Rube Goldberg Design Ryan Hodges Tom Singleton Travis Vaughn Michael Ewing

 1” PVC pipe  Three 45 g steel balls, One 67 g steel ball  Funnel  Plastic cup, Bottom of Plastic Bottel  2 pulleys and string  Wood  Mousetrap  Dominos  Ipod and speaker

Step One Conservation Of Energy ½ mv 2 + mgh = ½ mv mgh 2 Mass – 45 g PVC pipe

Step Two Projectile Motion y – y o = (x – x 0 ) tan - 2/gv o 2 (1 + tan 2 )(x – x 0 ) 2 Torque τ = r x F Plastic Cup, Funnel, Pulley with string

Step Three Center Of Mass M 1 R 1 + M 2 R 2… M n R n …….M 1 + M 2... M n 67 g piece of wood One 67 g steel ball One 45 g steel ball

Step Four Torque τ = r x F Conservation of energy ½ mv 2 + mgh = ½ mv mgh 2 Bottom of plastic bottle, pulley, PVC pipe

Step Five Elastic Collisions M 1 V 1 + M 2 V 2 = M 1 V 1 ’ + M 2 V 2 ’ V 1 – V 2 = -(V 1 ’ – V 2 ’) Dominos

Step Six Force of Mousetrap Hooke’s Law F = kx Unplugs Ipod turning off song