PHYS 1080 Lecture Notes - Lecture 4: Rove Beetle, Free Body Diagram, Soldier Beetle

• School: University of Guelph
• Department: Physics
• Course: PHYS 1080
• Professor: Stefan Kycia

Document Summary

Three beatles, each with a mass of 4 g, are positioned at different radii (5, 10, 15 cm) on a vinyl disc placed on an old record player. The record player spins with a constant angular speed of 33 rpm. The coefficient of static friction between each beatle and the disc is 0. 1. Rove beetle: step 1: draw the free body diagram for a beatle at equilibrium on the disc, step 2: apply newton"s second law. N fs r amf = r r mg amf = s r ar. 3: step 3: consider appropriate limits, to stay in their circular path, they require a centripetal force equal to mr 2. (here, that"s the friction force) If the force is less than this, they"ll slip slip if. 2 rmf s < (3: notice that the larger the circular path (r), the greater the force required: what is r.