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Copyright Microsoft clip art DESTROY THE CASTLE A Model of a Trebuchet By J. Kalinowski (student) What is a trebuchet? • An Medieval war machine • A catapult that uses a counterweight for the applied force Copyright www.sca.org.n2/collegium/uni36/medieval_war.html 2002 The Challenge • Build a wooden trebuchet that will throw a hackysack at a wooden wall • The base of the trebuchet should be able to fit into a square that is 50 centimeters on each side • The wall will be placed 3 meters from the trebuchet Predictions • Using the equations for projectile motion the projectile should be released at a velocity of 3 meters per second at a height of 0.8 meters • The sling arm should be longer than the counterweight arm • The hackysack should be released in a horizontal direction EQUATIONS • • • • • Dx = vix t Dy = ½ (9.8 m/s2) t2 Torque = F (lever arm) Ideal mechanical advantage = effort arm/load arm Actual mechanical advantage = force out/force in The Design • The sling arm measured 0.8 meters • The sling measured 0.5 meters • The counter balance arm measured 0.4 meters • The maximum height was 0.75 meters The Diagram 40 cm 80 cm 75 cm 43 cm Actual picture • Picture or movie from digital camera Analysis of Trebuchet • The sling needed to be extended 10 cm to increase height and speed • We found that a counterweight of 1.2 kg gave us the best run • The base of the trebuchet should be increased to give more stability Works Cited • • • Burke, Dillion Shiel. “Trebuchet picture”. Posted 2001. Accessed 8 Sept 2002 < www.sca.org.n2/collegium/uni36/medieval_war.html>. Faughn, Jerry and Serway, Raymond, Physics, Holt 2002. Chapter 8 “Rotational Equilibrium and Dynamics”. Geiselman, Kevin A. “Trebuchet Construction Hints and Tips”. Ingenium – Ingenious Machines. Revised 27 May 2002. Accessed 25 August 2002 <http://www.tasigh.org/ingenium/hints.html>.