTrebuchet—Flinn STEM Design Challenge™Construct a trebuchet—the most powerful siege machine before gunpowder. With this smaller version, students master the variables that must be optimized in order to breach enemy walls. Students make use of an easily adjustable base to test how different heights, arm lengths, counterweights and release angles determine the flight distance of the projectile.AP8347 I $149.95Roller Coasters—Flinn STEM Design Challenge™Roller coasters provide opportunities for learn-ing about conservation of energy, acceleration, friction and engineering design. Students first determine how changing release height and ball mass affect the distance a ball travels on a straight track with a single rise. Students apply the findings and conservation of energy knowl-edge in designing a thrilling yet safe roller coaster with specific criteria, constraints and materials provided.AP8055 I $66.35Marble Down—Flinn STEM Design Challenge™This activity familiarizes students with engi-neering design. In the design process, students ask questions, define problems, plan, create, test, evaluate and more. First, students investigate variables to determine how each affects a marble’s speed along a rubber band track. Watch student engage-ment increase as they apply the concepts from the introductory activity to build a marble maze with the longest run time.AP8315 I $74.95Ballistics CarGive motion concepts visual meaning. Place a ball in a spring-loaded cylinder and set the car in motion on a smooth, level surface. Pull on the magnet to launch the ball in the air. As the car moves, the ball returns to the cylinder! Yields repeatable results. Analysis of independent horizontal and vertical motion leads to great follow-up discussions. Includes magnetic strip, steel ball, car, instructions and background information.AP4637 I $87.80Force and Motion—Super Value Laboratory KitExplore force and motion with five experiments on the topics of balanced and unbalanced forces on inclined planes, frictional forces, Hooke’s law, rotational motion and one-di-mensional collisions. With easy-to-set-up lab stations, students complete one activity then move on to the next. All can be completed in two class periods. Includes most materials, complete instructions, student worksheets, sample data and answers to all questions.AP6929 I $161.40