MECH 210 Study Guide - Midterm Guide: Siege Engine, Order Of Merit

• School: McGill University
• Department: Mechanical Engineering
• Course: MECH 210
• Professor: Christa Scholtz

Document Summary

Problem 1: 5 points: 10 lb forces are applied at points c and d of a simple snip, as shown right. Compute the compressive force at point a: now consider the compound snip shown on the right. Determine the forces in truss members 1 through 7. Correct free body diagrams are worth between 20% and 30% of the grade for each problem. This type of catapult was used in antiquity as a siege weapon. A twisted bundle of ropes served as torsional spring to throw stones: the catapult is loaded with a 25 kg rock, as shown below. The spring exerts a 20kn. m moment at point o, and a rope prevents the release at point a. Determine the tension t in the rope, and the shear and moment diagrams in the catapult arm: after the shot, the catapult arm rests against the cushion.